7M1U

Crystal structure of an archaeal CNNM, MtCorB, R235L mutant with C-terminal deletion


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.80 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.245 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of an archaeal CorB magnesium transporter.

Chen, Y.S.Kozlov, G.Moeller, B.E.Rohaim, A.Fakih, R.Roux, B.Burke, J.E.Gehring, K.

(2021) Nat Commun 12: 4028-4028

  • DOI: 10.1038/s41467-021-24282-7
  • Primary Citation of Related Structures:  
    7MSU, 7M1U, 7M1T

  • PubMed Abstract: 
  • CNNM/CorB proteins are a broadly conserved family of integral membrane proteins with close to 90,000 protein sequences known. They are associated with Mg 2+ transport but it is not known if they mediate transport themselves or regulate other transporters ...

    CNNM/CorB proteins are a broadly conserved family of integral membrane proteins with close to 90,000 protein sequences known. They are associated with Mg 2+ transport but it is not known if they mediate transport themselves or regulate other transporters. Here, we determine the crystal structure of an archaeal CorB protein in two conformations (apo and Mg 2+ -ATP bound). The transmembrane DUF21 domain exists in an inward-facing conformation with a Mg 2+ ion coordinated by a conserved π-helix. In the absence of Mg 2+ -ATP, the CBS-pair domain adopts an elongated dimeric configuration with previously unobserved domain-domain contacts. Hydrogen-deuterium exchange mass spectrometry, analytical ultracentrifugation, and molecular dynamics experiments support a role of the structural rearrangements in mediating Mg 2+ -ATP sensing. Lastly, we use an in vitro, liposome-based assay to demonstrate direct Mg 2+ transport by CorB proteins. These structural and functional insights provide a framework for understanding function of CNNMs in Mg 2+ transport and associated diseases.


    Organizational Affiliation

    Department of Biochemistry & Centre de Recherche en Biologie Structurale, McGill University, Montréal, QC, Canada. kalle.gehring@mcgill.ca.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Hemolysin, contains CBS domainsA, B328Methanoculleus thermophilusMutation(s): 1 
Gene Names: SAMN04488571_101329
Membrane Entity: Yes 
UniProt
Find proteins for A0A1G8XA46 (Methanoculleus thermophilus)
Explore A0A1G8XA46 
Go to UniProtKB:  A0A1G8XA46
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.80 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.245 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.168α = 90
b = 124.024β = 92.813
c = 86.261γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing
PHENIXrefinement

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaRGPIN-2020-07195

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-16
    Type: Initial release
  • Version 1.1: 2021-07-07
    Changes: Database references