4BZP

Structure of the Mycobacterium tuberculosis APS kinase CysC in complex with ADP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.47 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 

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Literature

Crystal Structures of the Kinase Domain of the Sulfate-Activating Complex in Mycobacterium Tuberculosis.

Poyraz, O., Brunner, K., Lohkamp, B., Axelsson, H., Hammarstrom, L.G.J., Schnell, R., Schneider, G.

(2015) PLoS One 10: 21494

  • DOI: 10.1371/journal.pone.0121494
  • Primary Citation of Related Structures:  
    4BZP, 4BZQ, 4BZX, 4RFV

  • PubMed Abstract: 

    • In Mycobacterium tuberculosis the sulfate activating complex provides a key branching point in sulfate assimilation. The complex consists of two polypeptide chains, CysD and CysN. CysD is an ATP sulfurylase that, with the energy provided by the GTPase activity of CysN, forms adenosine-5'-phosphosulfate (APS) which can then enter the reductive branch of sulfate assimilation leading to the biosynthesis of cysteine ...

    In Mycobacterium tuberculosis the sulfate activating complex provides a key branching point in sulfate assimilation. The complex consists of two polypeptide chains, CysD and CysN. CysD is an ATP sulfurylase that, with the energy provided by the GTPase activity of CysN, forms adenosine-5'-phosphosulfate (APS) which can then enter the reductive branch of sulfate assimilation leading to the biosynthesis of cysteine. The CysN polypeptide chain also contains an APS kinase domain (CysC) that phosphorylates APS leading to 3'-phosphoadenosine-5'-phosphosulfate, the sulfate donor in the synthesis of sulfolipids. We have determined the crystal structures of CysC from M. tuberculosis as a binary complex with ADP, and as ternary complexes with ADP and APS and the ATP mimic AMP-PNP and APS, respectively, to resolutions of 1.5 Å, 2.1 Å and 1.7 Å, respectively. CysC shows the typical APS kinase fold, and the structures provide comprehensive views of the catalytic machinery, conserved in this enzyme family. Comparison to the structure of the human homolog show highly conserved APS and ATP binding sites, questioning the feasibility of the design of specific inhibitors of mycobacterial CysC. Residue Cys556 is part of the flexible lid region that closes off the active site upon substrate binding. Mutational analysis revealed this residue as one of the determinants controlling lid closure and hence binding of the nucleotide substrate.

    Organizational Affiliation: 

    Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BIFUNCTIONAL ENZYME CYSN/CYSCA, B174Mycobacterium tuberculosisMutation(s): 0 
EC: 2.7.1.25 (PDB Primary Data), 2.7.7.4 (UniProt)
UniProt
Find proteins for A5U1Y4 (Mycobacterium tuberculosis (strain ATCC 25177 / H37Ra))
Explore A5U1Y4 
Go to UniProtKB:  A5U1Y4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA5U1Y4
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.47 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.63α = 90
b = 66.33β = 103.59
c = 61.76γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-06
    Type: Initial release
  • Version 1.1: 2015-04-08
    Changes: Database references