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© Sandrine Etienne-Manneville
Photo prise à l'avant (dans la protrusion) d'astrocytes primaires de rat en migration. Marquage par immunofluorescence montrant en rouge, p150 Glued, une protéine associée aux extrémités 'plus' des microtubules et en vert la tubuline des microtubules. La photographie montre l'accumulation de p150 Glued à l'avant des cellules en migration, où la protéine pourrait participer à l'ancrage des microtubules à la membrane plasmique. Pour essayer de corriger, les dérèglements observés lors de la migration des cellules d'astrocytes tumuraux ou gliomes on cherche à connaitre les mécanismes moléculaires fondamentaux qui controlent la polarisation et la migration cellulaires.
Publication : Microbiology (Reading, England)

The role of the Corynebacterium glutamicum rel gene in (p)ppGpp metabolism

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Microbiology (Reading, England) - 01 Jul 1998

Wehmeier L, Schäfer A, Burkovski A, Krämer R, Mechold U, Malke H, Pühler A, Kalinowski J

Link to Pubmed [PMID] – 9695918

Microbiology (Reading, Engl.) 1998 Jul;144 ( Pt 7):1853-62

To investigate the metabolism of (p)ppGpp in amino-acid-producing coryneform bacteria, a PCR-based strategy using degenerate consensus oligonucleotides was applied to isolate the rel gene of Corynebacterium glutamicum ATCC 13032. The gene consists of 2283 nucleotides and encodes a protein of 760 amino acids with a molecular mass of 84.4 kDa. The amino acid sequence revealed extensive similarities to the related proteins RelA and SpoT of Escherichia coli, which are known to be involved in (p)ppGpp biosynthesis and degradation. The C. glutamicum rel gene is located downstream of the apt gene encoding an adenine phosphoribosyltransferase, and an ORF with similarities to dciAE, which represents part of a dipeptide transport system in E. coli. A C. glutamicum mutant strain carrying a defined deletion in the rel gene was constructed. This mutant failed to accumulate (p)ppGpp in response to amino acid starvation. When overexpressed in E. coli, the C. glutamicum rel gene was able to reverse growth defects caused by an overexpressed relA gene. It is proposed that the C. glutamicum rel gene encodes a bifunctional enzyme with (p)ppGpp synthetase and (p)ppGpp-degrading activities.

http://www.ncbi.nlm.nih.gov/pubmed/9695918