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2002 - Instituto de Química - USP

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Pedro Soares <strong>de</strong> AraujoTRANSPORTE DE TREALOSE EESTRESSE CELULAR EMSACCHAROMYCES CEREVISIAE.Os objetivos <strong>de</strong>ste projeto <strong>de</strong> pesquisa são: 1-Determinar os aminoácidos da permease AGT1envolvidos na ligação do H + durante o transporte <strong>de</strong>a-glicosí<strong>de</strong>os por mutagênese sítio-dirigida e analisara ativida<strong>de</strong> <strong>de</strong> cotransporte <strong>de</strong> prótons nas permeasesmutantes. 2-Determinar os aminoácidos e/oudomínios da(s) proteína(s) transportadora(s)envolvidos na especificida<strong>de</strong> do transporte. 3-Determinar os aminoácidos e/ou domínios da permeaseAGT1 envolvidos na regulação do transporte,analisando a inativação catabólica <strong>de</strong> permeasesmutantes em diversos sinais como fosforilação eubiquitinação, envolvidos na endocitose e <strong>de</strong>gradaçãovacuolar <strong>de</strong> proteínas <strong>de</strong> membrana.Estes objetivos visam a compreensão da regulaçãodos fluxos metabólicos envolvidos na resistência dascélulas <strong>de</strong> S. cerevisiae a diversos estresses, comênfase na <strong>de</strong>sidratação.SummaryThe main objectives of this project are: 1- To <strong>de</strong>terminethe aminoacid residues of the AGT1 permeaseinvolved in H + binding during a-glucosi<strong>de</strong>transport using site –directed mutagenesis and toanalyze the cotransport in the mutated permeases.2- To <strong>de</strong>termine the aminoacid and/or transport proteindomains involved in transport specificity. 3- To<strong>de</strong>termine the aminoacids and/or AGT1 permeasedomains involved in transport regulation by analyzingthe catabolic inactivation of mutant permeasesin relation to signals like phosphorilation andubiquitinilation involved in membrane proteins endocytosisand vacuolar <strong>de</strong>gradation. The aim of theseobjectives is to foster our un<strong>de</strong>rstanding of the regulationof the metabolic fluxes involved in S. cerevisiaeresistance to several stresses, with emphasis in <strong>de</strong>hydration.Referencias:Stambuk, B.U., da Silva, M.A., Panek, A.D. & <strong>de</strong> Araujo, P.S. - Active “-glucosi<strong>de</strong> transport in Saccharomyces cerevisiae. - FEMS Microbiol. Lett.170: 105-110, 1999Stambuk, B.U., Batista, A.S., <strong>de</strong> Araujo, P.S. - Kinetics of active sucrosetransport in Saccharomyces cerevisiae. - J. Biosci. Bioeng. 89: 213-216,2000Stambuk, B.U. & <strong>de</strong> Araujo, P.S. – Kinetics of active a-glucosi<strong>de</strong> transportin Saccahromyces cerevisiae. FEMS Yeast Res. 1:73-78, 2001Zastrow, C. R., Hollatz, C., <strong>de</strong> Araujo, P. S.& Stambuk, B. U. Maltotriosefermentation by Saccharomyces cerevisiae J. Ind. Microbiol. Biotechnol.27: 34-38, 2001Costa, M.H.B., Quintilio, W., Sant’Anna, O.A., Faljoni-Alário, A. & <strong>de</strong>Araujo, P.S. The use of protein structure/activity relationships for therational <strong>de</strong>sign of stable particulate <strong>de</strong>livery systems. Braz. J. Med. Biol.Res. 35: 727-730, <strong>2002</strong>Departamento <strong>de</strong> Química Bioquímica Fundamental85<strong>Instituto</strong> <strong>de</strong> Química - Pesquisa 2001 - <strong>2002</strong>

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