Crystal structure of EstSRT1, a family VIII carboxylesterase displaying hydrolytic activity toward oxyimino cephalosporins

Sun Shin Cha, Young Jun An

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

EstSRT1 is a family VIII carboxylesterase that hydrolyzes oxyimino third- and fourth-generation cephalosporins, first-generation cephalosporins and ester substrates. According to the crystal structure of EstSRT1 (2.0-Å resolution), this protein contains a large α/β domain and a small α-helical domain and harbors three catalytic residues (Ser71, Lys74, and Tyr160) in the cavity at the domain interface, similarly to other family VIII carboxylesterases. Comparison of the structures of EstSRT1 and EstU1, a family VIII carboxylesterase with no hydrolytic activity toward bulky oxyimino cephalosporins, revealed that EstSRT1 has a smaller active site, despite its extended substrate range. The B-factors of the active site segments that could potentially contact with the oxyimino groups and the R2 side chains of oxyimino cephalosporins are higher in EstSRT1 than in EstU1, thus suggesting the role of the active site's structural flexibility in the extension of EstSRT1's substrate spectrum.

Original languageEnglish
Pages (from-to)818-824
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume478
Issue number2
DOIs
StatePublished - 16 Sep 2016

Keywords

  • Crystal structure
  • EstSRT1
  • Extended hydrolytic activity toward oxyimino cephalosporins
  • Family VIII carboxylesterases
  • Flexibility of the active site

Fingerprint

Dive into the research topics of 'Crystal structure of EstSRT1, a family VIII carboxylesterase displaying hydrolytic activity toward oxyimino cephalosporins'. Together they form a unique fingerprint.

Cite this