Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 70.27 kDa 
• Atom Count: 4493 
• Modelled Residue Count: 544 
• Deposited Residue Count: 622 
• Unique protein chains: 1

3PPP

Structures of the substrate-binding protein provide insights into the multiple compatible solutes binding specificities of Bacillus subtilis ABC transporter OpuC

• PDB DOI: 10.2210/pdb3PPP/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Bacillus subtilis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-11-25 Released: 2011-05-11 
• Deposition Author(s): Du, Y., Shi, W.W., He, Y.X., Yang, Y.H., Zhou, C.Z., Chen, Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.253 
• R-Value Work: 0.216 
• R-Value Observed: 0.218 

Literature

Structures of the substrate-binding protein provide insights into the multiple compatible solute binding specificities of the Bacillus subtilis ABC transporter OpuC

Du, Y., Shi, W.W., He, Y.X., Yang, Y.H., Zhou, C.Z., Chen, Y.

(2011) Biochem J 436: 283-289

• PubMed: 21366542 
• DOI: 10.1042/BJ20102097
• Primary Citation of Related Structures:  
  3PPN, 3PPO, 3PPP, 3PPQ, 3PPR


• PubMed Abstract: 
  

The compatible solute ABC (ATP-binding cassette) transporters are indispensable for acquiring a variety of compatible solutes under osmotic stress in Bacillus subtilis. The substrate-binding protein OpuCC (Opu is osmoprotectant uptake) of the ABC transporter OpuC can recognize a broad spectrum of compatible solutes, compared with its 70% sequence-identical paralogue OpuBC that can solely bind choline. To explore the structural basis of this difference of substrate specificity, we determined crystal structures of OpuCC in the apo-form and in complex with carnitine, glycine betaine, choline and ectoine respectively. OpuCC is composed of two α/β/α globular sandwich domains linked by two hinge regions, with a substrate-binding pocket located at the interdomain cleft. Upon substrate binding, the two domains shift towards each other to trap the substrate. Comparative structural analysis revealed a plastic pocket that fits various compatible solutes, which attributes themultiple-substrate binding property to OpuCC. This plasticity is a gain-of-function via a single-residue mutation of Thr⁹⁴ in OpuCC compared with Asp⁹⁶ in OpuBC.

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Organizational Affiliation: 

Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People's Republic of China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Glycine betaine/carnitine/choline-binding protein	A, B	311	Bacillus subtilis	Mutation(s): 0  Gene Names: opuCC
UniProt
Find proteins for O32243 (Bacillus subtilis (strain 168)) Explore O32243  Go to UniProtKB:  O32243

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BET	C [auth A], D [auth B]	TRIMETHYL GLYCINE C5 H12 N O2 KWIUHFFTVRNATP-UHFFFAOYSA-O

Binding Affinity Annotations
ID	Source	Binding Affinity
BET	PDBBind:  3PPP	Kd: 6000 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.253 
• R-Value Work: 0.216 
• R-Value Observed: 0.218 
• Space Group: P 2 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 61.821	α = 90
b = 91.782	β = 90
c = 115.334	γ = 90

Software Package:

Software Name	Purpose
MAR345dtb	data collection
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-11-25 
• Released Date: 2011-05-11 
Deposition Author(s): Du, Y., Shi, W.W., He, Y.X., Yang, Y.H., Zhou, C.Z., Chen, Y.

Revision History  

• Version 1.0: 2011-05-11
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2014-04-09
  Changes: Database references