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HIP2/LIG

Function

Accepts ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins. In vitro, in the presence or in the absence of BRCA1-BARD1 E3 ubiquitin-protein ligase complex, catalyzes the synthesis of 'Lys-48'-linked polyubiquitin chains. Does not transfer ubiquitin directly to but elongates monoubiquitinated substrate protein. Mediates the selective degradation of short-lived and abnormal proteins, such as the endoplasmic reticulum-associated degradation (ERAD) of misfolded lumenal proteins. Ubiquitinates huntingtin. May mediate foam cell formation by the suppression of apoptosis of lipid-bearing macrophages through ubiquitination and subsequence degradation of p53/TP53. Proposed to be involved in ubiquitination and proteolytic processing of NF-kappa-B; in vitro supports ubiquitination of NFKB1. In case of infection by cytomegaloviruses may be involved in the US11-dependent degradation of MHC class I heavy chains following their export from the ER to the cytosol. In case of viral infections may be involved in the HPV E7 protein-dependent degradation of RB1.

Pathway

Protein modification; protein ubiquitination.

Post-translational modifications

Sumoylation at Lys-14 impairs catalytic activity.

Sequence similarities

Belongs to the ubiquitin-conjugating enzyme family.

Tissue specificity

Expressed in all tissues tested, including spleen, thymus, prostate, testis, ovary, small intestine, colon, peripheral blood leukocytes, T-lymphocytes, monocytes, granulocytes and bone marrow mononuclear cells. Highly expressed in brain, with highest levels found in cortex and striatum and at lower levels in cerebellum and brainstem.

Cellular localization

  • Cytoplasm

Alternative names

  • Ubiquitin-conjugating enzyme E2 K
  • E2 ubiquitin-conjugating enzyme K
  • Huntingtin-interacting protein 2
  • Ubiquitin carrier protein
  • Ubiquitin-conjugating enzyme E2-25 kDa
  • Ubiquitin-protein ligase
  • HIP-2
  • Ubiquitin-conjugating enzyme E2(25K)
  • Ubiquitin-conjugating enzyme E2-25K
  • LIG
  • HIP2
  • UBE2K

Target type

Proteins

Molecular weight

22407Da