6c16: Difference between revisions
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==Ubiquitin variant (UbV.Fbl10.1) bound to a human Skp1-Fbl11 fragment complex.== | |||
<StructureSection load='6c16' size='340' side='right' caption='[[6c16]], [[Resolution|resolution]] 3.27Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[6c16]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6C16 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6C16 FirstGlance]. <br> | |||
</td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/[Histone_H3]-lysine-36_demethylase [Histone H3]-lysine-36 demethylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.14.11.27 1.14.11.27] </span></td></tr> | |||
[[Category: | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6c16 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6c16 OCA], [http://pdbe.org/6c16 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6c16 RCSB], [http://www.ebi.ac.uk/pdbsum/6c16 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6c16 ProSAT]</span></td></tr> | ||
</table> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/SKP1_HUMAN SKP1_HUMAN]] Essential component of the SCF (SKP1-CUL1-F-box protein) ubiquitin ligase complex, which mediates the ubiquitination of proteins involved in cell cycle progression, signal transduction and transcription. In the SCF complex, serves as an adapter that links the F-box protein to CUL1. SCF(BTRC) mediates the ubiquitination of NFKBIA at 'Lys-21' and 'Lys-22'; the degradation frees the associated NFKB1-RELA dimer to translocate into the nucleus and to activate transcription. SCF(Cyclin F) directs ubiquitination of CP110.<ref>PMID:16209941</ref> <ref>PMID:20181953</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> [[http://www.uniprot.org/uniprot/KDM2A_HUMAN KDM2A_HUMAN]] Histone demethylase that specifically demethylates 'Lys-36' of histone H3, thereby playing a central role in histone code. Preferentially demethylates dimethylated H3 'Lys-36' residue while it has weak or no activity for mono- and tri-methylated H3 'Lys-36'. May also recognize and bind to some phosphorylated proteins and promote their ubiquitination and degradation. Required to maintain the heterochromatic state. Associates with centromeres and represses transcription of small non-coding RNAs that are encoded by the clusters of satellite repeats at the centromere. Required to sustain centromeric integrity and genomic stability, particularly during mitosis.<ref>PMID:16362057</ref> <ref>PMID:19001877</ref> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Manczyk, N]] | |||
[[Category: Sicheri, F]] | [[Category: Sicheri, F]] | ||
[[Category: | [[Category: Protein binding]] | ||
[[Category: Ubiquitination]] | |||