6I1R

Crystal structure of CMP bound CST in an outward facing conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Structural basis for the delivery of activated sialic acid into Golgi for sialyation.

Nji, E.Gulati, A.Qureshi, A.A.Coincon, M.Drew, D.

(2019) Nat Struct Mol Biol 26: 415-423

  • DOI: 10.1038/s41594-019-0225-y
  • Primary Citation of Related Structures:  
    6I1R, 6I1Z

  • PubMed Abstract: 
  • The decoration of secretory glycoproteins and glycolipids with sialic acid is critical to many physiological and pathological processes. Sialyation is dependent on a continuous supply of sialic acid into Golgi organelles in the form of CMP-sialic acid. Translocation of CMP-sialic acid into Golgi is carried out by the CMP-sialic acid transporter (CST) ...

    The decoration of secretory glycoproteins and glycolipids with sialic acid is critical to many physiological and pathological processes. Sialyation is dependent on a continuous supply of sialic acid into Golgi organelles in the form of CMP-sialic acid. Translocation of CMP-sialic acid into Golgi is carried out by the CMP-sialic acid transporter (CST). Mutations in human CST are linked to glycosylation disorders, and CST is important for glycopathway engineering, as it is critical for sialyation efficiency of therapeutic glycoproteins. The mechanism of how CMP-sialic acid is recognized and translocated across Golgi membranes in exchange for CMP is poorly understood. Here we have determined the crystal structure of a Zea mays CST in complex with CMP. We conclude that the specificity of CST for CMP-sialic acid is established by the recognition of the nucleotide CMP to such an extent that they are mechanistically capable of both passive and coupled antiporter activity.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden. ddrew@dbb.su.se.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CMP-sialic acid transporter 1A, B322Zea maysMutation(s): 5 
Gene Names: 100274139ZEAMMB73_Zm00001d046060
Membrane Entity: Yes 
UniProt
Find proteins for B4FZ94 (Zea mays)
Explore B4FZ94 
Go to UniProtKB:  B4FZ94
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB4FZ94
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C5P
Query on C5P

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.379α = 90
b = 181.009β = 90
c = 53.081γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Knut and Alice Wallenberg FoundationSweden--

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-05
    Type: Initial release
  • Version 1.1: 2019-06-19
    Changes: Data collection, Database references