1F2O

CRYSTAL STRUCTURE OF THE STREPTOMYCES GRISEUS AMINOPEPTIDASE COMPLEXED WITH L-LEUCINE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.147 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Interactions of Streptomyces griseus aminopeptidase with amino acid reaction products and their implications toward a catalytic mechanism.

Gilboa, R.Spungin-Bialik, A.Wohlfahrt, G.Schomburg, D.Blumberg, S.Shoham, G.

(2001) Proteins 44: 490-504

  • Primary Citation of Related Structures:  1F2P

  • PubMed Abstract: 
  • Streptomyces griseus aminopeptidase (SGAP) is a double-zinc exopeptidase with a high preference toward large hydrophobic amino-terminus residues. It is a monomer of a relatively low molecular weight (30 kDa), it is heat stable, it displays a high and ...

    Streptomyces griseus aminopeptidase (SGAP) is a double-zinc exopeptidase with a high preference toward large hydrophobic amino-terminus residues. It is a monomer of a relatively low molecular weight (30 kDa), it is heat stable, it displays a high and efficient catalytic turnover, and its activity is modulated by calcium ions. The small size, high activity, and heat stability make SGAP a very attractive enzyme for various biotechnological applications, among which is the processing of recombinant DNA proteins and fusion protein products. Several free amino acids, such as phenylalanine, leucine, and methionine, were found to act as weak inhibitors of SGAP and hence were chosen for structural studies. These inhibitors can potentially be regarded as product analogs because one of the products obtained in a normal enzymatic reaction is the cleaved amino terminal amino acid of the substrate. The current study includes the X-ray crystallographic analysis of the SGAP complexes with methionine (1.53 A resolution), leucine (1.70 A resolution), and phenylalanine (1.80 A resolution). These three high-resolution structures have been used to fully characterize the SGAP active site and to identify some of the functional groups of the enzyme that are involved in enzyme-substrate and enzyme-product interactions. A unique binding site for the terminal amine group of the substrate (including the side chains of Glu131 and Asp160, as well as the carbonyl group of Arg202) is indicated to play an important role in the binding and orientation of both the substrate and the product of the catalytic reaction. These studies also suggest that Glu131 and Tyr246 are directly involved in the catalytic mechanism of the enzyme. Both of these residues seem to be important for substrate binding and orientation, as well as the stabilization of the tetrahedral transition state of the enzyme-substrate complex. Glu131 is specifically suggested to function as a general base during catalysis by promoting the nucleophilic attack of the zinc-bound water/hydroxide on the substrate carbonyl carbon. The structures of the three SGAP complexes are compared with recent structures of three related aminopeptidases: Aeromonas proteolytica aminopeptidase (AAP), leucine aminopeptidase (LAP), and methionine aminopeptidase (MAP) and their complexes with corresponding inhibitors and analogs. These structural results have been used for the simulation of several species along the reaction coordinate and for the suggestion of a general scheme for the proteolytic reaction catalyzed by SGAP.


    Related Citations: 
    • Interactions of Streptomyces griseus Aminopeptidase with a Methionine Product Analogue: a Structural Study at 1.53 A Resolution.
      Gilboa, R.,Greenblatt, H.M.,Perach, M.,Spungin-Bialik, A.,Lessel, U.,Wohlfahrt, G.,Schomburg, D.,Blumberg, S.,Shoham, G.
      (2000) Acta Crystallogr.,Sect.D 56: 551
    • Inhibition of Streptomyces griseus Aminopeptidase and Effects of Calcium Ions on Catalysis and Binding--Comparisons with the Homologous Enzyme Aeromonas Proteolytica Aminopeptidase.
      Papir, G.,Spungin-Bialik, A.,Ben-Meir, D.,Fudim, E.,Gilboa, R.,Greenblatt, H.M.,Shoham, G.,Lessel, U.,Schomburg, D.,Ashkenazi, R.,Blumberg, S.
      (1998) Eur.J.Biochem. 258: 313
    • Streptomyces griseus Aminopeptidase: X-ray Crystallographic Structure at 1.75A Resolution.
      Greenblatt, H.M.,Almog, O.,Maras, B.,Spungin-Bialik, A.,Barra, D.,Blumberg, S.,Shoham, G.
      (1997) J.Mol.Biol. 265: 620


    Organizational Affiliation

    Department of Inorganic Chemistry and the Laboratory for Structural Chemistry and Biology, The Hebrew University of Jerusalem, Jerusalem, Israel.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AMINOPEPTIDASE
A
284Streptomyces griseus subsp. griseus (strain JCM 4626 / NBRC 13350)EC: 3.4.11.24
Find proteins for P80561 (Streptomyces griseus subsp. griseus (strain JCM 4626 / NBRC 13350))
Go to UniProtKB:  P80561
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
LEU
Query on LEU

Download SDF File 
Download CCD File 
A
LEUCINE
C6 H13 N O2
ROHFNLRQFUQHCH-YFKPBYRVSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
LEUKi: 12400000 nM BINDINGMOAD
LEUKi: 12400000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.175 
  • R-Value Work: 0.147 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 61.990α = 90.00
b = 61.990β = 90.00
c = 146.870γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSphasing
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-08-22
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance