The nitrogen interaction network in Synechococcus WH5701, a cyanobacterium with two PipX and two PII-like proteins
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Título: | The nitrogen interaction network in Synechococcus WH5701, a cyanobacterium with two PipX and two PII-like proteins |
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Autor/es: | Laichoubi, Karim Boumediene | Beez, Sabine | Espinosa, Javier | Forchhammer, Karl | Contreras, Asunción |
Grupo/s de investigación o GITE: | Transducción de Señales en Bacterias |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Fisiología, Genética y Microbiología | University Tuebingen. Lehrstuhl fur Mikrobiologie, Organismische Interaktionen |
Palabras clave: | Synechococcus | PipX |
Área/s de conocimiento: | Genética |
Fecha de creación: | dic-2010 |
Fecha de publicación: | abr-2011 |
Editor: | Society for General Microbiology |
Cita bibliográfica: | LAICHOUBI, Karim Boumediene, et al. “The nitrogen interaction network in Synechococcus WH5701, a cyanobacterium with two PipX and two PII-like proteins”. Microbiology. 157 (2011). ISSN 1350-0872, pp. 1220-1228 |
Resumen: | Nitrogen regulation involves the formation of different types of protein complexes between signal transducers and their transcriptional or metabolic targets. In oxygenic phototrophs, the signal integrator PII activates the enzyme N-acetyl-l-glutamate kinase (NAGK) by complex formation. PII also interacts with PipX, a protein with a tudor-like domain that mediates contacts with PII and with the transcriptional regulator NtcA, to which it binds to increase its activity. Here, we use a combination of in silico, yeast two-hybrid and in vitro approaches to investigate the nitrogen regulation network of Synechococcus WH5701, a marine cyanobacterium with two PII (GlnB_A and GlnB_B) and two PipX (PipX_I and PipX_II) proteins. Our results indicate that GlnB_A is functionally equivalent to the canonical PII protein from Synechococcus elongatus. GlnB_A interacted with PipX and NAGK proteins and stimulated NAGK activity, counteracting arginine inhibition. GlnB_B had only a slight stimulatory effect on NAGK activity, but its potential to bind effectors and form heterotrimers in Synechococcus WH5701 indicates additional regulatory functions. PipX_II, and less evidently PipX_I, specifically interacted with GlnB_A and NtcA, supporting a role for both Synechococcus WH5701 PipX proteins in partner swapping with GlnB_A and NtcA. |
Patrocinador/es: | This work was supported by grants from Ministerio de Ciencia e Innovación (BFU2009-07371) and Ministerio de Educación y Ciencia (HA2007-0074). |
URI: | http://hdl.handle.net/10045/17724 |
ISSN: | 1350-0872 (Print) | 1465-2080 (Online) |
DOI: | 10.1099/mic.0.047266-0 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1099/mic.0.047266-0 |
Aparece en las colecciones: | INV - TSB - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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laichoubi et al.pdf | Versión final (acceso restringido) | 453,36 kB | Adobe PDF | Abrir Solicitar una copia |
WH5701.pdf | Versión revisada (acceso abierto) | 1,78 MB | Adobe PDF | Abrir Vista previa |
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