6OH2

X-ray crystal structure of the mouse CMP-sialic acid transporter in complex with CMP, by lipidic cubic phase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.58 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 

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This is version 1.1 of the entry. See complete history


Literature

Structural basis for mammalian nucleotide sugar transport.

Ahuja, S.Whorton, M.R.

(2019) Elife 8

  • DOI: 10.7554/eLife.45221
  • Primary Citation of Related Structures:  
    6OH2, 6OH3, 6OH4

  • PubMed Abstract: 
  • Nucleotide-sugar transporters (NSTs) are critical components of the cellular glycosylation machinery. They transport nucleotide-sugar conjugates into the Golgi lumen, where they are used for the glycosylation of proteins and lipids, and they then subsequently transport the nucleotide monophosphate byproduct back to the cytoplasm ...

    Nucleotide-sugar transporters (NSTs) are critical components of the cellular glycosylation machinery. They transport nucleotide-sugar conjugates into the Golgi lumen, where they are used for the glycosylation of proteins and lipids, and they then subsequently transport the nucleotide monophosphate byproduct back to the cytoplasm. Dysregulation of human NSTs causes several debilitating diseases, and NSTs are virulence factors for many pathogens. Here we present the first crystal structures of a mammalian NST, the mouse CMP-sialic acid transporter (mCST), in complex with its physiological substrates CMP and CMP-sialic acid. Detailed visualization of extensive protein-substrate interactions explains the mechanisms governing substrate selectivity. Further structural analysis of mCST's unique lumen-facing partially-occluded conformation, coupled with the characterization of substrate-induced quenching of mCST's intrinsic tryptophan fluorescence, reveals the concerted conformational transitions that occur during substrate transport. These results provide a framework for understanding the effects of disease-causing mutations and the mechanisms of this diverse family of transporters.


    Organizational Affiliation

    Vollum Institute, Oregon Health & Science University, Portland, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CMP-sialic acid transporterA330Mus musculusMutation(s): 0 
Gene Names: Slc35a1
Membrane Entity: Yes 
UniProt
Find proteins for Q61420 (Mus musculus)
Explore Q61420 
Go to UniProtKB:  Q61420
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ61420
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C5P (Subject of Investigation/LOI)
Query on C5P

Download Ideal Coordinates CCD File 
B [auth A]CYTIDINE-5'-MONOPHOSPHATE
C9 H14 N3 O8 P
IERHLVCPSMICTF-XVFCMESISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.58 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 144.54α = 90
b = 49.53β = 107.63
c = 50.15γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM130909

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-24
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Author supporting evidence