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	Provedor de dados BABT (1) Autor Gunasekaran,P. (1) Kannan,T.R. (1) Raj,K. Chandra (1) Sangiliyandi,G. (1) Palavra-chave In vitro mutagenesis (1) Levan (1) Levansucrase (1) Polymerase (1) Selective modulation (1) Sucrase (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Ano 1999 (1) País Brazil (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 1 Primeira ... 1 ... Última Separation of levan-formation and sucrose-hydrolysis catalyzed by levansucrase of Zymomonas mobilis using in vitro mutagenesis BABT Sangiliyandi,G.; Kannan,T.R.; Raj,K. Chandra; Gunasekaran,P.. A levansucrase (SacB) of Zymomonas mobilis capable of sucrose hydrolysis but not levan formation was isolated through invitro mutagenesis of cloned sacB gene. When the sacB mutant gene was expressed in Escherichiacoli strains, only 50% of the sucrose-hydrolysing activity (2.0 U/mg) was produced, compared to the wild type levansucrase (4.0 U/mg). Sequencing of the sacB mutant gene revealed changes of two amino acid residues (Phe-102 to Leu and Trp-261 to Lys in the levansucrase). The absence of mutation at the site of Cys of SacB is contradictory to the inhibition kinetics that demonstrated the involvement of Cys in conferring the levan-forming activity to the SacB. The present finding is useful in understanding the mechanism of selective modulation of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Levansucrase; Polymerase; Sucrase; In vitro mutagenesis; Levan; Selective modulation. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400001 Registros recuperados: 1 Primeira ... 1 ... Última

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