{"id":76910,"date":"2018-03-09T23:22:20","date_gmt":"2018-03-09T23:22:20","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/analisis-genetico-y-molecular-de-un-transductor-de-la-senal-luminosa-en-la-bacteria-myxococcus-xanthus\/"},"modified":"2018-03-09T23:22:20","modified_gmt":"2018-03-09T23:22:20","slug":"analisis-genetico-y-molecular-de-un-transductor-de-la-senal-luminosa-en-la-bacteria-myxococcus-xanthus","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/analisis-genetico-y-molecular-de-un-transductor-de-la-senal-luminosa-en-la-bacteria-myxococcus-xanthus\/","title":{"rendered":"An\u00e1lisis gen\u00e9tico y molecular de un transductor de la se\u00f1al luminosa en la bacteria myxococcus xanthus"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Liliana Galbis Mart\u00ednez <\/strong><\/h2>\n<p>Myxococcus xanthus  es una bacteria gram-negativa que responde a la luz azul produciendo carotenoides, pigmentos que protegen a las c\u00e9lulas de los efectos da\u00f1inos de la radiaci\u00f3n luminosa.  en este proceso se encuentran implicados una serie de genes que determinan tanto enzimas carotenog\u00e9nicas como prote\u00ednas reguladoras. A este \u00faltimo grupo pertenece el producto del gen carf, identificado por primera vez en este trabajo, cuyos mutantes nulos son incapaces de producir carotenoides. carf act\u00faa, por tanto, como un regulador positivo de la carotenog\u00e9nesis inducida por luz azul. Mutaciones en el gen carf no afectan, sin embargo, a otros procesos celulares distintos de la carotenog\u00e9nesis.  el an\u00e1lisis gen\u00e9tico por epistasia indica que la prote\u00edna carf ejerce su funci\u00f3n reguladora en los primeros pasos del mecanismo de respuesta a la luz azul, actuando bien como receptor de la se\u00f1al luminosa o bien como transductor de la misma. De alguna forma, carf provoca la inactivaci\u00f3n, mediada por la luz, de la prote\u00edna carr, un factor anti-sigma. En la oscuridad, carr inactiva a la prote\u00edna carq, un factor sigma perteneciente a la familia ecf (extra-cytoplasmic function) que es necesario para la expresi\u00f3n de los genes estructurales de la carotenog\u00e9nesis. Cabe destacar que en ensayos de doble h\u00edbrido en escherichia coli, se observa interacci\u00f3n f\u00edsica entre carr y carf, as\u00ed como entre carr y carq. En este trabajo tambi\u00e9n se estudi\u00f3 la interacci\u00f3n entre mol\u00e9culas de carr o carf. Los resultados obtenidos indican que ambas prote\u00ednas pueden unirse a s\u00ed mismas, abriendo la posibilidad de que carr y carf formen parte de alg\u00fan tipo de macrocomplejo en el que participen formas homomultim\u00e9ricas de una y otra prote\u00edna. Asimismo, se ha comprobado que carq interfiere, de alguna manera en la interacci\u00f3n observada entre las prote\u00ednas carr y carf.  mediante fusiones transcripcionales del gen lacz a distintos fragmentos de carf, se delimi<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>An\u00e1lisis gen\u00e9tico y molecular de un transductor de la se\u00f1al luminosa en la bacteria myxococcus xanthus<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 An\u00e1lisis gen\u00e9tico y molecular de un transductor de la se\u00f1al luminosa en la bacteria myxococcus xanthus <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Liliana Galbis Mart\u00ednez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Murcia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 28\/10\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Francisco Murillo  Araujo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: cecilio Jes\u00fas Vidal moreno <\/li>\n<li>Antonio Martinez laborda (vocal)<\/li>\n<li>Antonio Sanchez amat (vocal)<\/li>\n<li>lorenzo Burgos ortiz (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Liliana Galbis Mart\u00ednez Myxococcus xanthus es una bacteria gram-negativa que responde a la luz azul produciendo carotenoides, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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