3GZH

Crystal structure of phosphate-bound adenylosuccinate lyase from E. coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structure of phosphate-bound Escherichia coli adenylosuccinate lyase identifies His171 as a catalytic acid.

Kozlov, G.Nguyen, L.Pearsall, J.Gehring, K.

(2009) Acta Crystallogr.,Sect.F 65: 857-861

  • DOI: 10.1107/S1744309109029674

  • PubMed Abstract: 
  • Adenylosuccinate lyase (ASL) is an enzyme from the purine-biosynthetic pathway that catalyzes the cleavage of 5-aminoimidazole-4-(N-succinylcarboxamide) ribonucleotide (SAICAR) to 5-aminoimidazole-4-carboxamide ribonucleotide (AICAR) and fumarate. AS ...

    Adenylosuccinate lyase (ASL) is an enzyme from the purine-biosynthetic pathway that catalyzes the cleavage of 5-aminoimidazole-4-(N-succinylcarboxamide) ribonucleotide (SAICAR) to 5-aminoimidazole-4-carboxamide ribonucleotide (AICAR) and fumarate. ASL is also responsible for the conversion of succinyladenosine monophosphate (SAMP) to adenosine monophosphate (AMP) and fumarate. Here, the crystal structure of adenylosuccinate lyase from Escherichia coli was determined to 1.9 A resolution. The enzyme adopts a substrate-bound conformation as a result of the presence of two phosphate ions bound in the active site. Comparison with previously solved structures of the apoenzyme and an SAMP-bound H171A mutant reveals a conformational change at His171 associated with substrate binding and confirms the role of this residue as a catalytic acid.


    Organizational Affiliation

    Department of Biochemistry, McGill University, Montreal, Quebec, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Adenylosuccinate lyase
A
482Escherichia coli O157:H7Mutation(s): 0 
Gene Names: purB
EC: 4.3.2.2
Find proteins for Q8X737 (Escherichia coli O157:H7)
Go to UniProtKB:  Q8X737
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

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Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
NA
Query on NA

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Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.170 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 77.316α = 90.00
b = 100.256β = 90.00
c = 150.104γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
REFMACrefinement
HKL-2000data reduction
PHASERphasing
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Source and taxonomy, Version format compliance