7TCS image
Entry Detail
PDB ID:
7TCS
Keywords:
Title:
M379A mutant tyrosine phenol-lyase complexed with L-methionine
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2021-12-28
Release Date:
2022-06-01
Method Details:
Experimental Method:
Resolution:
1.37 Å
R-Value Free:
0.15
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Tyrosine phenol-lyase
Mutations:M379A
Chain IDs:A, B, C, D
Chain Length:456
Number of Molecules:4
Biological Source:Citrobacter freundii
Primary Citation
M379A Mutant Tyrosine Phenol-lyase from Citrobacter freundii Has Altered Conformational Dynamics.
Chembiochem 23 e202200028 e202200028 (2022)
PMID: 35577764 DOI: 10.1002/cbic.202200028

Abstact

The M379A mutant of Citrobacter freundii tyrosine phenol-lyase (TPL) has been prepared. M379A TPL is a robust catalyst to prepare a number of tyrosines substituted at the 3-position with bulky groups that cannot be made with wild type TPL. The three dimensional structures of M379A TPL complexed with L-methionine and 3-bromo-DL-phenylalanine have been determined by X-ray crystallography. Methionine is bound as a quinonoid complex in a closed active site in 3 of 4 chains of homotetrameric M379A TPL. M379A TPL reacts with L-methionine about 8-fold slower than wild type TPL. The temperature dependence shows that the slower reaction is due to less positive activation entropy. The structure of the M379A TPL complex of 3-bromo-DL-phenylalanine has a quinonoid complex in two subunits, with an open active site conformation. The effects of the M379A mutation on TPL suggest that the mutant enzyme has altered the conformational dynamics of the active site.

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