Data/hora: 12/06/2024 13:17:52

Provedor de dados: | 58
País: | Brazil
Título: | Hyperexpression of two Aspergillus niger xylanase genes in Escherichia coli and characterization of the gene products
Autores: | Yi,Xiuli; Shi,Yan; Xu,Hui; Li,Wei; Xie,Jie; Yu,Rongqing; Zhu,Jun; Cao,Yi; Qiao,Dairong.
Data: | 2010-10-01
Ano: | 2010
Palavras-chave: | Aspergillus niger; Xylanase; Prokaryotic expression; Enzymatic characterization.
Resumo: | The analysis of individual gene product should enable to clarify the role of a particular enzyme in a complex xylanase system of A. niger. The two genes encoding precursors of co-produced endo-1,4-β-D-xylanases, xynA1 and xynB, were isolated from Aspergillus niger SCTCC 400264 (SCTCC, China) by using RT-PCR technique and then successfully expressed in Escherichia coli BL21. The nucleotide sequences of the xynA1 and xynB genes revealed that they were only 52.5% homology to each other. Characterization of the recombinant enzymes revealed the different properties: the specific activity of recombinant XYNA1 was 16.58 U/mg compared to 1201.7 U/mg for recombinant XYNB; The optimum temperature and pH of the recombinant XYNA1 were 35 ºC and 3.0, respectively, whereas the corresponding values for the recombinant XYNB were 55 ºC and 5.0, respectively; The recombinant XYNB showed much more thermostability than recombinant XYNA1; The recombinant XYNB showed 94% of maximal activity after incubating in water for 60 min at 60 ºC compared to no activity for recombinant XYNA1. Various metal ions had different effects on activity between the two recombinant xylanases.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000300030
Editor: | Sociedade Brasileira de Microbiologia
Relação: | 10.1590/S1517-83822010000300030
Formato: | text/html
Fonte: | Brazilian Journal of Microbiology  v.41 n.3 2010
Fonte: | info:eu-repo/semantics/openAccess