Hydrogenperoxide (H(2)O(2)) is an end product of diamine and polyamine oxidation by their respective oxidase enzymes. A new sensitive assay method is based on a H(2)O(2)-titanium (Ti) complex formation as an indicator of H(2)O(2) production due to polyamine oxidation. The orange-yellow coloured H(2)O(2)-Ti complex was measured at 410 nm in a Shimadzu spectrophotometer. The assay conditions for ...

The primary structure of mouse SVS I was determined by peptide sequencing and nucleotide sequencing of cloned cDNA. The precursor molecule consists of 820 amino acid residues, including a signal peptide of 24 residues, and the mature polypeptide chain of 91 kDa has one site for potential N-linked glycosylation. The SVS I is homologous with amiloride-binding protein 1 (ABP1), a diamine oxidase. ...

In contrast with putrescine (1,4-diaminobutane), which is a substrate of diamine oxidase, monoacetylputrescine is oxidatively deaminated both in vitro and in vivo by monoamine oxidase. The product of this reaction is N-acetyl-gamma-aminobutyrate. The existence of a degradative pathway in mammalian brain for putrescine is shown, which comprises acetylation of putrescine, oxidative deamination of...

Amine oxidases that occur in the plasma of mammals have been intensively studied in recent years (l-8). The ability of human plasma and serum to convert benzylamine to benzaldehyde has recently been demonstrated (9). Evidence has been presented to show that this enzymatic activity is different from other human plasma enzymes that catalyze the oxidation of amines (i.e. ceruloplasmin and diamine ...

The respiratory components of the envelope membrane preparation of Neisseria meningitidis were investigated. Oxidase activities were demonstrated in this fraction in the presence of succinic acid, reduced nicotinamide adenine dinucleotide, and ascorbate-N,N,N',N'-tetramethyl-p-phenylene-diamine (TMPD). Differences in the kinetics of inhibition by terminal oxidase inhibitors on the three oxidase...

Amine oxidases that occur in the plasma of mammals have been intensively studied in recent years (l-8). The ability of human plasma and serum to convert benzylamine to benzaldehyde has recently been demonstrated (9). Evidence has been presented to show that this enzymatic activity is different from other human plasma enzymes that catalyze the oxidation of amines (i.e. ceruloplasmin and diamine ...

Amine oxidases that occur in the plasma of mammals have been intensively studied in recent years (l-8). The ability of human plasma and serum to convert benzylamine to benzaldehyde has recently been demonstrated (9). Evidence has been presented to show that this enzymatic activity is different from other human plasma enzymes that catalyze the oxidation of amines (i.e. ceruloplasmin and diamine ...

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...

Extracts of rabbit liver and brain are known (1, 2) to oxidize pyridoxine 5-phosphate to pyridoxal 5-phosphate much faster than they oxidize free pyridoxine to pyridoxal. Comparison of the two activities during limited purification indicated that different enzymes catalyzed the two reactions (1). Pogell (3) had shown previously that oxidation of pyridoxamine 5-phosphate was catalyzed by an enzy...