Cullin-RING E3 ubiquitin ligases (CRLs) are regulated by the eight-subunit COP9 signalosome (CSN). Enzymatically, CSN functions as an isopeptidase that removes the ubiquitin-like activator NEDD8 from CRLs, but it can also bind deneddylated CRLs and m ...
Cullin-RING E3 ubiquitin ligases (CRLs) are regulated by the eight-subunit COP9 signalosome (CSN). Enzymatically, CSN functions as an isopeptidase that removes the ubiquitin-like activator NEDD8 from CRLs, but it can also bind deneddylated CRLs and maintain them in an inactive state. The CSN subunits CSN1, CSN2, CSN3, CSN4, CSN7 and CSN8, share a common domain composition: an N-terminal array of tandem alpha-helical tetratricopeptide/-like repeats, a 34 residue motif, followed by a PCI domain, which encompasses a WH subdomain, a linker, and one or two alpha-helices at the C-terminus. This entry describes the C-terminal helices found on CSN4. The two helices from CSN4 (helices I and II) form a brace roughly perpendicular to the bundle axis in contact with the three C-terminal helices of CSN6. CSN5, whose two C-terminal helices form an antiparallel hairpin, inserts its final C-terminal helix (helix II) into the central CSN6 framework at the core of the bundle. Both CSN1 and CSN4 are dependent on the presence of their C-terminal helix (CSN1 isoform-2 residues: 466-527; and CSN4: 364-406) for integration into CSN. COP9 signalosome shares common architecture with the 26S proteasome lid and eIF3 where the 19S lid subunit RPN5 and the eIF3 core subunit eIF3a share significant structural similarity with CSN4 [1].
This family contains a number of ubiquitin-like proteins: SUMO (smt3 homologue) (see Swiss:Q02724), Nedd8 (see Swiss:P29595), Elongin B (see Swiss:Q15370), Rub1 (see Swiss:Q9SHE7), and Parkin (see Swiss:O60260). A number of them are thought to carry ...
This family contains a number of ubiquitin-like proteins: SUMO (smt3 homologue) (see Swiss:Q02724), Nedd8 (see Swiss:P29595), Elongin B (see Swiss:Q15370), Rub1 (see Swiss:Q9SHE7), and Parkin (see Swiss:O60260). A number of them are thought to carry a distinctive five-residue motif termed the proteasome-interacting motif (PIM), which may have a biologically significant role in protein delivery to proteasomes and recruitment of proteasomes to transcription sites [5].
There are 8 cysteine/ histidine residues which are proposed to be the conserved residues involved in zinc binding. The protein, of which this domain is the conserved region, participates in diverse functions relevant to chromosome metabolism and cell ...
There are 8 cysteine/ histidine residues which are proposed to be the conserved residues involved in zinc binding. The protein, of which this domain is the conserved region, participates in diverse functions relevant to chromosome metabolism and cell cycle control [1].
This is the C-terminal helix from COP9 signalosome complex subunit 1, an essential component of the COP9 signalosome complex (CSN), which involved in various cellular and developmental processes [1,2].
This is the neddylation site of cullin proteins which are a family of structurally related proteins containing an evolutionarily conserved cullin domain. With the exception of APC2, each member of the cullin family is modified by Nedd8 and several cu ...
This is the neddylation site of cullin proteins which are a family of structurally related proteins containing an evolutionarily conserved cullin domain. With the exception of APC2, each member of the cullin family is modified by Nedd8 and several cullins function in Ubiquitin-dependent proteolysis, a process in which the 26S proteasome recognises and subsequently degrades a target protein tagged with K48-linked poly-ubiquitin chains. Cullins are molecular scaffolds responsible for assembling the ROC1/Rbx1 RING-based E3 ubiquitin ligases, of which several play a direct role in tumorigenesis. Nedd8/Rub1 is a small ubiquitin-like protein, which was originally found to be conjugated to Cdc53, a cullin component of the SCF (Skp1-Cdc53/CUL1-F-box protein) E3 Ub ligase complex in Saccharomyces cerevisiae, and Nedd8 modification has now emerged as a regulatory pathway of fundamental importance for cell cycle control and for embryogenesis in metazoans. The only identified Nedd8 substrates are cullins. Neddylation results in covalent conjugation of a Nedd8 moiety onto a conserved cullin lysine residue [1].
This family contains a number of ubiquitin-like proteins: SUMO (smt3 homologue) (see Swiss:Q02724), Nedd8 (see Swiss:P29595), Elongin B (see Swiss:Q15370), Rub1 (see Swiss:Q9SHE7), and Parkin (see Swiss:O60260). A number of them are thought to carry ...
This family contains a number of ubiquitin-like proteins: SUMO (smt3 homologue) (see Swiss:Q02724), Nedd8 (see Swiss:P29595), Elongin B (see Swiss:Q15370), Rub1 (see Swiss:Q9SHE7), and Parkin (see Swiss:O60260). A number of them are thought to carry a distinctive five-residue motif termed the proteasome-interacting motif (PIM), which may have a biologically significant role in protein delivery to proteasomes and recruitment of proteasomes to transcription sites [5].
This domain is found in COP9 signalosome complex subunit 3 from humans (CSN3) and similar proteins predominantly found in vertebrates. CSN3 is a component of the eight-subunit COP9 signalosome complex (CSN), which inactivate Cullin-RING E3 ubiquitin ...
This domain is found in COP9 signalosome complex subunit 3 from humans (CSN3) and similar proteins predominantly found in vertebrates. CSN3 is a component of the eight-subunit COP9 signalosome complex (CSN), which inactivate Cullin-RING E3 ubiquitin ligases (CRLs) by removing their covalently attached activator, NEDD8. This entry represents the C-terminal helical decoration of this protein [1,2].
The COP9 (Constitutive photomorphogenesis 9) signalosome (CSN), a large multiprotein complex that resembles the 19S lid of the 26S proteasome, plays a central role in the regulation of the E3-cullin RING ubiquitin ligases (CRLs) [1]. The catalytic ac ...
The COP9 (Constitutive photomorphogenesis 9) signalosome (CSN), a large multiprotein complex that resembles the 19S lid of the 26S proteasome, plays a central role in the regulation of the E3-cullin RING ubiquitin ligases (CRLs) [1]. The catalytic activity of the CSN complex is carried by subunit 5 (CSN5), also known as c-Jun activation domain-binding protein-1 (Jab1) [1]. This entry is the C-terminal domain found in CSN5 proteins. CSN5, whose two C-terminal helices form an antiparallel hairpin, inserts its final C-terminal helix (helix II) into the central CSN6 framework at the core of the bundle. Deletion of the C-terminal helices has a pronounced effect on CSN integrity [2].
COP9 signalosome complex subunit 7a helix I domain
This is The C-terminal helix I domain found in COP9 signalosome complex subunit 7a. The helix from CSN7 (helix I) contacts CSN6 helices I and II at the base of the bundle, nearest the PCI ring [1].
VHL forms a ternary complex with the elonginB Swiss:O44226 and elonginC Swiss:O13292 proteins. This complex binds Cul2, which then is involved in regulation of vascular endothelial growth factor Swiss:P15692 mRNA.
