The substrate specificity of pepsin C

The Specificity of Pepsin

Substrate specificity of protein kinase C inhibitors.

In the August issue of TiPS, Epand and Lester analysed the effect of the physicochemical properties of the membrane on protein kinase C activity. In addition to those substrates discussed that require the presence of Ca2+ and phospholipids, other substrates can be phosphorylated in the absence of these activators. It is possible that this differential substrate requirement could be exploited ph...

The substrate binding site of pepsin.

In earlier reports from this laboratory, a series of new synthetic substrates for pepsin was described.'-' These compounds are of the general type Z-His-X-YOAI\e4 where X and Y are the residues of amino acids such as L-phenylalanine, p-nitro-L-phenylalanine, L-tyrosine, L-tryptophan, and L-leucine; the enzymic action is limited to the cleavage of the X-Y bond. One of the substrate analogues pre...

The substrate specificity of fumarase.

The substrate specificity of fumarase has been studied by measuring the ability of the enzyme to hydrate or dehydrate derivatives of fumarate and L-malate. Fumarase was observed to hydrate fumarate and its derivatives in the order, fluorofumarate > fumarate > chlorofumarate > bromofumarate > acetylenedicarboxylate > iodofumarate > mesaconate. With the exception of fluorofumarate, water was adde...

On the specificity of human gastricsin and pepsin.

Digests of oxidized ribonuclease A and glucagon with human gastricsin and pepsin have been compared with IR-120 B column chromatography and two-dimensional high voltage paper electrophoresis to separate the resulting peptides. The amino-terminal residues and the amino acid compositions of purified peptides were determined in order to establish the sequence of peptides and hence the sites of cle...