{"id":71238,"date":"2021-11-03T12:16:59","date_gmt":"2021-11-03T11:16:59","guid":{"rendered":"https:\/\/www.pcb.ub.edu\/cientificos-del-ibmb-csic-descifran-un-mecanismo-de-ataque-de-la-principal-bacteria-causante-de-periodontitis\/"},"modified":"2022-08-23T12:32:56","modified_gmt":"2022-08-23T10:32:56","slug":"cientificos-del-ibmb-csic-descifran-un-mecanismo-de-ataque-de-la-principal-bacteria-causante-de-periodontitis","status":"publish","type":"post","link":"https:\/\/www.pcb.ub.edu\/es\/cientificos-del-ibmb-csic-descifran-un-mecanismo-de-ataque-de-la-principal-bacteria-causante-de-periodontitis\/","title":{"rendered":"Cient\u00edficos del IBMB-CSIC descifran un mecanismo de ataque de la principal bacteria causante de periodontitis"},"content":{"rendered":"<p><strong>Un equipo liderado por cient\u00edficos del <a href=\"https:\/\/www.pcb.ub.edu\/es\/empresa\/institut-de-biologia-molecular-de-barcelona-ibmb-csic\/\" target=\"_blank\" rel=\"noopener\">Instituto de Biolog\u00eda Molecular de Barcelona (IBMB-CSIC)<\/a>, con sede en el Parque Cient\u00edfico de Barcelona, resuelven la estructura y funci\u00f3n de una enzima clave de la bacteria\u00a0<em>gingivalis<\/em>, la principal causante de periodontitis. Los resultados del estudio, publicado en la revista PNAS, podr\u00edan servir para el desarrollo de antis\u00e9pticos bucales espec\u00edficos contra esta bacteria. Se estima que entre el 5 y el 20% de los adultos y hasta el 40% de los ancianos en Europa tienen periodontitis, seg\u00fan cifras de la OMS.<\/strong><\/p>\n<p>Los investigadores del Instituto de Biolog\u00eda Molecular de Barcelona del Consell Superior de Investigaciones Cient\u00edficas (IBMB-CSIC) han descifrado un elemento clave del sistema de secreci\u00f3n de factores de virulencia de la principal bacteria causante de la periodontitis grave. <em>Se trata de Porphyromonas gingivalis,\u00a0<\/em>una especie pat\u00f3gena del microbioma bucal humano. Esta bacteria tiene un sistema de secreci\u00f3n (denominado T9SS) para enviar prote\u00ednas (conocidas en lenguaje cient\u00edfico como prote\u00ednas de \u201ccargo\u201d) al medio que la rodea, que en este caso es el tejido gingival que rodea los dientes.<\/p>\n<p>Estas prote\u00ednas producidas por\u00a0<em>P.gingivalis<\/em>\u00a0participan en la virulencia de las bacterias, en la inflamaci\u00f3n de las enc\u00edas y la destrucci\u00f3n de tejido y, en \u00faltima instancia, en la p\u00e9rdida de piezas dentales en caso de periodontitis grave. El sistema de secreci\u00f3n estudiado por los cient\u00edficos, el T9SS, tiene una enzima clave denominada PorU, que ejecuta dos pasos esenciales para que las prote\u00ednas \u2018cargos\u2019 puedan ser secretadas de forma provechosa para la bacteria.<\/p>\n<p>En una colaboraci\u00f3n con la Universidad Jaguel\u00f3nica de Cracovia (Polonia), la Universidad de Tesalia (Grecia) y la Universidad de Louisville (EEUU), los cient\u00edficos del Departamento de Biolog\u00eda Estructural del IBMB-CSIC han resuelto la estructura de la enzima PorU y han desvelado su mecanismo de actuaci\u00f3n.<\/p>\n<p>Tal como explica<strong>\u00a0F. Xavier Gomis-R\u00fcth<\/strong>, profesor de investigaci\u00f3n del IBMB-CSIC y uno de los l\u00edderes del trabajo, \u00abhemos podido determinar que una estrategia de dimerizaci\u00f3n de la enzima PorU prote\u00edna es la responsable de regular su actividad, reprimi\u00e9ndola hasta que llega a la membrana exterior de la bacteria, donde se asocia a un complejo de ensamblaje (\u2018<em>attachment complex<\/em>\u2019) que permite la secreci\u00f3n de las prote\u00ednas <em>cargos\u00bb<\/em>.<\/p>\n<p>Dado que la enzima PorU solo se encuentra en especies bacterianas, el conocimiento de su estructura y funci\u00f3n podr\u00eda servir para el desarrollo de antis\u00e9pticos bucales espec\u00edficos contra <em>P.gingivalis<\/em>\u00a0y, con ello, contra la periodontitis.<\/p>\n<p>El microbioma bucal humano est\u00e1 formado por m\u00e1s de 6 mil millones de bacterias de m\u00e1s de 770 especies, que son mayoritariamente comensales o mutualistas y contribuyen al mantenimiento de la homeostasis y la buena salud oral. Sin embargo, una dieta inadecuada y una higiene insuficiente pueden conducir a alteraciones en la composici\u00f3n del microbioma y al crecimiento desmesurado de especies patog\u00e9nicas y oportunistas, que sobrepasan en n\u00famero a las especies beneficiosas y toman el control del microbioma oral. Esto conduce, a su vez, a la aparici\u00f3n de caries y periodontitis, que en los casos m\u00e1s graves desemboca en inflamaci\u00f3n cr\u00f3nica y destrucci\u00f3n del tejido.<\/p>\n<p>Se estima que entre el 5 y el 20% de los adultos y hasta el 40% de los ancianos en Europa tienen periodontitis, seg\u00fan cifras de la Organizaci\u00f3n Mundial de la Salud (OMS). Y que alrededor de un 30% de la poblaci\u00f3n europea de entre 65 y 74 a\u00f1os ha perdido todos los dientes por la misma causa.<\/p>\n<p><strong>\u00bb<a href=\"https:\/\/delegacion.catalunya.csic.es\/descifrado-un-mecanismo-de-ataque-de-la-principal-bacteria-causante-de-periodontitis\/\" target=\"_blank\" rel=\"noopener\"> Enlace a la noticia [+]<\/a><\/strong><\/p>\n<p><strong>\u00bb Article de referencia: <\/strong>Danuta Mizgalska et al.\u00a0\u201cIntermolecular latency regulates the essential C-terminal signal peptidase and sortase of the\u00a0<em>P. gingivalis\u00a0<\/em>Type-IX Secretion System\u201d. PNAS October 5, 2021 118 (40) e2103573118; DOI:\u00a0<a href=\"https:\/\/doi.org\/10.1073\/pnas.2103573118\">https:\/\/doi.org\/10.1073\/pnas.2103573118<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un equipo liderado por cient\u00edficos del Instituto de Biolog\u00eda Molecular de Barcelona (IBMB-CSIC), con sede en el Parque Cient\u00edfico de Barcelona, resuelven la estructura y funci\u00f3n de una enzima clave&#8230;<\/p>\n","protected":false},"author":14,"featured_media":67701,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-71238","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ciencia"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cient\u00edficos del IBMB-CSIC descifran un mecanismo de ataque de la principal bacteria causante de periodontitis - 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