Characterization of a novel inhibitory feedback of the anti-anti-sigma SpoIIAA on Spo0A activation during development in Bacillus subtilis.

Arabolaza, Ana L; Nakamura, Akira; Pedrido, María E; Martelotto, Luciano; Orsaria, Lelia; Grau, Roberto R

Arabolaza, Ana L; Nakamura, Akira; Pedrido, María E; Martelotto, Luciano; Orsaria, Lelia; Grau, Roberto R.

Afiliación

Arabolaza AL; Department of Microbiology, Rosario University School of Biochemistry and Pharmacy, and Institute for Molecular and Cellular Biology of Rosario, IBR-CONICET. Suipacha 531, Sala 9, Rosario-2000, Argentina.

Mol Microbiol ; 47(5): 1251-63, 2003 Mar.

Article en En | MEDLINE | ID: mdl-12603732

RESUMEN

Compartmentalized gene expression during sporulation is initiated after asymmetric division by cell-specific activation of the transcription factors sigmaF and sigmaE. Synthesis of these sigma factors, and their regulatory proteins, requires the activation (phosphorylation) of Spo0A by the phosphorelay signalling system. We report here a novel regulatory function of the anti-anti-sigmaF SpoIIAA as inhibitor of Spo0A activation. This effect did not require sigmaF activity, and it was abolished by expression of the phosphorelay-independent form Spo0A-Sad67 indicating that SpoIIAA directly interfered with Spo0A approximately P generation. IPTG-directed synthesis of the SpoIIE phosphatase in a strain carrying a multicopy plasmid coding for SpoIIAA and its specific inhibitory kinase SpoIIAB blocked Spo0A activation suggesting that the active form of the inhibitor was SpoIIAA and not SpoIIAA-P. Furthermore, expression of the non-phosphorylatable mutant SpoIIAAS58A (SpoIIAA-like), but not SpoIIAAS58D (SpoIIAA-P-like), completely blocked Spo0A-dependent gene expression. Importantly, SpoIIAA expressed from the chromosome under the control of its normal spoIIA promoter showed the same negative effect regulated not only by SpoIIAB and SpoIIE but also by septum morphogenesis. These findings are discussed in relation to the potential contribution of this novel inhibitory feedback with the proper activation of sigmaF and sigmaE during development.

Asunto(s)

Bacillus subtilis/fisiología; Proteínas Bacterianas/metabolismo; Proteínas Bacterianas/fisiología; Factores de Transcripción/metabolismo; Sustitución de Aminoácidos; Bacillus subtilis/genética; Bacillus subtilis/metabolismo; Proteínas Bacterianas/biosíntesis; Proteínas Bacterianas/genética; Compartimento Celular; Retroalimentación Fisiológica; Regulación Bacteriana de la Expresión Génica/efectos de los fármacos; Genes Reporteros; Isopropil Tiogalactósido/farmacología; Operón Lac; Modelos Genéticos; Mutación Missense; Fosforilación; Regiones Promotoras Genéticas/efectos de los fármacos; Regiones Promotoras Genéticas/genética; Procesamiento Proteico-Postraduccional; Proteínas Recombinantes de Fusión/fisiología; Factor sigma/metabolismo; Esporas Bacterianas; Transcripción Genética

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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bacillus subtilis / Proteínas Bacterianas / Factores de Transcripción Tipo de estudio: Prognostic_studies Idioma: En Revista: Mol Microbiol Asunto de la revista: BIOLOGIA MOLECULAR / MICROBIOLOGIA Año: 2003 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Reino Unido

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