3M9B

Crystal structure of the amino terminal coiled coil domain and the inter domain of the Mycobacterium tuberculosis proteasomal ATPase Mpa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.94 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.275 
  • R-Value Observed: 0.276 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Binding-induced folding of prokaryotic ubiquitin-like protein on the Mycobacterium proteasomal ATPase targets substrates for degradation.

Wang, T.Darwin, K.H.Li, H.

(2010) Nat Struct Mol Biol 17: 1352-1357

  • DOI: https://doi.org/10.1038/nsmb.1918
  • Primary Citation of Related Structures:  
    3M91, 3M9B, 3M9D, 3M9H

  • PubMed Abstract: 

    Mycobacterium tuberculosis uses a proteasome system that is analogous to the eukaryotic ubiquitin-proteasome pathway and is required for pathogenesis. However, the bacterial analog of ubiquitin, prokaryotic ubiquitin-like protein (Pup), is an intrinsically disordered protein that bears little sequence or structural resemblance to the highly structured ubiquitin. Thus, it was unknown how pupylated proteins were recruited to the proteasome. Here, we show that the Mycobacterium proteasomal ATPase (Mpa) has three pairs of tentacle-like coiled coils that recognize Pup. Mpa bound unstructured Pup through hydrophobic interactions and a network of hydrogen bonds, leading to the formation of an α-helix in Pup. Our work describes a binding-induced folding recognition mechanism in the Pup-proteasome system that differs mechanistically from substrate recognition in the ubiquitin-proteasome system. This key difference between the prokaryotic and eukaryotic systems could be exploited for the development of a small molecule-based treatment for tuberculosis.


  • Organizational Affiliation

    Biology Department, Brookhaven National Laboratory, Upton, New York, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome-associated ATPase
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
251Mycobacterium tuberculosisMutation(s): 0 
Gene Names: mpa
UniProt
Find proteins for P9WQN5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WQN5 
Go to UniProtKB:  P9WQN5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WQN5
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.94 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.275 
  • R-Value Observed: 0.276 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 176.787α = 90
b = 176.652β = 90.04
c = 176.633γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXmodel building
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-10-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description
  • Version 1.3: 2024-02-21
    Changes: Data collection, Database references, Refinement description