FEATURES

FAMILY

DESCRIPTION

Also known as TRIM5_MACMU, TRIM5. Capsid-specific restriction factor that prevents infection from non-host-adapted retroviruses. Blocks viral replication early in the life cycle, after viral entry but before reverse transcription. In addition to acting as a capsid-specific restriction factor, also acts as a pattern recognition receptor that activates innate immune signaling in response to the retroviral capsid lattice. Binding to the viral capsid triggers its E3 ubiquitin ligase activity, and in concert with the heterodimeric ubiquitin conjugating enzyme complex UBE2V1-UBE2N (also known as UBC13-UEV1A complex) generates 'Lys-63'-linked polyubiquitin chains, which in turn are catalysts in the autophosphorylation of the MAP3K7/TAK1 complex (includes TAK1, TAB2, and TAB3). Activation of the MAP3K7/TAK1 complex by autophosphorylation results in the induction and expression of NF-kappa-B and MAPK-responsive inflammatory genes, thereby leading to an innate immune response in the infected cell. Restricts infection by human immunodeficiency virus type 1 (HIV-1) and simian immunodeficiency virus (SIV-agm). Plays a role in regulating autophagy through activation of autophagy regulator BECN1 by causing its dissociation from its inhibitors BCL2 and TAB2 (PubMed:25127057). Also plays a role in autophagy by acting as a selective autophagy receptor which recognizes and targets HIV-1 capsid protein p24 for autophagic destruction (PubMed:25127057). Can form homodimers and homotrimers. In addition to lower-order dimerization, also exhibits a higher-order multimerization and both low- and high-order multimerizations are essential for its restriction activity. Interacts with MAP3K7/TAK1, TAB2 and TAB3 (By similarity). Interacts with HSPA8/HSC70, PSMC2, PSMC4, PSMC5 and PSMD7 (PubMed:20053985, PubMed:22078707). Interacts with SQSTM1 (PubMed:20357094, PubMed:25127057). Interacts (via B30.2/SPRY domain) with HSPA1A/B. Interacts with TRIM6 and TRIM34 (PubMed:21680743). Interacts with BECN1; GABARAP (PubMed:25127057). Interacts with ULK1 (phosphorylated form), GABARAPL1, GABARAPL2, MAP1LC3A and MAP1LC3C (By similarity).

EXTERNAL LINKS

TRIM5

Tripartite motif-containing protein 5

TRIM5

Molecular Synopsis