Biochemical properties of a bacterially-expressed Bowman-Birk inhibitor from Rhynchosia sublobata (Schumach.) Meikle seeds and its activity against gut proteases of Achaea janata
OAR@ICRISAT
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Relation |
http://oar.icrisat.org/10771/
http://dx.doi.org/10.1016/j.phytochem.2018.02.009 10.1016/j.phytochem.2018.02.009 |
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Title |
Biochemical properties of a bacterially-expressed Bowman-Birk inhibitor from Rhynchosia sublobata (Schumach.) Meikle seeds and its activity against gut proteases of Achaea janata
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Creator |
Mohanraj, S S
Tetali, S D Mallikarjuna, N Dutta-Gupta, A Padmasree, K |
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Subject |
Helicoverpa
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Description |
Crude proteinase inhibitors (CPIs) extracted from the seeds of Rhynchosia sublobata, a wild relative of pigeon pea showed pronounced inhibitory activity on the larval gut trypsin-like proteases of lepidopteran insect pest – Achaea janata. Consequently, a full-length cDNA of Bowman-Birk inhibitor gene (RsBBI1) was cloned from the immature seeds of R. sublobata. It contained an ORF of 360 bp encoding a 119-amino acid polypeptide (13.3 kDa) chain with an N-terminus signal sequence comprising of 22 amino acids. The amino acid sequence and phylogenetic analysis together revealed that RsBBI1 exhibited a close relation with BBIs from soybean and Phaseolus spp. A cDNA sequence corresponding to RsBBI1 mature protein (89 amino acid stretch) was expressed in E. coli. The recombinant rRsBBI1 protein with a molecular mass of 9.97 kDa was purified using trypsin affinity chromatography. The purified rRsBBI1 exhibited non-competitive mode of inhibition of both bovine trypsin (Ki of 358 ± 11 nM) and chymotrypsin (Ki of 446 ± 9 nM). Its inhibitory activity against these proteases was stable at high temperatures (>95 °C) and a wide pH range but sensitive to reduction with dithiothreitol (DTT), indicating the importance of disulphide bridges in exhibiting its activity. Also, rRsBBI1 showed significant inhibitory activity (IC50 = 70 ng) on A. janata larval gut trypsin-like proteases (AjGPs). Conversely, it showed
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Publisher |
Elsevier
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Date |
2018-07
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Language |
en
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Rights |
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Identifier |
http://oar.icrisat.org/10771/1/mohanraj2018.pdf
Mohanraj, S S and Tetali, S D and Mallikarjuna, N and Dutta-Gupta, A and Padmasree, K (2018) Biochemical properties of a bacterially-expressed Bowman-Birk inhibitor from Rhynchosia sublobata (Schumach.) Meikle seeds and its activity against gut proteases of Achaea janata. Phytochemistry (TSI), 151. pp. 78-90. ISSN 00319422 |
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