Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P00790 (PGA)
 2,475 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In Bacillus subtilis, the ComQXPA quorum-sensing system controls cell density-dependent phenotypes such as the production of degradative enzymes and antibiotics and the development of genetic competence. Bacillus subtilis (natto) NAF12, a mutant defective in poly-gamma-glutamate (gamma-PGA) production, was derived from B. subtilis (natto) NAF4 by Tn917-LTV1 insertional mutagenesis. Determination of the mutant DNA sequences flanking the Tn917-LTV1 insert revealed that the insertion had inactivated comP in this mutant, indicating that gamma-PGA synthesis in B. subtilis (natto) is under the control of the ComP-ComA signal transduction system. A comparison of the amino acid sequences revealed striking variation in the primary structures of ComQ (44% identity), ComX (26%) and the sensor domain of ComP (36%) between B. subtilis (natto) NAF4 and B. subtilis 168. In contrast, the amino acid and nucleotide sequences of the kinase domains of ComP and of the ComA response regulator share 95% and 100% identity respectively. The comP genes of NAF4 and 168 restored the impaired competence of B. subtilis BD1658 (comP:cat) and gamma-PGA production of B. subtilis (natto) NAF12 (comP:Tn917-LTV1) to only 15% of the level achieved by the respective parent comP genes. However, when introduced together with the cognate comQ and comX genes, the comP genes restored the relevant defect of the heterologous comP mutants nearly to wild-type levels. Analogous to the comCDE system of Streptococcus strains and the agrBCDE system of Staphylococcus aureus, the concerted variation in the comQXP genes appears to establish specific intercellular communication between B. subtilis strains sharing the same pheromone system.
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PMID:Divergent structure of the ComQXPA quorum-sensing components: molecular basis of strain-specific communication mechanism in Bacillus subtilis. 1097 33

A generalized transducing phage, (phi)BN100, was isolated from a Bacillus subtilis (natto) strain producing poly-(gamma)-glutamic acid ((gamma)PGA). Transduction frequencies for a given marker ranged from 3.8 x 10(sup-8) to 1.6 x 10(sup-6) per phage particle. The genome size of the phage was approximately 42 kb. (phi)BN100 was used successfully to identify bona fide Tn917-LTV1 transpositional mutants defective in (gamma)PGA production.
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PMID:Characterization of a Generalized Transducing Phage of Poly-(gamma)-Glutamic Acid-Producing Bacillus subtilis and Its Application for Analysis of Tn917-LTV1 Insertional Mutants Defective in Poly-(gamma)-Glutamic Acid Production. 1653 18