Experimental Data Snapshot

  • Resolution: 1.80 Å

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Insights into the mechanism of Escherichia coli methionine aminopeptidase from the structural analysis of reaction products and phosphorus-based transition-state analogues.

Lowther, W.T.Zhang, Y.Sampson, P.B.Honek, J.F.Matthews, B.W.

(1999) Biochemistry 38: 14810-14819

  • DOI: https://doi.org/10.1021/bi991711g
  • Primary Citation of Related Structures:  
    1C21, 1C22, 1C23, 1C24, 1C27

  • PubMed Abstract: 

    In an effort to differentiate between alternative mechanistic schemes that have been postulated for Escherichia coli methionine aminopeptidase (eMetAP), the modes of binding of a series of products and phosphorus-based transition-state analogues were determined by X-ray crystallography. Methionine phosphonate, norleucine phosphonate, and methionine phosphinate bind with the N-terminal group interacting with Co2 and with the respective phosphorus oxygens binding between the metals, interacting in a bifurcated manner with Co1 and His178 and hydrogen bonded to His79. In contrast, the reaction product methionine and its analogue trifluoromethionine lose interactions with Co1 and His79. The interactions with the transition-state analogues are, in general, very similar to those seen previously for the complex of the enzyme with a bestatin-based inhibitor. The mode of interaction of His79 is, however, different. In the case of the bestatin-based inhibitor, His79 interacts with atoms in the peptide bond between the P(1)' and P(2)' residues. In the present transition-state analogues, however, the histidine moves 1.2 A toward the metal center and hydrogen bonds with the atom that corresponds to the nitrogen of the scissile peptide bond (i.e., between the P(1) and P(1)' residues). These observations tend to support one of the mechanistic schemes for eMetAP considered before, although with a revision in the role played by His79. The results also suggest parallels between the mechanism of action of methionine aminopeptidase and other "pita-bread" enzymes including aminopeptidase P and creatinase.

  • Organizational Affiliation

    Institute of Molecular Biology, Howard Hughes Medical Institute and Department of Physics, 1229 University of Oregon, Eugene, Oregon 97403, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
METHIONINE AMINOPEPTIDASE263Escherichia coliMutation(s): 1 
Find proteins for P0AE18 (Escherichia coli (strain K12))
Explore P0AE18 
Go to UniProtKB:  P0AE18
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AE18
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.242α = 90
b = 67.588β = 111.2
c = 48.927γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-11-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations
  • Version 1.4: 2024-02-07
    Changes: Data collection