1BPN

DIFFERENTIATION AND IDENTIFICATION OF THE TWO CATALYTIC METAL BINDING SITES IN BOVINE LENS LEUCINE AMINOPEPTIDASE BY X-RAY CRYSTALLOGRAPHY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Work: 0.188 

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This is version 1.2 of the entry. See complete history


Literature

Differentiation and identification of the two catalytic metal binding sites in bovine lens leucine aminopeptidase by x-ray crystallography.

Kim, H.Lipscomb, W.N.

(1993) Proc Natl Acad Sci U S A 90: 5006-5010

  • DOI: 10.1073/pnas.90.11.5006
  • Primary Citation of Related Structures:  
    1BPN, 1BPM

  • PubMed Abstract: 
  • The tightly binding and readily exchanging metal binding sites in the active site of bovine lens leucine aminopeptidase (blLAP; EC 3.4.11.1) have been differentiated and identified by x-ray crystallography. In native blLAP,Zn2+ occupies both binding sites ...

    The tightly binding and readily exchanging metal binding sites in the active site of bovine lens leucine aminopeptidase (blLAP; EC 3.4.11.1) have been differentiated and identified by x-ray crystallography. In native blLAP,Zn2+ occupies both binding sites. In solution, site 1 readily exchanges Zn2+ for other divalent cations, including Mg2+. The Zn2+ in site 2 is unavailable for metal exchange under conditions which allow exchange at site 1. The Zn2+/Mg2+ metal hybrid of blLAP (Mg-blLAP) was prepared in solution and crystallized. X-ray diffraction data to 2.9-A resolution were collected at -150 degrees C from single crystals of Mg-blLAP and native blLAP. Comparisons of omit maps calculated from the Mg-blLAP data with analogous maps calculated from the native blLAP data show electron density in one of the metal binding sites in Mg-blLAP which is much weaker than the electron density in the other binding site. Since there are fewer electrons associated with Mg2+ than with Zn2+, the difference in electron density between the two metal binding sites is consistent with occupancy of the weaker electron density site by Mg2+ and identifies this metal binding site as site 1, defined as the readily exchanging site. The present identification of the metal binding sites reverses the previous presumptive assignment of the metal binding sites which was based on the structure of native blLAP [Burley, S. K., David, P. R., Sweet, R. M., Taylor, A. & Lipscomb, W. N. (1992) J. Mol. Biol. 224, 113-140]. According to the residue-numbering convention of native blLAP, the new assignment of the metal binding sites identifies the readily exchanging site 1 with Zn-488, which is within interaction distance of one side-chain carboxylate oxygen from each of Asp-255, Asp-332, and Glu-334 and the main-chain carbonyl oxygen of Asp-332. The more tightly binding site 2 is identified with Zn-489, which is within interaction distance of one side-chain carboxylate oxygen from each of Asp-255, Asp-273, and Glu-334 and the side-chain amine nitrogen of Lys-250.


    Related Citations: 
    • Structure Determination and Refinement of Bovine Lens Leucine Aminopeptidase and its Complex with Bestatin
      Burley, S.K., David, P.R., Sweet, R.M., Taylor, A., Lipscomb, W.N.
      (1992) J Mol Biol 224: 113
    • Molecular Structure of Leucine Aminopeptidase at 2.7-Angstroms Resolution
      Burley, S.K., David, P.R., Taylor, A., Lipscomb, W.N.
      (1990) Proc Natl Acad Sci U S A 87: 6878

    Organizational Affiliation

    Gibbs Chemical Laboratory, Harvard University, Cambridge, MA 02138.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LEUCINE AMINOPEPTIDASEA487Bos taurusMutation(s): 0 
Gene Names: LAP3
EC: 3.4.11.1 (PDB Primary Data), 3.4.13.23 (UniProt), 3.4.11.5 (UniProt)
UniProt
Find proteins for P00727 (Bos taurus)
Explore P00727 
Go to UniProtKB:  P00727
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Work: 0.188 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.8α = 90
b = 129.8β = 90
c = 120.7γ = 120
Software Package:
Software NamePurpose
X-PLORrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-07-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance