5D6K

PepT - CIM

5D6K の概要

• エントリーDOI: 10.2210/pdb5d6k/pdb
• 分子名称: Di-or tripeptide:H+ symporter, PHOSPHATE ION, (2R)-2,3-dihydroxypropyl (9Z)-hexadec-9-enoate, ... (5 entities in total)
• 機能のキーワード: alpha-helical, major facilitator superfamily (mfs) transporters, peptst oligopeptide-proton symporter (pot family), transport protein
• 由来する生物種: Streptococcus thermophilus (strain ATCC BAA-250 / LMG 18311)
• 細胞内の位置: Membrane ; Multi-pass membrane protein : Q5M4H8
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 56161.99

構造登録者

Ma, P.,Caffrey, M. (登録日: 2015-08-12, 公開日: 2016-08-17, 最終更新日: 2024-01-10)

主引用文献

Ma, P.,Weichert, D.,Aleksandrov, L.A.,Jensen, T.J.,Riordan, J.R.,Liu, X.,Kobilka, B.K.,Caffrey, M.
The cubicon method for concentrating membrane proteins in the cubic mesophase.
Nat Protoc, 12:1745-1762, 2017

PubMed Abstract: The lipid cubic phase (in meso) method is an important approach for generating crystals and high-resolution X-ray structures of integral membrane proteins. However, as a consequence of instability, it can be impossible-using traditional methods-to concentrate certain membrane proteins and complexes to values suitable for in meso crystallization and structure determination. The cubicon method described here exploits the amphiphilic nature of membrane proteins and their natural tendency to partition preferentially into lipid bilayers from aqueous solution. Using several rounds of reconstitution, the protein concentration in the bilayer of the cubic mesophase can be ramped up stepwise from less than a milligram per milliliter to tens of milligrams per milliliter for crystallogenesis. The general applicability of the method is demonstrated with five integral membrane proteins: the β-adrenergic G protein-coupled receptor (βAR), the peptide transporter (PepT), diacylglycerol kinase (DgkA), the alginate transporter (AlgE) and the cystic fibrosis transmembrane conductance regulator (CFTR). In the cases of βAR, PepT, DgkA and AlgE, an effective 20- to 45-fold concentration was realized, resulting in a protein-laden mesophase that allowed the formation of crystals using the in meso method and structure determination to resolutions ranging from 2.4 Å to 3.2 Å. In addition to opening up in meso crystallization to a broader range of integral membrane protein targets, the cubicon method should find application in situations that require membrane protein reconstitution in a lipid bilayer at high concentrations. These applications include functional and biophysical characterization studies for ligand screening, drug delivery, antibody production and protein complex formation. A typical cubicon experiment can be completed in 3-5 h.

PubMed: 28771236
DOI: 10.1038/nprot.2017.057

実験手法

X-RAY DIFFRACTION (2.4 Å)