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Experimental validation of AR V770 variants demonstrated that AR V770D was transcriptionally inactive due to the inability to dimerize and a reduced ligand binding affinity. The more conservative AR V770A variant showed a dimerization defect at low levels of DHT with a partial recovery of the transcriptional activity and of the receptor's ability to dimerize when increasing the DHT levels. With V770 located outside of the proposed LBD dimerization interface of the AR LBD homodimer crystal structure, the effects of the V770A mutation on AR dimerization were unexpected. We therefore explored whether the AR LBD dimerization interface would be better described by an alternative dimerization mode based on available human homodimeric LBD crystal structures of other nuclear receptors. Superposition of the monomeric AR LBD in the homodimeric crystal structures of GR, PR, ER, CAR, TR\u03b2, and HNF\u20104\u03b1 showed that the GR\u2010like LBD dimer model was energetically the most stable. Moreover, V770 was a key energy residue in the GR\u2010like LBD dimer while it was not involved in the stabilization of the AR LBD homodimer according to the crystal structure. Additionally, the observation that 4 AIS mutations impacted the stability of the AR LBD dimer while 16 mutations affected the GR\u2010like LBD dimer, suggested that the AR LBD dimer crystal is a snapshot of a breathing AR LBD homodimer that can transition into the GR\u2010like LBD dimer model.<\/jats:p>","DOI":"10.1002\/pro.4599","type":"journal-article","created":{"date-parts":[[2023,2,21]],"date-time":"2023-02-21T04:00:53Z","timestamp":1676952053000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Study of novel androgen receptor <scp>V770<\/scp> variant in androgen insensitivity syndrome patients reveals the transitional state of the androgen receptor ligand binding domain homodimer"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1048-2798","authenticated-orcid":false,"given":"Christine","family":"Helsen","sequence":"first","affiliation":[{"name":"Molecular Endocrinology 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