A chestnut seed cystatin differentially effective against cysteine proteinases from closely related pests

Plant Molecular Biology - Tập 38 Số 6 - Trang 1235-1242 - 1998
Pernas, Monica1, Sánchez-Monge, Rosa1, Gómez, Luis2, Salcedo, Gabriel1
1Unidad de Bioquimica, E.T.S. Ingenieros Agrónomos, Ciudad Universitaria, Madrid, Spain
2Unidad de Química y Bioquímica, E.T.S. Ingenieros Montes, Ciudad Universitaria, Madrid, Spain

Tóm tắt

Cystatin CsC, a cysteine proteinase inhibitor from chestnut (Castanea sativa) seeds, has been purified and characterized. Its full-length cDNA clone was isolated from an immature chestnut cotyledon library. The inhibitor was expressed in Escherichia coli and purified from bacterial extracts. Identity of both seed and recombinant cystatin was confirmed by matrix-assisted laser desorption/ionization mass spectrometry analysis, two-dimensional electrophoresis and N-terminal sequencing. CsC has a molecular mass of 11 275 Da and pI of 6.9. Its amino acid sequence includes all three motifs that are thought to be essential for inhibitory activity, and shows significant identity to other phytocystatins, especially that of cowpea (70%). Recombinant CsC inhibited papain (Ki 29 nM), ficin (Ki 65 nM), chymopapain (Ki 366 nM), and cathepsin B (Ki 473 nM). By contrast with most cystatins, it was also effective towards trypsin (Ki 3489 nM). CsC is active against digestive proteinases from the insect Tribolium castaneum and the mite Dermatophagoides farinae, two important agricultural pests. Its effects on the cysteine proteinase activity of two closely related mite species revealed the high specificity of the chestnut cystatin.

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Plant Molecular Biology

Tập 38 Số 6

1235-1242

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