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Journal of Protein Chemistry

, Volume 19, Issue 2, pp 75–84 | Cite as

Some Molecular and Enzymatic Properties of a Homogeneous Preparation of Thiaminase I Purified from Carp Liver

  • Małgorzata Boś
  • Andrzej Kozik
Article

Abstract

A homogeneous preparation of thiaminase I (thiamine:base 2-methyl-4-aminopyrimidine-5-methenyl transferase, EC 2.5.1.2) was obtained from carp liver, for the first time from a nonbacterial source. Its molecular mass was 55 kDa by gel filtration and by SDS—PAGE regardless the presence of the reducing agent, indicating that the native enzyme consists of a single polypeptide chain. The determined sequence of 20 residues at the N-terminal of carp thiaminase I seemed to be unique. The enzyme was tested for ability to decompose a number of thiamine analogues. Even very extensive modifications of the thiazolium fragment were well tolerated, but around the pyrimidine fragment the active center seemed to exert steric restrictions against 1′ (N)- and 2′ (C)- atoms, while the 4′-amino group and untouched 6′-carbon atom were absolutely essential for the enzyme action. Numerous nucleophiles could be used by the enzyme as cosubstrates, aniline, pyridine, and 2-mercaptoethanol being the best among compounds tested. Protein chemical modification experiments indicated that histidine residues, carboxyl groups, and sulfhydryl groups may play specific roles in the thiaminase I-catalyzed reaction. Like in the bacterial enzyme, a sulfhydryl group may be a catalytically critical active-site nucleophile. The histidine residues and carboxyl groups may be essential for thiamine binding to the active site.

Thiaminase I thiamine analogues chemical modification sulfhydryl groups carp liver 

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Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • Małgorzata Boś
    • 1
  • Andrzej Kozik
    • 1
  1. 1.Department of Biochemistry, The Jan Zurzycki Institute of Molecular BiologyJagiellonian UniversityKrakówPoland

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