Una mirada a los D-aminoácidos en los seres vivos
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La predominancia de los L-aminoácidos en los sistemas biológicos se ha considerado durante mucho tiempo como una característica definitoria de la vida. Sin embargo, la evidencia acumulada en las últimas décadas ha demostrado que los D-aminoácidos no son solo anomalías bioquímicas, sino moléculas biológicamente relevantes con funciones diversas y esenciales en todos los dominios de la vida. Esta revisión resume el conocimiento actual sobre la distribución, biosíntesis, metabolismo y funciones fisiológicas de los D-aminoácidos, destacando su importancia en contextos microbianos, animales y evolutivos. Los D-aminoácidos como la D-alanina y el D-glutamato en las bacterias son componentes integrales del peptidoglicano, contribuyendo a la integridad de la pared celular y a la resistencia a la degradación proteolítica. Más allá de sus funciones estructurales, varios D-aminoácidos actúan como moléculas de señalización para la formación de biofilms y la dinámica de las comunidades microbianas. En los eucariontes, particularmente en los mamíferos, han surgido la D-serina y el D-aspartato como neuromoduladores clave implicados en el neurodesarrollo y la regulación endocrina, con implicaciones crecientes en trastornos neurológicos y psiquiátricos. Además, la coexistencia de D-aminoácidos funcionales con un proteoma mayoritariamente basado en L-aminoácidos plantea preguntas fundamentales sobre el origen y el mantenimiento de la homoquiralidad biológica. Los mecanismos como las D-aminoacil-tRNA desaciclasas preservan activamente la homoquiralidad del proteoma, al tiempo que permiten la utilización selectiva de D-aminoácidos en rutas especializadas. En conjunto, los D-aminoácidos representan una dimensión crucial, aunque históricamente subestimada, de la química biológica, con implicaciones que van desde la fisiología microbiana hasta la neurociencia y el origen de la vida.
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