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Amino acid sequence of an active fragment of potato proteinase inhibitor IIa.

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The complete amino acid sequence of an active fragment of potato proteinase inhibitor IIa has been established by the Edman degradation procedure and the carboxypeptidase technique. Sequence analyses were carried out on the reduced and carboxymethylated active fragment and its tryptic peptides. To

Homologous inhibitors from potato tubers of serine endopeptidases and metallocarboxypeptidases.

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A potent polypeptide inhibitor of chymotrypsin has been purified from Russett Burbank potatoes. The inhibitor has no effect on bovine carboxypeptidases A or B but exhibits homology with a carboxypeptidase inhibitor that is also present in potato tubers. The chymotrypsin inhibitor has a molecular

The purification and properties of the lectin from potato tubers, a hydroxyproline-containing glycoprotein.

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1. Potato lectin has been purified and shown to be a glycoprotein containing about 50% of carbohydrate. Most of the sugar residues (92%) are arabinose; small amounts of galactose, glucose and glucosamine are also present. 2. The most abundant amino acid is hydroxyproline (16% of the residues), 11.5%

Amino acid sequence of an active fragment of potato proteinase inhibitor IIb.

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The amino acid sequence of an active fragment of potato proteinase inhibitor IIb was determined by the Edman degradation procedure and the carboxypeptidase technique. Analyses were carried out on peptides derived from the reduced and carboxymethylated active fragment by digestion with trypsin and

Reduction and carboxamidomethylation of the single disulfide bond of proteinase inhibitor I from potato tubers. Effects on stability, immunological properties, and inhibitory activities.

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The single disulfide bond in potato Inhibitor I protomers (Mr = 8,000) was reduced and alkylated in the absence of denaturants to the carboxamidomethyl cysteine derivative. Two half-cystines per mol of inhibitor protomer were modified as determined by (a) loss of two sulfhydryl groups per reduced

Structure of potato carboxypeptidase inhibitor: disulfide pairing and exposure of aromatic residues.

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The determination of the covalent structure of a carboxypeptidase inhibitor from potatoes containing 39 amino acid residues has been completed by analysis of the pairing of the six half-cystine residues. Since the native inhibitor is resistant to fragmentation by proteases, the protein was first

Effects of guanidine hydrochloride and high pressure on subsite flexibility of beta-amylase.

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We investigated the effects of guanidine hydrochloride (GuHCl) and high pressure on the conformational flexibility of the active site of sweet potato beta-amylase by monitoring the sulfhydryl reaction and the enzymatic activity. The reactivity of Cys345 at the active site, one of six inert half

Property and amino acid sequence of a subtilisin inhibitor from seeds of beach canavalia (Canavalia lineata).

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A subtilisin inhibitor was purified from the seeds of Canavalia lineata by ammonium sulfate precipitation, ultrafiltration on a YM-30 membrane, column chromatography on DEAE-Toyopearl and SP-Toyopearl, followed by reverse-phase HPLC. The inhibitor (CLSI-I) is a low molecular weight protein (M(r)

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