The crystal structure of a trypsin-like mutant chymotrypsin

The role of position 226 in the activity and specificity of S189D chymotrypsin

Balázs Jelinek, Gergely Katona, Krisztián Fodor, I. Venekei, L. Gráf

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The crystal structure of the S189D+A226G rat chymotrypsin-B mutant has been determined at 2.2 Å resolution. This mutant is the most trypsin-like mutant so far in the line of chymotrypsin-to-trypsin conversions, aiming for a more complete understanding of the structural basis of substrate specificity in pancreatic serine proteases. A226G caused significant rearrangements relative to S189D chymotrypsin, allowing an internal conformation of Asp189 which is close to that in trypsin. Serious distortions remain, however, in the activation domain, including zymogen-like features. The pH-profile of activity suggests that the conformation of the S1-site of the mutant is influenced also by the P1 residue of the substrate.

Original languageEnglish
Pages (from-to)79-87
Number of pages9
JournalProtein Journal
Volume27
Issue number2
DOIs
Publication statusPublished - Feb 2008

Fingerprint

Chymotrypsin
Trypsin
Conformations
Crystal structure
Enzyme Precursors
Serine Proteases
Substrates
Substrate Specificity
Rats
Chemical activation
chymotrypsin B
trypsin drug combination chymotrypsin
Peptide Hydrolases

Keywords

  • Crystal structure
  • Position 226
  • Serine protease
  • Substrate specificity

ASJC Scopus subject areas

  • Biochemistry

Cite this

The crystal structure of a trypsin-like mutant chymotrypsin : The role of position 226 in the activity and specificity of S189D chymotrypsin. / Jelinek, Balázs; Katona, Gergely; Fodor, Krisztián; Venekei, I.; Gráf, L.

In: Protein Journal, Vol. 27, No. 2, 02.2008, p. 79-87.

Research output: Contribution to journalArticle

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