UNIPROT #

Q13616

PROTEIN NAME

Cullin 1

SYNONYMS

CUL 1 antibody; CUL-1 antibody; CUL1 antibody; CUL1_HUMAN antibody; Cullin-1 antibody; Cullin1 antibody; MGC149834 antibody; MGC149835 antibody

SEQUENCE SIMILARITIES

Belongs to the cullin family.

TISSUE SPECIFICITY

Expressed in lung fibroblasts.

POST-TRANSLATIONAL MODIFICATION

Neddylated; which enhances the ubiquitination activity of SCF and prevents binding of the inhibitor CAND1. Deneddylated via its interaction with the COP9 signalosome (CSN) complex.; (Microbial infection) Deneddylated by Epstein-Barr virus BPLF1 leading to a S-phase-like environment that is required for efficient replication of the viral genome.

SUBCELLULAR LOCATION

Cytoplasm, Nucleoplasm.

FUNCTION

Cullin proteins comprise a distinct family of mediators that participate in the selective targeting of proteins for ubiquitin (Ub)-mediated proteolysis. CUL-1, which is the mammalian homolog of yeast Cdc53, is an integral component of the E3 ubiquitin ligase complex designated SCF. The SCF (Skp1/CUL-1/F-box protein complex) consists of Skp1 associating with both CUL-1 and an F-box protein, such as Skp2, which determines the substrate specificity of the complex. CUL-1-mediated ubiquitination results in the degradation of cell cycle proteins cyclin D, p21 and cyclin E. Another cullin, CUL-3, facilitates the degradation of cyclin E independent of SCF activity, while CUL-2 associates with the tumor suppressing protein VHL and elongin B to form VBC complexes, which structurally resemble the SCF ligase. Proteolysis also occurs by way of CUL-4 associating with Nedd-8, a ubiquitin-like protein, where it too functions as an active component of a multifunctional E3 complex. CUL-5, also designated vasopressin-activated, calcium-mobilizing protein (VACM-1), is also included in the cullin family as it shares substantial sequence homology with CUL-1.