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Subtilisin Protein Inhibitor from Potato Tubers

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Abstract

A protein with molecular weight of 21 kD denoted as PKSI has been isolated from potato tubers (Solanum tuberosum L., cv. Istrinskii). The isolation procedure includes precipitation with (NH4)2SO4, gel chromatography on Sephadex G-75, and ion-exchange chromatography on CM-Sepharose CL-6B. The protein effectively inhibits the activity of subtilisin Carlsberg (K i = 1.67 ± 0.2 nM) by stoichiometric complexing with the enzyme at the molar ratio of 1 : 1. The inhibitor has no effect on trypsin, chymotrypsin, and the cysteine proteinase papain. The N-terminal sequence of the protein consists of 19 amino acid residues and is highly homologous to sequences of the known inhibitors from group C of the subfamily of potato Kunitz-type proteinase inhibitors (PKPIs-C). By cloning PCR products from the genomic DNA of potato, a gene denoted as PKPI-C2 was isolated and sequenced. The N-terminal sequence (residues from 15 to 33) of the protein encoded by the PKPI-C2 gene is identical to the N-terminal sequence (residues from 1 to 19) of the isolated protein PKSI. Thus, the inhibitor PKSI is very likely encoded by this gene.

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Authors and Affiliations

  1. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071, Russia

    T. A. Revina, A. S. Speranskaya, G. V. Kladnitskaya, A. B. Shevelev & T. A. Valueva

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  1. T. A. Revina
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  2. A. S. Speranskaya
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  3. G. V. Kladnitskaya
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  4. A. B. Shevelev
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  5. T. A. Valueva
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Revina, T.A., Speranskaya, A.S., Kladnitskaya, G.V. et al. Subtilisin Protein Inhibitor from Potato Tubers. Biochemistry (Moscow) 69, 1092–1098 (2004). https://doi.org/10.1023/B:BIRY.0000046882.99647.21

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  • DOI: https://doi.org/10.1023/B:BIRY.0000046882.99647.21

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