Open AccessEnhancement of Glutamic-Pyruvic Transaminase Activity in Leptospirae by Addition of Rabbit Serum
Author(s) -
Ichiji Mifuchi,
Masaharu Hosoi,
Tadashi Yamashita
Publication year - 1970
Publication title -
infection and immunity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.508
H-Index - 220
eISSN - 1070-6313
pISSN - 0019-9567
DOI - 10.1128/iai.1.3.215-218.1970
Subject(s) - transaminase , leptospira , biology , microbiology and biotechnology , pyruvic acid , pyridoxal , cofactor , pyridoxal phosphate , biochemistry , enzyme , serotype
Glutamic-pyruvic transaminase (GPT) in leptospirae was shown to have an optimal temperature of 30 C and pH 8.0. It was activated by cofactor pyridoxal phosphate, similar to GPT from other sources. However, GPT in all leptospirae, such as Leptospira canicola, L. icterohaemorrhagiae, L. autumnalis, and L. biflexa, evidently had less activity even when pyridoxal phosphate was present, in comparison with the cultivable spirochete Reiter treponeme and Streptococcus faecalis. The low level of activity of leptospiral GPT was enhanced more than 2.5-fold by the addition of about 10% rabbit serum, whereas GPT of S. faecalis did not show such enhancement. Enhancement of leptospiral GPT was greater with rabbit serum than with bovine or horse serum.