Temperature-Sensitive Mutants of Escherichia coli K-12 with Low Activities of the l-Alanine Adding Enzyme and the d-Alanyl-d-Alanine Adding Enzyme1
AUTOR(ES)
Lugtenberg, E. J. J.
RESUMO
A number of properties of temperature-sensitive mutants in murein synthesis are described. The mutants grow at 30 C but lyse at 42 C. One mutant possesses a temperature-sensitive d-alanyl-d-alanine adding enzyme, has an impaired rate of murein synthesis in vivo at both 30 and 42 C, and contains elevated levels of uridine diphosphate-N-acetyl-muramyl-tripeptide (UDP-MurNAc-l-Ala-d-Glu-m-diaminopimelic acid) at 42 C. The other mutant possesses an l-alanine adding enzyme with a very low in vitro activity at both 30 and 42 C. Its in vivo rate of murein synthesis is almost normal at 30 C but is much less at 42 C. When the murein precursors were isolated after incubation of the cells in the presence of 14C-l-alanine, they contained only a fraction of the radioactivity that could be obtained from a wild-type strain. A genetic nomenclature for genes concerned with murein synthesis is proposed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=247375Documentos Relacionados
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