Xylanase and β-xylosidase from Penicillium janczewskii: Purification, characterization and hydrolysis of substrates

Autor(es)

César Rafael Fanchini Terrasan ^[1] ; José Manuel Guisan ^[2] ; Eleonora Cano Carmona ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista - UNESP. Biosciences Institute. Biochemistry and Microbiology Department - Brasil

^[2] Universidad Autónoma de Madrid. Instituto de Catálisis, CSIC. Departamento de Biocatálisis - Espanha

^[3] Univ Estadual Paulista - UNESP. Biosciences Institute. Biochemistry and Microbiology Department - Brasil

• Tipo de documento: Artigo Científico
• Fonte: ELECTRONIC JOURNAL OF BIOTECHNOLOGY; v. 19, n. 5, p. 54-62, 2016-09-00.

Resumo

Background: Xylanases and β-D-xylosidases are the most important enzymes responsible for the degradation of xylan, the second main constituent of plant cell walls. Results: In this study, the main extracellular xylanase (XYL I) and p-xylosidase (BXYL I) from the fungus Penicillium janczewskii were purified, characterized and applied for the hydrolysis of different substrates. Their molecular weights under denaturing and non-denaturing conditions were, respectively, 30.4 and 23.6 kDa for XYL I, and 100 and 200 kDa for BXYL I, indicating that the latter is homodimeric. XYL I is highly glycosylated (78%) with optimal activity in pH 6.0 at 65°C, while BXYL I presented lower sugar content (10.5%) and optimal activity in pH 5.0 at 75°C. The half-lives of XYL I at 55, 60 and 65°C were 125,16 and 6 min, respectively. At 60°C, BXYL I retained almost 100% of the activity after 6 h. NH4+,Na+, DTT and β-mercaptoethanol stimulated XYL I, while activation of BXYL I was not observed. Interestingly, XYL I was only partially inhibited by Hg2+, while BXYL I was completely inhibited. Xylobiose, xylotriose and larger xylooligosaccharides were the main products from xylan hydrolysis by XYL I. BXYL I hydrolyzed xylobiose and larger xylooligosaccharides with no activity against xylans. Conclusion: The enzymes act synergistically in the degradation of xylans, and present industrial characteristics especially in relation to optimal activity at high temperatures, prolonged stability of BXYL I at 60°C, and stability of XYL I in wide pH range. (AU)

• Processo FAPESP: 07/08640-8 - Xilanases, b-xilosidases de Penicillium janczewskii: purificação, caracterização e aplicação no branqueamento da polpa celulósica e para ração animal
• Beneficiário: César Rafael Fanchini Terrasan
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/16582-0 - Purificação, propriedades e aplicação de enzimas xilanolíticas produzidas por Penicillium janczewskii
• Beneficiário: Eleonora Cano Carmona
• Modalidade de apoio: Auxílio à Pesquisa - Regular