Purification, characterization and structural determination of chitinases produced by Moniliophthora perniciosa

Anais da Academia Brasileira de Ciências

Rafaela S. Galante²  Alex G. Taranto¹  Maria G.b. Koblitz¹  Aristóteles Góes-neto¹  Carlos P. Pirovani¹  Júlio C.m. Cascardo¹  Sandra H. Cruz¹  Gonçalo A.g. Pereira¹  Sandra A. De Assis² 

[1] ,Universidade Estadual de Feira de Santana Departamento de Saúde Feira de Santana BA ,Brasil

关键词: Chitinase;    Moniliophthora perniciosa;    kinetic characterization;    purification;    isoenzymes;    heat stability;    3D structure;    comparative modeling;    quitinase;    Moniliophthora perniciosa;    caracterização cinética;    purificação;    isoenzimas;    estabilidade térmica;    estrutura 3D;    modelagem comparativa;   

DOI  :  10.1590/S0001-37652012000200016

来源: SciELO

【 摘 要 】

The enzyme chitinase from Moniliophthora perniciosa the causative agent of the witches' broom disease in Theobroma cacao, was partially purified with ammonium sulfate and filtration by Sephacryl S-200 using sodium phosphate as an extraction buffer. Response surface methodology (RSM) was used to determine the optimum pH and temperature conditions. Four different isoenzymes were obtained: ChitMp I, ChitMp II, ChitMp III and ChitMp IV. ChitMp I had an optimum temperature at 44-73ºC and an optimum pH at 7.0-8.4. ChitMp II had an optimum temperature at 45-73ºC and an optimum pH at 7.0-8.4. ChitMp III had an optimum temperature at 54-67ºC and an optimum pH at 7.3-8.8. ChitMp IV had an optimum temperature at 60ºC and an optimum pH at 7.0. For the computational biology, the primary sequence was determined in silico from the database of the Genome/Proteome Project of M. perniciosa, yielding a sequence with 564 bp and 188 amino acids that was used for the three-dimensional design in a comparative modeling methodology. The generated models were submitted to validation using Procheck 3.0 and ANOLEA. The model proposed for the chitinase was subjected to a dynamic analysis over a 1 ns interval, resulting in a model with 91.7% of the residues occupying favorable places on the Ramachandran plot and an RMS of 2.68.

【 授权许可】

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