Temperature-sensitive glucosamine auxotroph of Saccharomyces cerevisiae.
AUTOR(ES)
Ballou, L
RESUMO
Temperature-sensitive revertants were isolated from Saccharomyces cerevisiae D-glucosamine auxotrophs previously obtained in this laboratory (W. L. Whelan and C. E. Ballou, J. Bacteriol. 124:1545-1557, 1975). The auxotrophs lack the enzyme 2-amino-2-deoxy-D-glucose-6-phosphate ketol-isomerase (EC 5.3.1.19), and the revertants appear to be temperature sensitive in the formation of enzyme activity. The enzyme they produce under permissive conditions decays in activity at a rate comparable to that of the wild-type enzyme, and it has similar kinetic properties. The homozygous diploid mutant fails to sporulate at the nonpermissive temperature. Temperature shift experiments were carried out in an effort to determine what effect glucosamine deficiency had on mannoprotein secretion as reflected in the formation of external asparaginase. Although the results were complicated by the slow decay of the residual ketol-isomerase activity, they did show that mannoprotein synthesis or secretion was altered when the internal pool of D-glucosamine was depleted.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=369321Documentos Relacionados
- Isolation and characterization of temperature-sensitive mak mutants of Saccharomyces cerevisiae.
- Isolation and characterization of temperature-sensitive RNA polymerase II mutants of Saccharomyces cerevisiae.
- Null alleles of SAC7 suppress temperature-sensitive actin mutations in Saccharomyces cerevisiae.
- Ty Element-Induced Temperature-Sensitive Mutations of Saccharomyces Cerevisiae
- Cycloheximide-Resistant Temperature-Sensitive Lethal Mutations of Saccharomyces Cerevisiae
