A novel variant of the catalytic triad in the streptomyces scabies esterase

Yunyi Wei, Janet L. Schottel, Urszula Derewenda, Lora Swenson, Shamkant Patkar, Zygmunt S. Derewenda

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137 Scopus citations


The crystal structure of a novel esterase from Streptomyces scabies, a causal agent of the potato scab disease, was solved at 2.1 Å resolution. The tertiary fold of the enzyme is substantially different from that of the α/β hydrolase family and unique among all known hydrolases. The active site contains a dyad of Ser 14 and His 283, closely resembling two of the three components of typical Ser-His- Asp(Glu) triads from other serine hydrolases. Proper orientation of the active site imidazol is maintained by a hydrogen bond between the Nδ-H group and a main chain oxygen. Thus, the enzyme constitutes the first known natural variation of the chymotrypsin-like triad in which a carboxylic acid is replaced by a neutral hydrogen-bond acceptor.

Original languageEnglish (US)
Pages (from-to)218-223
Number of pages6
JournalNature Structural Biology
Issue number3
StatePublished - Mar 1995


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