回折データは、東南地域共同アクセス (SER 猫) チーム 22 ID および 22 BM ビームラインの高度な光子ソース (AP)、アルゴンヌ国立研究所で収集されました。SIBYLS ビームライン事前光ソース (ALS)、ローレンス ・ バークレー国立研究所での小角 x 線散乱データを収集しました。リモート データの収集と処理の SIBYLS ビームラインでのスタッフに感謝したいと思います。タンパク質ドメインの境界を決定する助けのための環境健康科学の国立研究所 (NIEHS) 質量分析法による研究およびサポート グループに感謝しております。この作品によって、米国国立研究所の健康学内研究プログラムをサポートされていました米国立環境健康科学 (NIEHS) 研究所 (r. e. s. に ZIA ES103247) とカナダ保健研究 (機構、M.C.P に 146626) 機構。AP の使用は、米国エネルギー省、科学局、契約番号の下で基本的なエネルギー科学のオフィスによって支えられました。W-31-109-Eng-38。高度な照明のソース (ALS) の使用はディレクター、科学局、事務所のエネルギーの基礎科学、契約番号の下で米国エネルギー省によって支えられました。デ-AC02-05CH11231。追加サポート SIBYLS 小角 x 線散乱ビームラインは、国立衛生研究所からなるプロジェクト ミノス (R01GM105404) とハイエンド計装グラント S10OD018483。我々 もこの原稿の彼らの重要な読書のアンドレア ・月と博士サラ アンドレスに感謝したいと思います。

著者が明らかに何もありません。

このプロトコルを使用すると、酵母から組換え Nsa1 は、x 線回折・小角 x 線散乱による構造研究に対して生成されました。Nsa1 は、ソリューションの行儀と複数の結晶形に結晶化されました。これらの結晶の最適化、中に Nsa1 の C 末端がプロテアーゼ分解に敏感であったことが発見されました。高解像度 Nsa1 の柔軟な C 末端が結晶の充填を妨げるために、斜方晶系の結晶形を Nsa1、可能?...

リボソームは、mRNA にすべての生きている細胞の蛋白質翻訳の重要な役割を果す大きいリボ核蛋白質マシンです。リボソームはリボソーム生合成1,2,3,4と呼ばれる複雑なプロセスで作り出される 2 つのサブユニットで構成されます。真核生物のリボソームの組み立ては不可欠なリボソーム アセンブリ要因2,3、5の何百もの援助に依存しています。Nsa1 (Nop7 には 1 が関連付けられている)、リボソーム大サブユニット6, の生産のために特に必要がある真核生物のリボソーム アセンブリ要因であり、WD リピートとして知られているを含む 74 (WDR74) より高い有機体7で。マウス8で胚盤胞の形成のため必要となる WDR74 が示されているし、WDR74 プロモーターよく癌細胞9で変異します。ただし、関数とリボソームの組み立ての Nsa1/WDR74 の正確なメカニズムはまだ主として知られています。まず真核生物のリボソーム成熟中に Nsa1/WDR74 の役割を明らかにするため、x 線回折・小角 x 線散乱法 (SAXS)10をなど複数の構造解析は実行されました。
X 線結晶構造解析や核磁気共鳴 (NMR) 分光法、電子顕微鏡、小角 x 線散乱は、高分子の構造を勉強してすべての重要な手法です。サイズ、形状、可用性、および安定性に適した特定の高分子が最高になる構造生物学方式高分子の影響を受けて、しかしいわゆる「ハイブリッド」アプローチを通じて複数のテクニックを組み合わせることになっている、ますます有益なツール11。特に x 線回折・小角 x 線散乱は、高分子12の構造決定のための強力かつ相補的な方法です。
結晶学小分子から、リボソームなど大規模な細胞機械装置に至るまで高解像度の原子構造を提供し、蛋白質等の生体機能の理解に多くの進歩をもたらした高分子13。さらに、構造ベース創薬の発見と開発の14に重要なディメンションを追加する計算の方法によって分子ドッキングの結晶構造のパワーを活用します。柔軟で乱れたシステムにもかかわらず、広範な応用結晶学結晶の充填が妨害されたり、電子密度マップを完了できない場合がありますので、質の悪いを評価するために挑戦しています。逆に、小角 x 線散乱、ソリューション ベースと低解像度構造アプローチ天然変性タンパク質12,,1516乱れたループ テルミニからまで柔軟なシステムを記述することが可能です。粒子サイズ12の広い範囲と互換性がある考慮した、小角 x 線散乱は結晶構造の研究で対処することができます生物の質問の範囲を拡大すると相乗的に働くことができます。
続いて、機能ですが柔軟な C 末端は x 線結晶構造解析法に従う well-structured WD40 ドメインが含まれているために、Nsa1 はハイブリッド構造的アプローチに適しています。次に、クローニング、表現、およびハイブリッド x 線結晶構造解析により構造決定の出芽酵母Nsa1 ・小角 x 線散乱の浄化のためのプロトコル。このプロトコルは、秩序・無秩序領域の組み合わせで構成されていますが他の蛋白質の構造を勉強する合わせることができます。

<table><tbody><tr><td>&lt;strong&gt;Molecular Cloning of Nsa1&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>pMBP2 parallel vector</td><td>Sheffield et al, Protein Expression and Purification 15, 34-39 (1999)</td><td></td><td>We used a modified version of pMBP2 which included an N-terminal His-tag (pHMBP)</td></tr><tr><td>S. cerevisiae genomic DNA</td><td>ATCC</td><td>204508D-5</td><td></td></tr><tr><td>&lt;strong&gt;Primers for cloning Nsa1&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>SC_Nsa1_FLFw</td><td>IDT</td><td></td><td>CGC CAA AGG CCT&lt;br/&gt; ATGAGGTTACTAGTCAGCTGTGT&lt;br/&gt; GGATAG</td></tr><tr><td>SC_Nsa1_FLRv</td><td>IDT</td><td></td><td>AATGCAGCGGCCGCTCAAATTTT&lt;br/&gt; GCTTTTCTTACTGGCTTTAGAAGC&lt;br/&gt; AGC</td></tr><tr><td>SC_Nsa1_DeltaCFw</td><td>IDT</td><td></td><td>GGGCGCCATGGGATCCATGAGG&lt;br/&gt; TTACTAGTCAGCTGTGTGG</td></tr><tr><td>SC_Nsa1_DeltaCRv</td><td>IDT</td><td></td><td>GATTCGAAAGCGGCCGCTTAAAC&lt;br/&gt; CTTCCTTTTTTGCTTCCC</td></tr><tr><td>&lt;strong&gt;Recombinant Protein Production and Purification of Nsa1&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>Escherichia coli BL21 (DE3) Star Cells</td><td>Invitrogen</td><td>C601003</td><td></td></tr><tr><td>pMBP- NSA1 and various truncations</td><td>Lo et al., 2017</td><td></td><td></td></tr><tr><td>Selenomethionine</td><td>Molecular Dimensions</td><td>MD12-503B</td><td></td></tr><tr><td>IPTG, Dioxane-Free</td><td>Promega</td><td>V3953</td><td></td></tr><tr><td>EDTA Free Protease Inhibitor Cocktail</td><td>Sigma-Aldrich</td><td>4693159001</td><td></td></tr><tr><td>Sodium Chloride</td><td>Caledon Laboratory Chemicals</td><td>7560-1-80</td><td></td></tr><tr><td>Magnesium Chloride hexahydrate</td><td>Sigma-Aldrich</td><td>M2670</td><td></td></tr><tr><td>Tris Buffer, 1 M pH7.5</td><td>KD Medical</td><td>RGF-3340</td><td></td></tr><tr><td>Glycerol</td><td>Invitrogen</td><td>15514-029</td><td></td></tr><tr><td>beta-mercaptoethanol</td><td>Sigma</td><td>M6250</td><td></td></tr><tr><td>1M Imidazole, pH 8.0</td><td>Teknova</td><td>I6980-06</td><td></td></tr><tr><td>Talon Affinity Resin</td><td>Clonetech</td><td>635503</td><td></td></tr><tr><td>Amicon Ultra 15 mL Centrifugal Filter (MWCO 10K)</td><td>Millipore</td><td>UFC901024</td><td></td></tr><tr><td>HiLoad 16/600 Superdex 200 Prep Grade Gel Filtration Column</td><td>GE-Healthcare</td><td>28989335</td><td></td></tr><tr><td>TEV Protease</td><td>Prepared by NIEHS Protein Expression Core</td><td>Expression plasmid provided by NCI (Tropea et al. Methods Mol Biology, 2009)</td><td></td></tr><tr><td>4-15% Mini-PROTEAN TGX Precast Protein Gels</td><td>BioRad</td><td>456-8056</td><td></td></tr><tr><td>&lt;strong&gt;Crystallization, Proteolytic Screening&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>Crystal Screen</td><td>Hampton Research</td><td>HR2-110</td><td></td></tr><tr><td>Crystal Screen 2</td><td>Hampton Research</td><td>HR2-112</td><td></td></tr><tr><td>Salt Rx</td><td>Hampton Research</td><td>HR2-136</td><td></td></tr><tr><td>Index Screen</td><td>Hampton Research</td><td>HR2-144</td><td></td></tr><tr><td>PEG/Ion Screen</td><td>Hampton Research</td><td>HR2-139</td><td></td></tr><tr><td>JCSG+</td><td>Molecular Dimensions</td><td>MD1-37</td><td></td></tr><tr><td>Wizard Precipitant Synergy</td><td>Molecular Dimensions</td><td>MD15-PS-T</td><td></td></tr><tr><td>Swissci 96-well 3-drop UVP sitting drop plates</td><td>TTP Labtech</td><td>4150-05823</td><td></td></tr><tr><td>3inch Wide Crystal Clear Sealing Tape</td><td>Hampton Research</td><td>HR4-506</td><td></td></tr><tr><td>Proti-Ace Kit</td><td>Hampton Research</td><td>HR2-429</td><td></td></tr><tr><td>PEG 1500</td><td>Molecular Dimensions</td><td>MD2-100-6</td><td></td></tr><tr><td>PEG 400</td><td>Molecular Dimensions</td><td>MD2-100-3</td><td></td></tr><tr><td>HEPES/sodium hydroxide pH 7.5</td><td>Molecular Dimensions</td><td>MD2-011-</td><td></td></tr><tr><td>Sodium Citrate tribasic</td><td>Molecular Dimensions</td><td>MD2-100-127</td><td></td></tr><tr><td>22 mm x 0.22 mm Siliconized Coverslides</td><td>Hampton Research</td><td>HR3-231</td><td></td></tr><tr><td>24 Well Plates with sealant (VDX Plate with Sealant)</td><td>Hampton Research</td><td>HR3-172</td><td></td></tr><tr><td>18 mM Mounted Nylon Loops (0.05 mm to 0.5 mM)</td><td>Hampton Research</td><td>HR4-945, HR4-947, HR4-970, HR4-971</td><td></td></tr><tr><td>Seed Bead Kit</td><td>Hampton Research</td><td>HR2-320</td><td></td></tr><tr><td>Magnetic Crystal Caps</td><td>Hampton Research</td><td>HR4-779</td><td></td></tr><tr><td>Magnetic Cryo Wand</td><td>Hampton Research</td><td>HR4-729</td><td></td></tr><tr><td>Cryogenic Foam Dewar</td><td>Hampton Research</td><td>HR4-673</td><td></td></tr><tr><td>Crystal Puck System</td><td>MiTeGen</td><td>M-CP-111-021</td><td></td></tr><tr><td>Full Skirt 96 well Clear Plate</td><td>VWR</td><td>10011-228</td><td></td></tr><tr><td>AxyMat Sealing Mat</td><td>VWR</td><td>10011-130</td><td></td></tr><tr><td>&lt;strong&gt;Equipment&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>UVEX-m</td><td>JAN Scientific, Inc.</td><td></td><td></td></tr><tr><td>Nanodrop Lite Spectrophotometer</td><td>Thermo-Fisher</td><td></td><td></td></tr><tr><td>Mosquito Robot</td><td>TTP Labtech</td><td></td><td></td></tr><tr><td>&lt;strong&gt;Software/Websites&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>HKL2000</td><td>Otwinoski and Minor, 1997</td><td></td><td></td></tr><tr><td>Phenix</td><td>Adams et al., 2010</td><td></td><td></td></tr><tr><td>Coot</td><td>Emsley et al., 2010</td><td></td><td></td></tr><tr><td>ATSAS</td><td>Petoukhov et al., 2012</td><td></td><td>https://www.embl-hamburg.de/biosaxs/atsas-online/</td></tr><tr><td>Scatter</td><td>Rambo and Tainer, 2013</td><td></td><td></td></tr><tr><td>Pymol</td><td>The PyMOL Molecular Graphics System, Version 1.8 Schr&amp;ouml;dinger, LLC.</td><td></td><td></td></tr><tr><td>BUNCH</td><td>Petoukhov and Svergun, 2005</td><td></td><td></td></tr><tr><td>CRYSOL</td><td>Svergun et al, 1995</td><td></td><td></td></tr><tr><td>PRIMUS</td><td>Konarev et al, 2003</td><td></td><td></td></tr><tr><td>EOM</td><td>Tria et al, 2015</td><td></td><td></td></tr></tbody></table>

combining x-ray crystallography with small angle x-ray scattering to model unstructured regions of nsa1 from s. cerevisiae

リボソーム アセンブリ因子 Nsa1酵母 (出芽酵母)からのフルレングスの構造の決定は、乱れたため挑戦とプロテアーゼ活性タンパク質の C 末端。本稿では、x 線回折・小角 x 線散乱による構造解析出芽酵母から遺伝子組換え Nsa1 を浄化する方法について説明します。Nsa1 のよく整理された N 末端 WD40 ドメインの構造を解決するために x 線結晶解析を用いて、小角 x 線散乱ソリューションの Nsa1 の C 末端の構造を解決する使用だった。散乱データのソリューションは、ソリューションでフルレングスの Nsa1 から採取しました。WD40 ドメインの高分解能結晶構造から算出した理論の散乱振幅と剛体と第一原理計算モデリングの組み合わせが Nsa1 の C 末端を明らかにし。このハイブリッド アプローチを通じて、全体蛋白質の第四紀構造が再建されました。紹介した方法は、他の蛋白質の構造化および非構造化ドメインのミックスの作曲のハイブリッド構造決定の一般的に適用される必要があります。

Nsa1 は、出芽酵母ゲノム DNA の増幅と subcloned MBP と TEV プロテアーゼ サイト続いて N ターミナル 6 x ヒスチジン親和性タグを含むベクトルに PCR をだった。Nsa1 は大腸菌BL21(DE3) 細胞に変換され、IPTG 誘導および 25 ° c 一晩 (図 1 a) 成長タンパク質発現の高収率が得られました。Nsa1 は、固定化コバルト親和性樹脂、TEV プロテアーゼと MBP...

Watch this Scientific Journal Video about Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae at JoVE.com

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

このメソッド小角 x 線散乱 (SAXS) x 線結晶構造解析によってクローニング、表現、および構造決定のための組換え Nsa1 の精製をについて説明し、他のタンパク質のハイブリッド構造解析の適用両方を含む注文し、無秩序なドメイン。

S. 酵母から Nsa1 の非構造化領域をモデル化する x 線小角散乱と x 線結晶解析を組み合わせること

Determination of the full-length structure of ribosome assembly factor Nsa1 from Saccharomyces cerevisiae (S. cerevisiae) is challenging because of the ...

combining-x-ray-crystallography-with-small-angle-x-ray-scattering-to

Universidad de Cartagena UDEC

Research

JoVE Journal

Biochemistry

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

9.8K ビュー.  National Institutes of Health. このメソッド小角 x 線散乱 (SAXS) x 線結晶構造解析によってクローニング、表現、および構造決定のための組換え Nsa1 の精製をについて説明し、他のタンパク質のハイブリッド構造解析の適用両方を含む注文し、無秩序なドメイン。

ビデオ: Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

Biological small angle X-ray scattering (BioSAXS) is a powerful technique in molecular and structural biology used to determine solution structure, particle size and shape, and surface-to-volume ratio of macromolecules. The technique is applicable to a very wide variety of solution conditions spanning a broad range of concentrations, pH values, ionic strengths, temperatures, additives, etc., but the sample is required to be monodisperse. This caveat led to the implementation of liquid chromatography systems on SAXS beamlines. Here, we describe the upstream integration of size-exclusion (SEC) and ion-exchange chromatography (IEC) on a beamline, different methods for optimal background subtraction, and data reduction. As an example, we describe how we use SEC- and IEC-SAXS on a fragment of the essential vaccinia virus protein D5, consisting of a D5N helicase domain. We determine its overall shape and molecular weight, showing the hexameric structure of the protein.

The determination of the solution structure of a protein by small angle X-ray scattering (SAXS) requires monodisperse samples. Here, we present two possibilities to ensure minimal delays between sample preparation and data acquisition: online size-exclusion chromatography (SEC) and online ion-exchange chromatography (IEC).

SAXSビームライン上のオンラインサイズ排除およびイオン交換クロマトグラフィー

Biological small angle X-ray scattering (BioSAXS) is a powerful technique in molecular and structural biology used to determine solution structure, ...

生化学

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Supramolecular protein assemblies play fundamental roles in biological processes ranging from host-pathogen interaction, viral infection to the propagation of neurodegenerative disorders. Such assemblies consist in multiple protein subunits organized in a non-covalent way to form large macromolecular objects that can execute a variety of cellular functions or cause detrimental consequences. Atomic insights into the assembly mechanisms and the functioning of those macromolecular assemblies remain often scarce since their inherent insolubility and non-crystallinity often drastically reduces the quality of the data obtained from most techniques used in structural biology, such as X-ray crystallography and solution Nuclear Magnetic Resonance (NMR). We here present magic-angle spinning solid-state NMR spectroscopy (SSNMR) as a powerful method to investigate structures of macromolecular assemblies at atomic resolution. SSNMR can reveal atomic details on the assembled complex without size and solubility limitations. The protocol presented here describes the essential steps from the production of 13C/15N isotope-labeled macromolecular protein assemblies to the acquisition of standard SSNMR spectra and their analysis and interpretation. As an example, we show the pipeline of a SSNMR structural analysis of a filamentous protein assembly.

Structures of supramolecular protein assemblies at atomic resolution are of high relevance because of their crucial roles in a variety of biological phenomena. Herein, we present a protocol to perform high-resolution structural studies on insoluble and non-crystalline macromolecular protein assemblies by magic-angle spinning solid-state nuclear magnetic resonance spectroscopy (MAS SSNMR).

固体核磁気共鳴分光法による高分子アセンブリの原子スケール構造の研究

Supramolecular protein assemblies play fundamental roles in biological processes ranging from host-pathogen interaction, viral infection to the ...

Microcrystallography of Protein Crystals and In Cellulo Diffraction

The advent of high-quality microfocus beamlines at many synchrotron facilities has permitted the routine analysis of crystals smaller than 10 &#181;m in their largest dimension, which used to represent a challenge. We present two alternative workflows for the structure determination of protein microcrystals by X-ray crystallography with a particular focus on crystals grown in vivo. The microcrystals are either extracted from cells by sonication and purified by differential centrifugation, or analyzed in cellulo after cell sorting by flow cytometry of crystal-containing cells. Optionally, purified crystals or crystal-containing cells are soaked in heavy atom solutions for experimental phasing. These samples are then prepared for diffraction experiments in a similar way by application onto a micromesh support and flash cooling in liquid nitrogen. We briefly describe and compare serial diffraction experiments of isolated microcrystals and crystal-containing cells using a microfocus synchrotron beamline to produce datasets suitable for phasing, model building and refinement.
These workflows are exemplified with crystals of the Bombyx mori cypovirus 1 (BmCPV1) polyhedrin produced by infection of insect cells with a recombinant baculovirus. In this case study, in cellulo analysis is more efficient than analysis of purified crystals and yields a structure in ~8 days from expression to refinement.

Microcrystallography of Protein Crystals and In Cellulo Diffraction

A protocol is presented for X-ray crystallography using protein microcrystals. Two examples analyzing in vivo-grown microcrystals after purification or in cellulo are compared.

タンパク質結晶の微結晶化および<em&gt;セルロで</em&gt;回折

The advent of high-quality microfocus beamlines at many synchrotron facilities has permitted the routine analysis of crystals smaller than 10 &#181;m in ...

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Development of new antimicrobials and vaccines for Streptococcus pneumoniae (pneumococcus) are necessary to halt the rapid rise in multiple resistant strains. Carbohydrate substrate binding proteins (SBPs) represent viable targets for the development of protein-based vaccines and new antimicrobials because of their extracellular localization and the centrality of carbohydrate import for pneumococcal metabolism, respectively. Described here is a rationalized integrated protocol to carry out a comprehensive characterization of SP0092, which can be extended to other carbohydrate SBPs from the pneumococcus and other bacteria. This procedure can aid the structure-based design of inhibitors for this class of proteins. Presented in the first part of this manuscript are protocols for biochemical analysis by thermal shift assay, multi angle light scattering (MALS), and size exclusion chromatography (SEC), which optimize the stability and homogeneity of the sample directed to crystallization trials and so enhance the probability of success. The second part of this procedure describes the characterization of the SBP crystals using a tunable wavelength anomalous diffraction synchrotron beamline, and data collection protocols for measuring data that can be used to resolve the crystallized protein structure.

A streamlined protocol for performing an extensive biochemical and structural characterization of a carbohydrate substrate binding protein from Streptococcus pneumoniae is presented.

炭水化物輸送基質結合タンパク質 SP0092 の生化学的および構造特性

Development of new antimicrobials and vaccines for Streptococcus pneumoniae (pneumococcus) are necessary to halt the rapid rise in multiple resistant ...

Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution

In this paper, Small and Wide Angle X-ray Scattering (SWAXS) analysis of macromolecules is demonstrated through experimentation. SWAXS is a technique where X-rays are elastically scattered by an inhomogeneous sample in the nm-range at small angles (typically 0.1 - 5&deg;) and wide angles (typically &gt; 5&deg;). This technique provides information about the shape, size, and distribution of macromolecules, characteristic distances of partially ordered materials, pore sizes, and surface-to-volume ratio. Small Angle X-ray Scattering (SAXS) is capable of delivering structural information of macromolecules between 1 and 200 nm, whereas Wide Angle X-ray Scattering (WAXS) can resolve even smaller Bragg spacing of samples between 0.33 nm and 0.49 nm based on the specific system setup and detector. The spacing is determined from Bragg's law and is dependent on the wavelength and incident angle.
In a SWAXS experiment, the materials can be solid or liquid and may contain solid, liquid or gaseous domains (so-called particles) of the same or another material in any combination. SWAXS applications are very broad and include colloids of all types: metals, composites, cement, oil, polymers, plastics, proteins, foods, and pharmaceuticals. For solid samples, the thickness is limited to approximately 5 mm.
Usage of a lab-based SWAXS instrument is detailed in this paper. With the available software (e.g., GNOM-ATSAS 2.3 package by D. Svergun EMBL-Hamburg and EasySWAXS software) for the SWAXS system, an experiment can be conducted to determine certain parameters of interest for the given sample. One example of a biological macromolecule experiment is the analysis of 2 wt% lysozyme in a water-based aqueous buffer which can be chosen and prepared through numerous methods. The preparation of the sample follows the guidelines below in the Preparation of the Sample section. Through SWAXS experimentation, important structural parameters of lysozyme, e.g. the radius of gyration, can be analyzed.

The demonstration of the small and wide angle X-ray scattering (SWAXS) procedure has become instrumental in the study of biological macromolecules. Through the use of the instrumentation and procedures of specific angle methods and preparation, the experimental data from the SWAXS displays the atomic and nano-scale characterization of macromolecules.

溶液中の生体高分子の小型·広角X線散乱による研究

In this paper, Small and Wide Angle X-ray Scattering (SWAXS) analysis of macromolecules is demonstrated through experimentation. SWAXS is a technique ...

生物工学

Contrast-Matching Detergent in Small-Angle Neutron Scattering Experiments for Membrane Protein Structural Analysis and Ab Initio Modeling

The biological small-angle neutron scattering instrument at the High-Flux Isotope Reactor of Oak Ridge National Laboratory is dedicated to the investigation of biological materials, biofuel processing, and bio-inspired materials covering nanometer to micrometer length scales. The methods presented here for investigating physical properties (i.e., size and shape) of membrane proteins (here, MmIAP, an intramembrane aspartyl protease from Methanoculleus marisnigri) in solutions of micelle-forming detergents are well-suited for this small-angle neutron scattering instrument, among others. Other biophysical characterization techniques are hindered by their inability to address the detergent contributions in a protein-detergent complex structure. Additionally, access to the Bio-Deuteration Lab provides unique capabilities for preparing large-scale cultivations and expressing deuterium-labeled proteins for enhanced scattering signal from the protein. While this technique does not provide structural details at high-resolution, the structural knowledge gap for membrane proteins contains many addressable areas of research without requiring near-atomic resolution. For example, these areas include determination of oligomeric states, complex formation, conformational changes during perturbation, and folding/unfolding events. These investigations can be readily accomplished through applications of this method.

Contrast-Matching Detergent in Small-Angle Neutron Scattering Experiments for Membrane Protein Structural Analysis and Ab Initio Modeling

This protocol demonstrates how to obtain a low-resolution ab initio model and structural details of a detergent-solubilized membrane protein in solution using small-angle neutron scattering with contrast-matching of the detergent.

膜蛋白質の構造解析および経験的モデリング中性子小角散乱実験でコントラストに一致する洗剤

The biological small-angle neutron scattering instrument at the High-Flux Isotope Reactor of Oak Ridge National Laboratory is dedicated to the ...

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Protein-protein interactions involving proteins with multiple globular domains present technical challenges for determining how such complexes form and how the domains are oriented/positioned. Here, a protocol with the potential for elucidating which specific domains mediate interactions in multicomponent system through ab initio modeling is described. A method for calculating solution structures of macromolecules and their assemblies is provided that involves integrating data from small angle X-ray scattering (SAXS), chromatography, and atomic resolution structures together in a hybrid approach. A specific example is that of the complex of full-length nidogen-1, which assembles extracellular matrix proteins and forms an extended, curved nanostructure. One of its globular domains attaches to laminin &#947;-1, which structures the basement membrane. This provides a basis for determining accurate structures of flexible multidomain protein complexes and is enabled by synchrotron sources coupled with automation robotics and size exclusion chromatography systems. This combination allows rapid analysis in which multiple oligomeric states are separated just prior to SAXS data collection. The analysis yields information on the radius of gyration, particle dimension, molecular shape and interdomain pairing. The protocol for generating 3D models of complexes by fitting high-resolution structures of the component proteins is also given.

Here, we present how Small Angle X-Ray Scattering (SAXS) can be utilized to obtain information on low-resolution envelopes representing the macromolecular structures. When used in conjunction with high-resolution structural techniques such as X-Ray Crystallography and Nuclear Magnetic Resonance, SAXS can provide detailed insights into multidomain proteins and macromolecular complexes in-solution.

小角 x 線散乱による溶液中の高分子の構造研究

Protein-protein interactions involving proteins with multiple globular domains present technical challenges for determining how such complexes form and ...

Structure Solution of the Fluorescent Protein Cerulean Using MeshAndCollect

X-ray crystallography is the major technique used to obtain high resolution information concerning the 3-dimensional structures of biological macromolecules. Until recently, a major requirement has been the availability of relatively large, well diffracting crystals, which are often challenging to obtain. However, the advent of serial crystallography and a renaissance in multi-crystal data collection methods has meant that the availability of large crystals need no longer be a limiting factor. Here, we illustrate the use of the automated MeshAndCollect protocol, which first identifies the positions of many small crystals mounted on the same sample holder and then directs the collection from the crystals of a series of partial diffraction data sets for subsequent merging and use in structure determination. MeshAndCollect can be applied to any type of micro-crystals, even if weakly diffracting. As an example, we present here the use of the technique to solve the crystal structure of the Cyan Fluorescent Protein (CFP) Cerulean.

We present the use of the MeshAndCollect protocol to obtain a complete diffraction data set, for use in subsequent structure determination, composed of partial diffraction data sets collected from many small crystals of the fluorescent protein Cerulean.

MeshAndCollect を使用して蛍光タンパク質セルリアンの構造解析

X-ray crystallography is the major technique used to obtain high resolution information concerning the 3-dimensional structures of biological ...

Analysis of SEC-SAXS data via EFA deconvolution and Scatter

BioSAXS is a popular technique used in molecular and structural biology to determine the solution structure, particle size and shape, surface-to-volume ratio and conformational changes of macromolecules and macromolecular complexes. A high quality SAXS dataset for structural modeling must be from monodisperse, homogeneous samples and this is often only reached by a combination of inline chromatography and immediate SAXS measurement. Most commonly, size-exclusion chromatography is used to separate samples and exclude contaminants and aggregations from the particle of interest allowing SAXS measurements to be made from a well-resolved chromatographic peak of a single protein species. Still, in some cases, even inline purification is not a guarantee of monodisperse samples, either because multiple components are too close to each other in size or changes in shape induced through binding alter perceived elution time. In these cases, it may be possible to deconvolute the SAXS data of a mixture to obtain the idealized SAXS curves of individual components. Here, we show how this is achieved and the practical analysis of SEC-SAXS data is performed on ideal and difficult samples. Specifically, we show the SEC-SAXS analysis of the vaccinia E9 DNA polymerase exonuclease minus mutant.

SEC-BioSAXS measurements of biological macromolecules are a standard approach for determining solution structure of macromolecules and their complexes. Here, we analyze SEC-BioSAXS data from two types of commonly encountered SEC traces&#8212;chromatograms with fully resolved and partially resolved peaks. We demonstrate the analysis and deconvolution using scatter and BioXTAS RAW.

EFAデコンボリューションとスキャッタによるSEC-SAXSデータの分析

BioSAXS is a popular technique used in molecular and structural biology to determine the solution structure, particle size and shape, surface-to-volume ...

Assembly and Characterization of Polyelectrolyte Complex Micelles

Polyelectrolyte complex micelles (PCMs), core-shell nanoparticles formed by self-assembly of charged polymers in aqueous solution, provide a powerful platform for exploring the physics of polyelectrolyte interactions and also offer a promising solution to the pressing problem of delivering therapeutic oligonucleotides in vivo. Developing predictive structure-property relationships for PCMs has proven difficult, in part due to the presence of strong kinetic traps during nanoparticle self-assembly. This article discusses criteria for choosing polymers for PCM construction and provides protocols based on salt annealing that enable assembly of repeatable, low-polydispersity nanoparticles. We also discuss PCM characterization using light scattering, small-angle X-ray scattering, and electron microscopy.

We provide protocols and representative data for designing, assembling, and characterizing polyelectrolyte complex micelles, core-shell nanoparticles formed by polyelectrolytes and hydrophilic charged-uncharged block copolymers.

高分子電解質複合体ミセルの組み立てと特徴付け

Polyelectrolyte complex micelles (PCMs), core-shell nanoparticles formed by self-assembly of charged polymers in aqueous solution, provide a powerful ...