3ptf: Difference between revisions
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{{STRUCTURE_3ptf| PDB=3ptf | SCENE= }} | {{STRUCTURE_3ptf| PDB=3ptf | SCENE= }} | ||
===X-ray structure of the non-covalent complex between UbcH5A and Ubiquitin=== | ===X-ray structure of the non-covalent complex between UbcH5A and Ubiquitin=== | ||
{{ABSTRACT_PUBMED_21396940}} | |||
==Function== | |||
[[http://www.uniprot.org/uniprot/UB2D1_HUMAN UB2D1_HUMAN]] Accepts ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins. In vitro catalyzes 'Lys-48'-linked polyubiquitination. Mediates the selective degradation of short-lived and abnormal proteins. Functions in the E6/E6-AP-induced ubiquitination of p53/TP53. Mediates ubiquitination of PEX5 and auto-ubiquitination of STUB1, TRAF6 and TRIM63/MURF1. Ubiquitinates STUB1-associated HSP90AB1 in vitro. Lacks inherent specificity for any particular lysine residue of ubiquitin. Essential for viral activation of IRF3. Mediates polyubiquitination of CYP3A4.<ref>PMID:18042044</ref> <ref>PMID:18359941</ref> <ref>PMID:19103148</ref> <ref>PMID:19854139</ref> <ref>PMID:20061386</ref> [[http://www.uniprot.org/uniprot/UBB_HUMAN UBB_HUMAN]] Ubiquitin exists either covalently attached to another protein, or free (unanchored). When covalently bound, it is conjugated to target proteins via an isopeptide bond either as a monomer (monoubiquitin), a polymer linked via different Lys residues of the ubiquitin (polyubiquitin chains) or a linear polymer linked via the initiator Met of the ubiquitin (linear polyubiquitin chains). Polyubiquitin chains, when attached to a target protein, have different functions depending on the Lys residue of the ubiquitin that is linked: Lys-6-linked may be involved in DNA repair; Lys-11-linked is involved in ERAD (endoplasmic reticulum-associated degradation) and in cell-cycle regulation; Lys-29-linked is involved in lysosomal degradation; Lys-33-linked is involved in kinase modification; Lys-48-linked is involved in protein degradation via the proteasome; Lys-63-linked is involved in endocytosis, DNA-damage responses as well as in signaling processes leading to activation of the transcription factor NF-kappa-B. Linear polymer chains formed via attachment by the initiator Met lead to cell signaling. Ubiquitin is usually conjugated to Lys residues of target proteins, however, in rare cases, conjugation to Cys or Ser residues has been observed. When polyubiquitin is free (unanchored-polyubiquitin), it also has distinct roles, such as in activation of protein kinases, and in signaling.<ref>PMID:16543144</ref> <ref>PMID:19754430</ref> | |||
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==About this Structure== | ==About this Structure== | ||
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==Reference== | ==Reference== | ||
<ref group="xtra">PMID:021396940</ref><references group="xtra"/> | <ref group="xtra">PMID:021396940</ref><references group="xtra"/><references/> | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Ubiquitin--protein ligase]] | [[Category: Ubiquitin--protein ligase]] | ||
[[Category: Bosanac, I.]] | [[Category: Bosanac, I.]] | ||
[[Category: Hymowitz, S G.]] | [[Category: Hymowitz, S G.]] | ||
[[Category: Alpha/beta]] | |||
[[Category: E2]] | |||
[[Category: Ligase]] | |||
[[Category: Protein-protein complex]] | |||
[[Category: Ubiquitin]] | |||
[[Category: Ubiquitin conjugating enzyme]] | |||
