6LGV

Crystal structure of a cysteine-pair mutant (P10C-S291C) of a bacterial bile acid transporter in an inward-facing state complexed with citrate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


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Literature

Substrate binding in the bile acid transporter ASBT Yf from Yersinia frederiksenii.

Wang, X.Lyu, Y.Ji, Y.Sun, Z.Zhou, X.

(2021) Acta Crystallogr D Struct Biol 77: 117-125

  • DOI: 10.1107/S2059798320015004
  • Primary Citation of Related Structures:  
    6LH0, 6LGZ, 6LGY, 6LGV

  • PubMed Abstract: 
  • Apical sodium-dependent bile acid transporter (ASBT) retrieves bile acids from the small intestine and plays a pivotal role in enterohepatic circulation. Currently, high-resolution structures are available for two bacterial ASBT homologs (ASBT NM from Neisseria meningitides and ASBT Yf from Yersinia frederiksenii), from which an elevator-style alternating-access mechanism has been proposed for substrate transport ...

    Apical sodium-dependent bile acid transporter (ASBT) retrieves bile acids from the small intestine and plays a pivotal role in enterohepatic circulation. Currently, high-resolution structures are available for two bacterial ASBT homologs (ASBT NM from Neisseria meningitides and ASBT Yf from Yersinia frederiksenii), from which an elevator-style alternating-access mechanism has been proposed for substrate transport. A key concept in this model is that the substrate binds to the central cavity of the transporter so that the elevator-like motion can expose the bound substrate alternatingly to either side of the membrane during a transport cycle. However, no structure of an ASBT has been solved with a substrate bound in its central cavity, so how a substrate binds to ASBT remains to be defined. In this study, molecular docking, structure determination and functional analysis were combined to define and validate the details of substrate binding in ASBT Yf . The findings provide coherent evidence to provide a clearer picture of how the substrate binds in the central cavity of ASBT Yf that fits the alternating-access model.


    Organizational Affiliation

    Department of Integrated Traditional Chinese and Western Medicine, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, People's Republic of China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transporter, sodium/bile acid symporter family A312Yersinia frederikseniiMutation(s): 2 
Gene Names: NCTC11470_02445
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Apical Sodium-Dependent Bile Acid Transporters (ASBT)
Protein: 
Bacterial homologue of ASBT (ASBTγf), P10C-S291C mutant, inward-facing state complexed with citrate
Find proteins for A0A380PV03 (Yersinia frederiksenii)
Explore A0A380PV03 
Go to UniProtKB:  A0A380PV03
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.798α = 90
b = 91.779β = 90
c = 44.855γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31770783

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-09
    Type: Initial release
  • Version 1.1: 2021-01-13
    Changes: Database references