1ZOI

Crystal Structure of a Stereoselective Esterase from Pseudomonas putida IFO12996

Summary for 1ZOI

• Entry DOI: 10.2210/pdb1zoi/pdb
• Descriptor: esterase (2 entities in total)
• Functional Keywords: esterase, pseudomonas putida, alpha/beta hydrolase fold, hydrolase
• Biological source: Pseudomonas putida
• Total number of polymer chains: 3
• Total formula weight: 90605.60

Authors

Elmi, F.,Lee, H.T.,Huang, J.Y.,Hsieh, Y.C.,Wang, Y.L.,Chen, Y.J.,Shaw, S.Y.,Chen, C.J. (deposition date: 2005-05-13, release date: 2006-05-02, Last modification date: 2024-03-13)

Primary citation

Elmi, F.,Lee, H.T.,Huang, J.Y.,Hsieh, Y.C.,Wang, Y.L.,Chen, Y.J.,Shaw, S.Y.,Chen, C.J.
Stereoselective esterase from Pseudomonas putida IFO12996 reveals alpha/beta hydrolase folds for D-beta-acetylthioisobutyric acid synthesis
J.Bacteriol., 187:8470-8476, 2005

PubMed Abstract: Esterase (EST) from Pseudomonas putida IFO12996 catalyzes the stereoselective hydrolysis of methyl dl-beta-acetylthioisobutyrate (dl-MATI) to produce d-beta-acetylthioisobutyric acid (DAT), serving as a key intermediate for the synthesis of angiotensin-converting enzyme inhibitors. The EST gene was cloned and expressed in Escherichia coli; the recombinant protein is a non-disulfide-linked homotrimer with a monomer molecular weight of 33,000 in both solution and crystalline states, indicating that these ESTs function as trimers. EST hydrolyzed dl-MATI to produce DAT with a degree of conversion of 49.5% and an enantiomeric excess value of 97.2% at an optimum pH of about 8 to 10 and an optimum temperature of about 57 to 67 degrees C. The crystal structure of EST has been determined by X-ray diffraction to a resolution of 1.6 A, confirming that EST is a member of the alpha/beta hydrolase fold superfamily of enzymes and includes a catalytic triad of Ser97, Asp227, and His256. The active site is located approximately in the middle of the molecule at the end of a pocket approximately 12 A deep. EST can hydrolyze the methyl ester group without affecting the acetylthiol ester moiety in dl-MATI. The examination of substrate specificity of EST toward other linear esters revealed that the enzyme showed specific activity toward methyl esters and that it recognized the configuration at C-2.

PubMed: 16321951
DOI: 10.1128/JB.187.24.8470-8476.2005

Experimental method

X-RAY DIFFRACTION (1.6 Å)