Evaluation of the Moonlighting Histone H3 Specific Protease (H3ase) Activity and the Dehydrogenase Activity of Glutamate Dehydrogenase (GDH).

The N-terminus of Histone H3 is proteolytically processed in aged chicken liver. A histone H3 N-terminus specific endopeptidase (named H3ase) has been purified from the nuclear extract of aged chicken liver. By sequencing and a series of biochemical methods including the demonstration of H3ase activity in bacterially expressed GDH, it was established that the H3ase activity was a moonlighting protease activity of glutamate dehydrogenase (GDH).

Purification and characterization of a novel histone H2A specific protease (H2Asp) from chicken liver nuclear extract.

The proteolysis of the N- or the C-terminal tails of histones have recently emerged as a novel form of irreversible posttranslational modifications of histones. However, there are very few reports describing purification of a histone specific protease. Here, we report a histone H2A specific protease (H2Asp) activity in the chicken liver nuclear extract.

Characterization of nuclear glutamate dehydrogenase of chicken liver and brain.

Glutamate dehydrogenase (GDH) enzyme is recently being reported to be present in the nucleus in addition to the mitochondria in a number of organisms. Here we investigated the distribution of GDH in liver and brain tissues of chicken. Polyclonal anti-GDH antibody against bovine GDH was raised by us, which was later shown to be immunereactive to chicken GDH.

Strain improvement for tannase production from co-culture of Aspergillus foetidus and Rhizopus oryzae.

Spores from the co-culture of Aspergillus foetidus and Rhizopus oryzae were subjected to UV, heat and NTG (3-nitro,5-methylguanidine) mutagenesis. A few colonies were screened from the selected media for tannase study. Amongst all, the best mutant isolated from the heat treatment (60 degrees C for 60 min) was SCPR 337.