6q01

<StructureSection load='6q01' size='340' side='right'caption='[[6q01]], [[Resolution|resolution]] 0.85&Aring;' scene=''>

<table><tr><td colspan='2'>[[6q01]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6Q01 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6Q01 FirstGlance]. <br>

</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 0.851&#8491;</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6q01 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6q01 OCA], [https://pdbe.org/6q01 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6q01 RCSB], [https://www.ebi.ac.uk/pdbsum/6q01 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6q01 ProSAT]</span></td></tr>

== Function ==

[https://www.uniprot.org/uniprot/RS27A_BOVIN RS27A_BOVIN] 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 (By similarity). Ribosomal protein S27a is a component of the 40S subunit of the ribosome.

==See Also==

*[[Phosphodiesterase 3D structures|Phosphodiesterase 3D structures]]

*[[3D structures of ubiquitin|3D structures of ubiquitin]]

[[Category: Bos taurus]]

[[Category: Homo sapiens]]