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Enzymatic deamination of cytidine and adenosine bases in RNA have recently been shown to be mechanisms for changing the coding specificity of messenger and transfer RNAs. The structures of the enzymes that carry out deamination of the corresponding nucleosides have been analyzed by X-ray crystallography. They are quite different from one another in most respects, including quaternary and tertiary...
The course of the recovery of the active site conformation during refolding of urea-denatured creatine kinase (ATP:creatine N-phosphotransferase, EC 2.7.3.2) has been studied. The recovery of the active site conformation has been followed by changes in probe fluorescence of active site of the enzyme labeled by o-phthaldehyde and has been shown to be a triphasic process. A comparison of the rate constants...
New strains of basidiomycetes producing extracellular laccases (Trametes ochracea 92-78, and Trametes hirsuta 56) have been found by screening of isolates of Trametes fungi. The laccases from T. hirsuta 56 and T. ochracea 92-78 as well as two laccases from previously found and described strains of basidiomycetes, namely Cerrena maxima and Coriolopsis fulvocinerea, were purified to homogeneity. The...
A series of N,N′-bis(2-pyridinylmethyl)diamines was synthesized and characterized for their inhibition effects towards plant copper-containing amine oxidase (EC 1.4.3.6) and polyamine oxidase (EC 1.5.3.11), which mediate the catabolic regulation of cellular polyamines. Even though these enzymes catalyze related reactions and, among others, act upon two common substrates (spermidine and spermine),...
Many of the 181 families of peptidases contain homologues that are known to have functions other than peptide bond hydrolysis. Distinguishing an active peptidase from a homologue that is not a peptidase requires specialist knowledge of the important active site residues, because replacement or lack of one of these catalytic residues is an important clue that the homologue in question is unlikely to...
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