Protein
E3 ubiquitin-protein ligase RSP5
Organism
Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139)
Function
E3 ubiquitin-protein ligase which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Probably involved in the regulatory network controlling carbon source utilization. Ubiquitinates 'Lys-528' of the uric acid/xanthine transporter uapA at the cell membrane, leading to its internalization, sorting into the endosomal pathway to the vacuolar lumen where it is eventually degraded.
Similarity
Belongs to the RSP5/NEDD4 family.
Sequence
MGSNLPAQPNLRVTIIAADGLYKRDVFRLPDPFAVATVGGEQTHTTSVIKKTLNPYWNEMFDLRVNEDSILAIQIFDQKKFKKKDQGFLGVINVRIGDVIDLQMGGDEMLTRDLKKSNDNLVVHGKLIINLSTNLSTPNPNQANGLHRTQLGASTSSGLVPQVAPTPSVPQAGPSSVDQSAAASSASLNPQRVPSATRPTSQIAPPNGAPPIANGQGVPRPNLSSFEDNQGRLPAGWERREDNLGRTYYVDHNTRTTTWNRPSANYNEQTQRTQREANMQLERRAHQNRMLPEDRTGASSPNLSETQPQAQTPPAGGSGASNSNVVSMMATGATTAGTGELPPGWEQRTTPEGRPYFVDHNTRTTTWVDPRRQQYIRMYGQNASGGNTTIQQQPVSQLGPLPSGWEMRLTNTARVYFVDHNTKTTTWDDPRLPSSLDQGVPQYKRDFRRKLIYFRSQPALRIMSGQCHVKVRRNNIFEDSYAEIMRQSASDLKKRLMIKFDGEDGLDYGGLSREFFFLLSHEMFNPFYCLFEYSAHDNYTLQINPHSGVNPEHLNYFKFIGRVVGLAIFHRRFLDSFFIGAFYKMMLRKKVSLQDMEGVDEDLHRNLTWTLENDIEGIIDLTFTVDDEKFGERRTIELKPGGEDIPVTNENKHEYVELVTEWKIVKRVEEQFNAFMSGFNELIPADLVNVFDERELELLIGGIADIDVDDWKKHTDYRGYQEQDEVIQNFWKIVRTWDAEQKSRLLQFTTGTSRIPVNGFKDLQGSDGPRRFTIEKSGDPIALPKSHTCFNRLDLPPYKSHEVLEHKLSIAVEETLGFGQE