1BJW

ASPARTATE AMINOTRANSFERASE FROM THERMUS THERMOPHILUS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of Thermus thermophilus HB8 aspartate aminotransferase and its complex with maleate.

Nakai, T.Okada, K.Akutsu, S.Miyahara, I.Kawaguchi, S.Kato, R.Kuramitsu, S.Hirotsu, K.

(1999) Biochemistry 38: 2413-2424

  • DOI: 10.1021/bi9819881
  • Primary Citation of Related Structures:  1BKG

  • PubMed Abstract: 
  • The three-dimensional structures of pyridoxal 5'-phosphate-type aspartate aminotransferase (AspAT) from Thermus thermophilus HB8 and pyridoxamine 5'-phosphate type one in complex with maleate have been determined by X-ray crystallography at 1.8 and 2 ...

    The three-dimensional structures of pyridoxal 5'-phosphate-type aspartate aminotransferase (AspAT) from Thermus thermophilus HB8 and pyridoxamine 5'-phosphate type one in complex with maleate have been determined by X-ray crystallography at 1.8 and 2.6 A resolution, respectively. The enzyme is a homodimer, and the polypeptide chain of the subunit is folded into one arm, one small domain, and one large domain. AspATs from many species were classified into aminotransferase subgroups Ia and Ib. The enzyme belongs to subgroup Ib, its sequence being less than 16% identical to the primary sequences of Escherichia coli, pig cytosolic, and chicken mitochondrial AspATs, which belong to subgroup Ia whose sequences are more than 40% identical and whose three-dimensional structures are quite similar with the active site residues almost completely conserved. The first X-ray analysis of AspAT subgroup Ib indicated that the overall and the active site structures are essentially conserved between the AspATs of subgroup Ia and the enzyme of subgroup Ib, but there are two distinct differences between them. (1) In AspAT subgroup Ia, substrate (or inhibitor) binding induces a large movement of the small domain as a whole to close the active site. However, in the enzyme of subgroup Ib, only the N-terminal region (Lys13-Val30) of the small domain approaches the active site to interact with the maleate. (2) In AspAT subgroup Ia, Arg292 recognizes the side chain carboxylate of the substrate; however, residue 292 of the enzyme in subgroup Ib is not Arg, and in place of Arg292, Lys109 forms a salt bridge with the side chain carboxylate. The thermostability of the enzyme is attained at least in part by the high content of Pro residues in the beta-turns and the marked increase in the number of salt bridges on the molecular surface compared with the mesophilic AspAT.


    Organizational Affiliation

    Department of Chemistry, Graduate School of Science, Osaka City University, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ASPARTATE AMINOTRANSFERASE
A, B
382Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Gene Names: aspC
EC: 2.6.1.1
Find proteins for Q56232 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q56232
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LLP
Query on LLP
A, B
L-PEPTIDE LINKINGC14 H22 N3 O7 PLYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.215 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 61.600α = 90.00
b = 113.860β = 90.00
c = 124.400γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORphasing
SCALEPACKdata scaling
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-07-22
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance