Crystal structure of Escherichia coli thioesterase I/protease I/lysophospholipase L1: Consensus sequence blocks constitute the catalytic center of SGNH-hydrolases through a conserved hydrogen bond network

Yu Chih Lo, Su Chang Lin, Jei Fu Shaw, Yen Chywan Liaw

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)

Abstract

Escherichia coli thioesterase I (TAP) is a multifunctional enzyme possessing activities of thioesterase, esterase, arylesterase, protease, and lysophospholipase. In particular, TAP has stereoselectivity for amino acid derivative substrates, hence it is useful for the kinetic resolution of racemic mixtures of industrial chemicals. In the present work, the crystal structure of native TAP was determined at 1.9Å, revealing a minimal SGNH-hydrolase fold. The structure of TAP in complex with a diethyl phosphono moiety (DEP) identified its catalytic triad, Ser10-Asp154-His157, and oxyanion hole, Ser10-Gly44-Asn73. The oxyanion hole of TAP consists of three residues each separated from the other by more than 3.5Å, implying that all of them are highly polarized when substrate bound. The catalytic (His)Cε1-H⋯O=C hydrogen bond usually plays a role in the catalytic mechanisms of most serine hydrolases, however, there were none present in SGNH-hydrolases. We propose that the existence of the highly polarized tri-residue-constituted oxyanion hole compensates for the lack of a (His)Cε1-H⋯O=C hydrogen bond. This suggests that members of the SGNH-hydrolase family may employ a unique catalytic mechanism. In addition, most SGNH-hydrolases have low sequence identities and presently there is no clear criterion to define consensus sequence blocks. Through comparison of TAP and the three SGNH-hydrolase structures currently known, we have identified a unique hydrogen bond network which stabilizes the catalytic center: a newly discovered structural feature of SGNH-hydrolases. We have defined these consensus sequence blocks providing a basis for the sub-classification of SGNH-hydrolases.

Original languageEnglish
Pages (from-to)539-551
Number of pages13
JournalJournal of Molecular Biology
Volume330
Issue number3
DOIs
Publication statusPublished - 2003 Jul 11

All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Molecular Biology

Fingerprint Dive into the research topics of 'Crystal structure of Escherichia coli thioesterase I/protease I/lysophospholipase L<sub>1</sub>: Consensus sequence blocks constitute the catalytic center of SGNH-hydrolases through a conserved hydrogen bond network'. Together they form a unique fingerprint.

Cite this