Integrative meta-analysis of protein interaction data identified multiple GID/MRCTLH protein complexes in plants

Abstract

GID/MRCTLH is a protein complex involved in the regulation of several cellular processes through the polyubiquitination and proteosome degradation. It has been described in yeast and mammals. Genes coding for homologous proteins are also present in plant genomes but have been little studied. BLAST analyses revealed that genes coding for members of the GID/MRCTLH complex are found in multiple copies in plants, compared to mammals and yeast. The potential structure of the Arabidopsis GID/MRCTLH complex was estimated based on the Arabidopsis protein interaction database Interactome 2.0. According to these data, Arabidopsis may contain two GID/MRCTLH complexes instead of the one described in yeast and mammals. The structure of the two Arabidopsis complexes seem to be similar to the yeast GID complex, and seem to interact with several other proteins out of the complex. These data suggest that, similarly to yeast and mammals, the plant GID/MRCTLH complexes are involved in the regulation of several cellular processes through proteosome protein degradation.

Microtubule interaction of LICC1, a maize homologue of a component of the human muskelin/RanBPM/CTLH protein complex

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Yeast GID is a 600 kDa protein complex composed of seven proteins that functions as a ubiquitin-ligase complex and participates in the inactivation of gluconeogenesis (Menssen et al 2012). There are GID-like protein complexes in most Eukaryotes, but not in Prokaryotes (Francis et al 2013).

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