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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Bowman-Birk proteinase inhibitor from Clitoria fairchildiarta seeds: Isolation, biochemical properties and insecticidal potential

Texto completo
Autor(es):
Dantzger, Miriam [1, 2] ; Vasconcelos, Ilka Maria [3] ; Scorsato, Valeria [4, 5] ; Aparicio, Ricardo [4] ; Marangoni, Sergio [1] ; Rodrigues Macedo, Maria Ligia [1, 2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Inst Biol, Dept Biochem, BR-13083970 Campinas, SP - Brazil
[2] Univ Mato Grosso Sul, Ctr Biol & Hlth Sci, Dept Food Technol & Publ Hlth, BR-79070900 Campo Grande, MS - Brazil
[3] Univ Ceara, Dept Biochem & Mol Biol, BR-60451970 Fortaleza, CE - Brazil
[4] Univ Estadual Campinas, Inst Chem, Lab Struct Biol & Crystallog, BR-13083970 Campinas, SP - Brazil
[5] Univ Estadual Campinas, Inst Biol, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Phytochemistry; v. 118, p. 224-235, OCT 2015.
Citações Web of Science: 9
Resumo

Herein described is the biochemical characterisation, including in vitro and in vivo assays, for a proteinase inhibitor purified from Clitoria fairchildiana seeds (CFPI). Purification was performed by hydrophobic interaction and gel filtration chromatography. Kinetic studies of the purified inhibitor showed a competitive-type inhibitory activity against bovine trypsin and chymotrypsin, with an inhibition stoichiometry of 1:1 for both enzymes. The inhibition constants against trypsin and chymotrypsin were 3.3 x 10(-10) and 1.5 x 10(-10) M, respectively, displaying a tight binding property. SDS-PAGE showed that CFPI has a single polypeptide chain with an apparent molecular mass of 15 kDa under non-reducing conditions. However, MALDI-TOF analysis demonstrated a molecular mass of 7.973 kDa, suggesting that CFPI is dimeric in solution. The N-terminal sequence of CFPI showed homology with members of the Bowman-Birk inhibitor family. CFPI remained stable to progressive heating for 30 min to each temperature range of 37 up to 100 degrees C and CD analysis exhibited no changes in spectra at 207 nm after heating at 90 degrees C and subsequent cooling. Moreover, CFPI was active over a wide pH range (2-10). In contrast, reduction with DTT resulted in a loss of inhibitory activity against trypsin and chymotrypsin. CFPI also exhibited significant inhibitory activity against larval midgut trypsin enzymes from Anagasta kuehniella (76%), Diatraea saccharalis (59%) and Heliothis virescens (49%). Its insecticidal properties were further analysed by bioassays and confirmed by negative impact on A. kuehniella development. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 11/09361-0 - Inibidor de tripsina de Entada acaciifolia (EATI): caracterização estrutural e avaliação do potencial inseticida contra a lagarta-do-cartucho (Spodoptera frugiperda)
Beneficiário:Sergio Marangoni
Linha de fomento: Auxílio à Pesquisa - Regular