Intracellular Ser/Thr protein kinase domain of Mycobacterium tuberculosis PknB.

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 

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Structure of Mycobacterium tuberculosis PknB supports a universal activation mechanism for Ser/Thr protein kinases.

Young, T.A.Delagoutte, B.Endrizzi, J.A.Falick, A.M.Alber, T.

(2003) Nat Struct Biol 10: 168-174

  • DOI: https://doi.org/10.1038/nsb897
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    A family of eukaryotic-like Ser/Thr protein kinases occurs in bacteria, but little is known about the structures and functions of these proteins. Here we characterize PknB, a transmembrane signaling kinase from Mycobacterium tuberculosis. The intracellular PknB kinase domain is active autonomously, and the active enzyme is phosphorylated on residues homologous to regulatory phospho-acceptors in eukaryotic Ser/Thr kinases. The crystal structure of the PknB kinase domain in complex with an ATP analog reveals the active conformation. The predicted fold of the PknB extracellular domain matches the proposed targeting domain of penicillin-binding protein 2x. The structural and chemical similarities of PknB to metazoan homologs support a universal activation mechanism of Ser/Thr protein kinases in prokaryotes and eukaryotes.

  • Organizational Affiliation

    Department of Molecular and Cell Biology, 229 Stanley Hall 3206, University of California, Berkeley, California 94720-3206, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Probable serine/threonine-protein kinase pknB
A, B
311Mycobacterium tuberculosisMutation(s): 0 
EC: 2.7.1
Find proteins for P9WI81 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WI81 
Go to UniProtKB:  P9WI81
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WI81
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.1α = 90
b = 50.17β = 96.19
c = 111.07γ = 90
Software Package:
Software NamePurpose
ELVESdata reduction
ELVESmodel building
ELVESdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-02-11
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2019-07-24
    Changes: Data collection, Refinement description
  • Version 1.5: 2024-02-14
    Changes: Data collection, Database references, Derived calculations