1BW0

CRYSTAL STRUCTURE OF TYROSINE AMINOTRANSFERASE FROM TRYPANOSOMA CRUZI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of Trypanosoma cruzi tyrosine aminotransferase: substrate specificity is influenced by cofactor binding mode.

Blankenfeldt, W.Nowicki, C.Montemartini-Kalisz, M.Kalisz, H.M.Hecht, H.J.

(1999) Protein Sci. 8: 2406-2417

  • DOI: 10.1110/ps.8.11.2406

  • PubMed Abstract: 
  • The crystal structure of tyrosine aminotransferase (TAT) from the parasitic protozoan Trypanosoma cruzi, which belongs to the aminotransferase subfamily Igamma, has been determined at 2.5 A resolution with the R-value R = 15.1%. T. cruzi TAT shares l ...

    The crystal structure of tyrosine aminotransferase (TAT) from the parasitic protozoan Trypanosoma cruzi, which belongs to the aminotransferase subfamily Igamma, has been determined at 2.5 A resolution with the R-value R = 15.1%. T. cruzi TAT shares less than 15% sequence identity with aminotransferases of subfamily Ialpha but shows only two larger topological differences to the aspartate aminotransferases (AspATs). First, TAT contains a loop protruding from the enzyme surface in the larger cofactor-binding domain, where the AspATs have a kinked alpha-helix. Second, in the smaller substrate-binding domain, TAT has a four-stranded antiparallel beta-sheet instead of the two-stranded beta-sheet in the AspATs. The position of the aromatic ring of the pyridoxal-5'-phosphate cofactor is very similar to the AspATs but the phosphate group, in contrast, is closer to the substrate-binding site with one of its oxygen atoms pointing toward the substrate. Differences in substrate specificities of T. cruzi TAT and subfamily Ialpha aminotransferases can be attributed by modeling of substrate complexes mainly to this different position of the cofactor-phosphate group. Absence of the arginine, which in the AspATs fixes the substrate side-chain carboxylate group by a salt bridge, contributes to the inability of T. cruzi TAT to transaminate acidic amino acids. The preference of TAT for tyrosine is probably related to the ability of Asn17 in TAT to form a hydrogen bond to the tyrosine side-chain hydroxyl group.


    Related Citations: 
    • Aromatic Amino Acid Transamination and Methionine Recycling in Trypanosomatids
      Berger, B.J.,Dai, W.W.,Wang, H.,Stark, R.E.,Cerami, A.
      (1996) Proc.Natl.Acad.Sci.USA 93: 4126
    • Crystallization and Preliminary X-Ray Analysis of Tyrosine Aminotransferase from Trypanosoma Cruzi Epimastigotes
      Nowicki, C.,Montemartini, M.,Hunter, G.R.,Blankenfeldt, W.,Hecht, H.J.
      (1998) Acta Crystallogr.,Sect.D 54: 105
    • Production of Aromatic Alpha-Hydroxyacids by Epimastigotes of Trypanosoma Cruzi, and its Possible Role in Nadh Reoxidation
      Montemartini, M.,Santome, J.A.,Cazzulo, J.J.,Nowicki, C.
      (1994) Fems Microbiol.Lett. 118: 89


    Organizational Affiliation

    Gesellschaft für Biotechnologische Forschung, Braunschweig, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (TYROSINE AMINOTRANSFERASE)
A, B
416Trypanosoma cruziEC: 2.6.1.5
Find proteins for P33447 (Trypanosoma cruzi)
Go to UniProtKB:  P33447
Small Molecules
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: 2.5 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.157 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.600α = 90.00
b = 102.200β = 110.30
c = 77.900γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
AMoREphasing
X-GENdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-09-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance