L S Gennis

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  • L S Gennis
  • 1976
A three-step procedure including affinity chromatography on NAD+-azobenzamidopropyl-Sepharose has been designed for the purification of yeast glyceraldehyde-3-phosphate dehydrogenase [D-glyceraldehyde-3-phosphate: NAD+ oxidoreductase (phosphorylating), EC] with maximized specific activity and maximized homogeneity with respect to affinity for the(More)
Two new double-headed protease inhibitors have been isolated from black-eyed peas. The isoinhibitors can be purified to homogeneity with greater than 90% recovery in a four-step procedure by means of sequential affinity chromatography on trypsin-Sepharose and chymotrypsin-Sepharose affinity columns. The isoinhibitors both have molecular weights near 8,000(More)
Two new double-headed protease inhibitors from black-eyed peas have amino acid compositions typical of the low molecular weight protease inhibitors from legume seeds. Black-eyed pea chymotrypsin and trypsin inhibitor (BEPCI) contains no tryptophan, 1 tyrosine, and 14 half-cystines out of 83 amino acid residues per monomer. Black-eyed pea trypsin inhibitor(More)
The geometry of the binary and ternary complexes of two black-eyed pea inhibitors with trypsin and chymotrypsin has been established by distance measurements using the technique of singlet-singlet energy transfer. Triangulation of measured distances in the ternary double-headed complex of the trypsin-chymotrypsin inhibitor (BEPCI) with trypsin and(More)
Complex formation between two new double-headed protease inhibitors from black-eyed peas, trypsin-chymotrypsin inhibitor (BEPCI) and a trypsin inhibitor (BEPTI), and trypsin and chymotrypsin was investigated in the concentration range from 10-8 to 10-4 M by titration experiments and gel filtration chromatography. Dissociation equilibrium constants measured(More)
The chemical modification of two new double-headed-protease inhibitors from black-eyed peas, a trypsin-chymotrypsin inhibitor (BEPCI) and a trypsin inhibitor (BEPTI) with dansyl chloride was investigated under various conditions. The NH2-terminal serine of both BEPCI and BEPTI, the 4 lysyl residues of BEPCI, and 4 of the 5 lysyl residues of BEPTI, could not(More)
The half-site reactivity of trypsin and chymotrypsin binding to two double-headed black-eyed pea protease inhibitors a trypsin-chymotrypsin inhibitor (BEPCI) had a trypsin inhibitor (BEPTI), is explained in terms of the energetics of these inhibitor-protease interactions. Free energy diagrams are constructed to facilitate interpretation of the energetics.(More)
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