Cell wall growth of Bacillus megaterium: cytoplasmic radioactivity after pulse-labeling with tritiated diaminopimelic acid.
AUTOR(ES)
de Chastellier, C
RESUMO
Study of the cell wall growth in Bacillus megaterium by pulse-labeling a DAP- Lys- mutant with tritiated diaminopimelic acid (DAP) had revealed the presence of intracytoplasmic radioactivity. The nature of this radioactivity was studied on one hand by autoradiographic analysis of bacteria treated in different ways and on the other hand by chromatography of the radioactive compounds extracted with boiling water. It is shown that cytoplasmic radioactivity corresponds neither to free DAP nor to DAP metabolized into lysine, but to murein precursors. Autoradiographic analysis of bacteria in which all murein precursors were removed gives exactly the same cell wall growth pattern as the one previously obtained for untreated bacteria. It can be concluded that, in B. megaterium, cell wall elongation occurs by diffuse intercalation of newly synthesized murein along the cylindrical part of the cell wall and that only cross wall formation occurs in a precise growth zone.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=235845Documentos Relacionados
- Aflatoxin Biosynthesis: Detection of Transient, Acetate-Dependent Intermediates in Aspergillus by Kinetic Pulse-Labeling
- Precursor recognition by kinetic pulse-labeling in a toxigenic aflatoxin B1-producing strain of Aspergillus.
- Pulse-labeling Studies on Protein Synthesis in Developing Pea Seeds and Evidence of a Precursor Form of Legumin Small Subunit
- Cell wall assembly in Bacillus megaterium: incorporation of new peptidoglycan by a monomer addition process.
- Mode of Cell Wall Growth of Bacillus megaterium
