Biological Assembly 1  

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

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 25.45 kDa 
• Atom Count: 1915 
• Modelled Residue Count: 245 
• Deposited Residue Count: 246 
• Unique protein chains: 1

2F2B

Crystal structure of integral membrane protein Aquaporin AqpM at 1.68A resolution

• PDB DOI: 10.2210/pdb2F2B/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Methanothermobacter marburgensis str. Marburg
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2005-11-15 Released: 2005-12-06 
• Deposition Author(s): Lee, J.K., Kozono, D., Remis, J., Kitagawa, Y., Agre, P., Stroud, R.M., Center for Structures of Membrane Proteins (CSMP)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.68 Å
• R-Value Free: 0.193 
• R-Value Work: 0.184 
• R-Value Observed: 0.193 

Literature

Structural basis for conductance by the archaeal aquaporin AqpM at 1.68 A.

Lee, J.K., Kozono, D., Remis, J., Kitagawa, Y., Agre, P., Stroud, R.M.

(2005) Proc Natl Acad Sci U S A 102: 18932-18937

• PubMed: 16361443 
• DOI: 10.1073/pnas.0509469102
• Primary Citation of Related Structures:  
  2EVU, 2F2B


• PubMed Abstract: 
  

To explore the structural basis of the unique selectivity spectrum and conductance of the transmembrane channel protein AqpM from the archaeon Methanothermobacter marburgensis, we determined the structure of AqpM to 1.68-A resolution by x-ray crystallography. The structure establishes AqpM as being in a unique subdivision between the two major subdivisions of aquaporins, the water-selective aquaporins, and the water-plus-glycerol-conducting aquaglyceroporins. In AqpM, isoleucine replaces a key histidine residue found in the lumen of water channels, which becomes a glycine residue in aquaglyceroporins. As a result of this and other side-chain substituents in the walls of the channel, the channel is intermediate in size and exhibits differentially tuned electrostatics when compared with the other subfamilies.

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Organizational Affiliation: 

Macromolecular Structure Group, Department of Biochemistry and Biophysics, University of California, S-412C Genentech Hall, 600 16th Street, San Francisco, CA 94143-2240, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Aquaporin aqpM	A	246	Methanothermobacter marburgensis str. Marburg	Mutation(s): 0  Gene Names: aqpM, MTBMA_c05510 Membrane Entity: Yes
UniProt
Find proteins for Q9C4Z5 (Methanothermobacter marburgensis (strain ATCC BAA-927 / DSM 2133 / JCM 14651 / NBRC 100331 / OCM 82 / Marburg)) Explore Q9C4Z5  Go to UniProtKB:  Q9C4Z5

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	B [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.68 Å
• R-Value Free: 0.193 
• R-Value Work: 0.184 
• R-Value Observed: 0.193 
• Space Group: I 4

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 88.513	α = 90
b = 88.513	β = 90
c = 79.947	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing
CNS	refinement
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-11-15 
• Released Date: 2005-12-06 
Deposition Author(s): Lee, J.K., Kozono, D., Remis, J., Kitagawa, Y., Agre, P., Stroud, R.M., Center for Structures of Membrane Proteins (CSMP)

Revision History  

• Version 1.0: 2005-12-06
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance