{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T00:33:25Z","timestamp":1774398805835,"version":"3.50.1"},"reference-count":116,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2023,3,15]],"date-time":"2023-03-15T00:00:00Z","timestamp":1678838400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Mol. Neurosci."],"abstract":"<jats:p>Spinocerebellar ataxia type 3, also known as Machado-Joseph disease (SCA3\/ MJD), is the most frequent polyglutamine (polyQ) neurodegenerative disorder. It is caused by a pathogenic expansion of the polyQ tract, located at the C-terminal region of the protein encoded by the <jats:italic>ATXN3<\/jats:italic> gene. This gene codes for a deubiquitinating enzyme (DUB) that belongs to a gene family, that in humans is composed by three more genes (<jats:italic>ATXN3L<\/jats:italic>, <jats:italic>JOSD1<\/jats:italic>, and <jats:italic>JOSD2<\/jats:italic>), that define two gene lineages (the <jats:italic>ATXN3<\/jats:italic> and the Josephins). These proteins have in common the N-terminal catalytic domain (Josephin domain, JD), that in Josephins is the only domain present. In <jats:italic>ATXN3<\/jats:italic> knock-out mouse and nematode models, the SCA3 neurodegeneration phenotype is not, however, reproduced, suggesting that in the genome of these species there are other genes that are able to compensate for the lack of <jats:italic>ATXN3<\/jats:italic>. Moreover, in mutant <jats:italic>Drosophila melanogaster<\/jats:italic>, where the only JD protein is coded by a Josephin-like gene, expression of the expanded human <jats:italic>ATXN3<\/jats:italic> gene reproduces multiple aspects of the SCA3 phenotype, in contrast with the results of the expression of the wild type human form. In order to explain these findings, phylogenetic, as well as, protein\u2013protein docking inferences are here performed. Here we show multiple losses of JD containing genes across the animal kingdom, suggesting partial functional redundancy of these genes. Accordingly, we predict that the JD is essential for binding with ataxin-3 and proteins of the Josephin lineages, and that <jats:italic>D. melanogaster<\/jats:italic> mutants are a good model of SCA3 despite the absence of a gene from the <jats:italic>ATXN3<\/jats:italic> lineage. The molecular recognition regions of the ataxin-3 binding and those predicted for the Josephins are, however, different. We also report different binding regions between the two ataxin-3 forms (wild-type (wt) and expanded (exp)). The interactors that show an increase in the interaction strength with exp ataxin-3, are enriched in extrinsic components of mitochondrial outer membrane and endoplasmatic reticulum membrane. On the other hand, the group of interactors that show a decrease in the interaction strength with exp ataxin-3 is significantly enriched in extrinsic component of cytoplasm.<\/jats:p>","DOI":"10.3389\/fnmol.2023.1140719","type":"journal-article","created":{"date-parts":[[2023,3,15]],"date-time":"2023-03-15T05:55:31Z","timestamp":1678859731000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":8,"title":["The Josephin domain (JD) containing proteins are predicted to bind to the same interactors: Implications for spinocerebellar ataxia type 3 (SCA3) studies using Drosophila melanogaster mutants"],"prefix":"10.3389","volume":"16","author":[{"given":"Rita","family":"Sousa e Silva","sequence":"first","affiliation":[]},{"given":"Andr\u00e9 Dias","family":"Sousa","sequence":"additional","affiliation":[]},{"given":"Jorge","family":"Vieira","sequence":"additional","affiliation":[]},{"given":"Cristina P.","family":"Vieira","sequence":"additional","affiliation":[]}],"member":"1965","published-online":{"date-parts":[[2023,3,15]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"W7","DOI":"10.1093\/nar\/gkq291","article-title":"TranslatorX: multiple alignment of nucleotide sequences guided by amino acid translations","volume":"38","author":"Abascal","year":"2010","journal-title":"Nucleic Acids Res."},{"key":"ref2","doi-asserted-by":"publisher","first-page":"2380","DOI":"10.1093\/hmg\/ddq111","article-title":"Silencing ataxin-3 mitigates degeneration in a rat model of Machado-Joseph disease: no role for wild-type ataxin-3?","volume":"19","author":"Alves","year":"2010","journal-title":"Hum. 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