1WKM

THE PRODUCT BOUND FORM OF THE MN(II)LOADED METHIONINE AMINOPEPTIDASE FROM HYPERTHERMOPHILE PYROCOCCUS FURIOSUS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

EPR and X-ray crystallographic characterization of the product-bound form of the MnII-loaded methionyl aminopeptidase from Pyrococcus furiosus

Copik, A.J.Nocek, B.P.Swierczek, S.I.Ruebush, S.Jang, S.B.Meng, L.D'souza, V.M.Peters, J.W.Bennett, B.Holz, R.C.

(2005) Biochemistry 44: 121-129

  • DOI: https://doi.org/10.1021/bi048123+
  • Primary Citation of Related Structures:  
    1WKM

  • PubMed Abstract: 

    Methionine aminopeptidases (MetAPs) are ubiquitous metallohydrolases that remove the N-terminal methionine from nascent polypeptide chains. Although various crystal structures of MetAP in the presence of inhibitors have been solved, the structural aspects of the product-bound step has received little attention. Both perpendicular- and parallel-mode electron paramagnetic resonance (EPR) spectra were recorded for the Mn(II)-loaded forms of the type-I (Escherichia coli) and type-II (Pyrococcus furiosus) MetAPs in the presence of the reaction product l-methionine (L-Met). In general, similar EPR features were observed for both [MnMn(EcMetAP-I)]-L-Met and [MnMn(PfMetAP-II)]-L-Met. The observed perpendicular-mode EPR spectra consisted of a six-line hyperfine pattern at g = 2.03 (A = 8.8 mT) with less intense signals with eleven-line splitting at g = 2.4 and 1.7 (A = 4.4 mT). The former feature results from mononuclear, magnetically isolated Mn(II) ions and this signal are 3-fold more intense in the [MnMn(PfMetAP-II)]-L-Met EPR spectrum than in the [MnMn(EcMetAP-I)]-L-Met spectrum. Inspection of the EPR spectra of both [MnMn(EcMetAP-I)]-L-Met and [MnMn(PfMetAP-II)]-L-Met at 40 K in the parallel mode reveals that the [Mn(EcMetAP-I)]-L-Met spectrum exhibits a well-resolved hyperfine split pattern at g = 7.6 with a hyperfine splitting constant of A = 4.4 mT. These data suggest the presence of a magnetically coupled dinuclear Mn(II) center. On the other hand, a similar feature was not observed for the [MnMn(PfMetAP-II)]-L-Met complex. Therefore, the EPR data suggest that L-Met binds to [MnMn(EcMetAP-I)] differently than [MnMn(PfMetAP-II)]. To confirm these data, the X-ray crystal structure of [MnMn(PfMetAP-II)]-L-Met was solved to 2.3 A resolution. Both Mn1 and Mn2 reside in a distorted trigonal bipyramidal geometry, but the bridging water molecule, observed in the [CoCo(PfMetAP-II)] structure, is absent. Therefore, L-Met binding displaces this water molecule, but the carboxylate oxygen atom of L-Met does not bridge between the two Mn(II) ions. Instead, a single carboxylate oxygen atom of L-Met interacts with only Mn1, while the N-terminal amine nitrogen atom binds to M2. This L-Met binding mode is different from that observed for L-Met binding [CoCo(EcMetAP-I)]. Therefore, the catalytic mechanisms of type-I MetAPs may differ somewhat from type-II enzymes when a dinuclear metalloactive site is present.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322-0300, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Methionine aminopeptidase
A, B
295Pyrococcus furiosusMutation(s): 0 
EC: 3.4.11.18
UniProt
Find proteins for P56218 (Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1))
Explore P56218 
Go to UniProtKB:  P56218
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56218
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 
  • Space Group: P 64
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.01α = 90
b = 112.01β = 90
c = 122.96γ = 120
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-02-22
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description