6N7E

Crystal structure of the cytosolic domain of human CNNM2 in complex with AMP-PNP and Mg2+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.282 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mg2+-ATP Sensing in CNNM, a Putative Magnesium Transporter.

Chen, Y.S.Kozlov, G.Fakih, R.Yang, M.Zhang, Z.Kovrigin, E.L.Gehring, K.

(2020) Structure 28: 324-335.e4

  • DOI: 10.1016/j.str.2019.11.016
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The family of cystathionine-β-synthase (CBS)-pair domain divalent metal cation transport mediators (CNNMs) is composed of four integral membrane proteins associated with Mg 2+ transport. Structurally, CNNMs contain large cytosolic regions ...

    The family of cystathionine-β-synthase (CBS)-pair domain divalent metal cation transport mediators (CNNMs) is composed of four integral membrane proteins associated with Mg 2+ transport. Structurally, CNNMs contain large cytosolic regions composed of a CBS-pair and a cyclic nucleotide-binding homology (CNBH) domain. How these regulate Mg 2+ transport activity is unknown. Here, we determined the crystal structures of cytosolic fragments in two conformations: Mg 2+ -ATP-analog bound and ligand free. The structures reveal open and closed conformations with functionally important contacts not observed in structures of the individual domains. We also identified a second Mg 2+ -binding region in the CBS-pair domain and a different dimerization interface for the CNBH domain. Analytical ultracentrifugation and isothermal titration calorimetry experiments revealed a tight correlation between Mg 2+ -ATP binding and protein dimerization. Mutations that blocked either function prevented cellular Mg 2+ efflux activity. The results suggest Mg 2+ efflux is regulated by conformational changes associated with Mg 2+ -ATP binding to CNNM CBS-pair domains.


    Organizational Affiliation

    Department of Biochemistry & Centre for Structural Biology, McGill University, Montreal, QC H3G 0B1, Canada. Electronic address: kalle.gehring@mcgill.ca.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Metal transporter CNNM2,Metal transporter CNNM2
A, B, C, D
354Homo sapiensMutation(s): 0 
Gene Names: CNNM2ACDP2
Find proteins for Q9H8M5 (Homo sapiens)
Go to UniProtKB:  Q9H8M5
NIH Common Fund Data Resources
PHAROS  Q9H8M5
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP

Download CCD File 
A, B, C, D
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A, B, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.282 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 290.582α = 90
b = 111.139β = 101.01
c = 103.519γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2019-12-04
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Database references
  • Version 1.2: 2020-03-18
    Changes: Database references