5CNX

Crystal structure of Xaa-Pro aminopeptidase from Escherichia coli K12


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures and activities of widely conserved small prokaryotic aminopeptidases-P clarify classification of M24B peptidases

Are, V.N.Kumar, A.Goyal, V.D.Gotad, S.S.Ghosh, B.Gadre, R.Jamdar, S.N.Makde, R.D.

(2018) Proteins 

  • DOI: 10.1002/prot.25641
  • Primary Citation of Related Structures:  
    5CNX, 5GIQ

  • PubMed Abstract: 
  • M24B peptidases cleaving Xaa-Pro bond in dipeptides are prolidases whereas those cleaving this bond in longer peptides are aminopeptidases-P. Bacteria have small aminopeptidases-P (36-39 kDa), which are diverged from canonical aminopeptidase-P of Escherichia coli (50 kDa) ...

    M24B peptidases cleaving Xaa-Pro bond in dipeptides are prolidases whereas those cleaving this bond in longer peptides are aminopeptidases-P. Bacteria have small aminopeptidases-P (36-39 kDa), which are diverged from canonical aminopeptidase-P of Escherichia coli (50 kDa). Structure-function studies of small aminopeptidases-P are lacking. We report crystal structures of small aminopeptidases-P from E. coli and Deinococcus radiodurans, and report substrate-specificities of these proteins and their ortholog from Mycobacterium tuberculosis. These are aminopeptidases-P, structurally close to small prolidases except for absence of dipeptide-selectivity loop. We noticed absence of this loop and conserved arginine in canonical archaeal prolidase (Maher et al., Biochemistry. 43, 2004, 2771-2783) and questioned its classification. Our enzymatic assays show that this enzyme is an aminopeptidase-P. Further, our mutagenesis studies illuminate importance of DXRY sequence motif in bacterial small aminopeptidases-P and suggest common evolutionary origin with human XPNPEP1/XPNPEP2. Our analyses reveal sequence/structural features distinguishing small aminopeptidases-P from other M24B peptidases.


    Organizational Affiliation

    High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aminopeptidase YpdFA, B, C361Escherichia coli K-12Mutation(s): 1 
Gene Names: ypdFb2385JW2382
EC: 3.4.11
UniProt
Find proteins for P76524 (Escherichia coli (strain K12))
Explore P76524 
Go to UniProtKB:  P76524
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.220 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 224.202α = 90
b = 224.202β = 90
c = 74.636γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
Cootmodel building
PHENIXmodel building
PHASERphasing
Aimlessdata scaling
XDSdata processing
MAR345dtbdata collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-07-20
    Type: Initial release
  • Version 1.1: 2018-07-04
    Changes: Data collection, Database references, Derived calculations
  • Version 1.2: 2019-01-16
    Changes: Data collection, Database references