4ONU

cAMP-binding acyltransferase from Mycobacterium smegmatis, E234A mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.206 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Allostery and Conformational Dynamics in cAMP-binding Acyltransferases.

Podobnik, M.Siddiqui, N.Rebolj, K.Nambi, S.Merzel, F.Visweswariah, S.S.

(2014) J Biol Chem 289: 16588-16600

  • DOI: https://doi.org/10.1074/jbc.M114.560086
  • Primary Citation of Related Structures:  
    4OLL, 4ONU, 4ORF

  • PubMed Abstract: 

    Mycobacteria harbor unique proteins that regulate protein lysine acylation in a cAMP-regulated manner. These lysine acyltransferases from Mycobacterium smegmatis (KATms) and Mycobacterium tuberculosis (KATmt) show distinctive biochemical properties in terms of cAMP binding affinity to the N-terminal cyclic nucleotide binding domain and allosteric activation of the C-terminal acyltransferase domain. Here we provide evidence for structural features in KATms that account for high affinity cAMP binding and elevated acyltransferase activity in the absence of cAMP. Structure-guided mutational analysis converted KATms from a cAMP-regulated to a cAMP-dependent acyltransferase and identified a unique asparagine residue in the acyltransferase domain of KATms that assists in the enzymatic reaction in the absence of a highly conserved glutamate residue seen in Gcn5-related N-acetyltransferase-like acyltransferases. Thus, we have identified mechanisms by which properties of similar proteins have diverged in two species of mycobacteria by modifications in amino acid sequence, which can dramatically alter the abundance of conformational states adopted by a protein.


  • Organizational Affiliation

    From the Laboratory for Molecular Biology and Nanobiotechnology and marjetka.podobnik@ki.si.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetyltransferase Pat340Mycolicibacterium smegmatis MC2 155Mutation(s): 1 
Gene Names: MSMEG_5458MSMEI_5308
EC: 2.3.1
UniProt
Find proteins for A0R3F9 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0R3F9 
Go to UniProtKB:  A0R3F9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0R3F9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.318α = 90
b = 82.764β = 90
c = 105.969γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-30
    Type: Initial release
  • Version 1.1: 2014-06-18
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Refinement description
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description