1GQ6

PROCLAVAMINATE AMIDINO HYDROLASE FROM STREPTOMYCES CLAVULIGERUS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.142 

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This is version 1.1 of the entry. See complete history. 


Literature

Oligomeric Structure of Proclavaminic Acid Amidino Hydrolase: Evolution of a Hydrolytic Enzyme in Clavulanic Acid Biosynthesis

Elkins, J.M., Clifton, I.J., Hernandez, H., Doan, L.X., Robinson, C.V., Schofield, C.J., Hewitson, K.S.

(2002) Biochem J 366: 423

  • DOI: 10.1042/BJ20020125
  • Primary Citation of Related Structures:  
    1GQ6, 1GQ7

  • PubMed Abstract: 

    • During biosynthesis of the clinically used beta-lactamase inhibitor clavulanic acid, one of the three steps catalysed by clavaminic acid synthase is separated from the other two by a step catalysed by proclavaminic acid amidino hydrolase (PAH), in which the guanidino group of an intermediate is hydrolysed to give proclavaminic acid and urea ...

    During biosynthesis of the clinically used beta-lactamase inhibitor clavulanic acid, one of the three steps catalysed by clavaminic acid synthase is separated from the other two by a step catalysed by proclavaminic acid amidino hydrolase (PAH), in which the guanidino group of an intermediate is hydrolysed to give proclavaminic acid and urea. PAH shows considerable sequence homology with the primary metabolic arginases, which hydrolyse arginine to ornithine and urea, but does not accept arginine as a substrate. Like other members of the bacterial sub-family of arginases, PAH is hexameric in solution and requires Mn2+ ions for activity. Other metal ions, including Co2+, can substitute for Mn2+. Two new substrates for PAH were identified, N-acetyl-(L)-arginine and (3R)-hydroxy-N-acetyl-(L)-arginine. Crystal structures of PAH from Streptomyces clavuligerus (at 1.75 A and 2.45 A resolution, where 1 A=0.1 nm) imply how it binds beta-lactams rather than the amino acid substrate of the arginases from which it evolved. The structures also suggest how PAH selects for a particular alcohol intermediate in the clavam biosynthesis pathway. As observed for the arginases, each PAH monomer consists of a core of beta-strands surrounded by alpha-helices, and its active site contains a di-Mn2+ centre with a bridging water molecule responsible for hydrolytic attack on to the guanidino group of the substrate. Comparison of structures obtained under different conditions reveals different conformations of a flexible loop, which must move to allow substrate binding.

    Organizational Affiliation: 

    The Dyson Perrins Laboratory, Oxford Centre for Molecular Sciences, South Parks Road, Oxford OX1 3QY, UK.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROCLAVAMINATE AMIDINO HYDROLASEA, B, C313Streptomyces clavuligerusMutation(s): 0 
Gene Names: pah
EC: 3.5.3.11 (PDB Primary Data), 3.5.3.22 (UniProt)
UniProt
Find proteins for P0DJQ3 (Streptomyces clavuligerus)
Explore P0DJQ3 
Go to UniProtKB:  P0DJQ3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.142 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.859α = 90
b = 78.931β = 123.9
c = 93.199γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-06-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance