Protein: Sequestosome-1 (Protein kinase C-zeta-interacting protein) (PKC-zeta-interacting protein) (Ubiquitin-binding protein p62) (O08623)
Organism: Rattus norvegicus (Rat)
Function: Autophagy receptor required for selective macroautophagy (aggrephagy) (By similarity). Functions as a bridge between polyubiquitinated cargo and autophagosomes (By similarity). Interacts directly with both the cargo to become degraded and an autophagy modifier of the MAP1 LC3 family (By similarity). Along with WDFY3, involved in the formation and autophagic degradation of cytoplasmic ubiquitin-containing inclusions (p62 bodies, ALIS/aggresome-like induced structures) (By similarity). Along with WDFY3, required to recruit ubiquitinated proteins to PML bodies in the nucleus (By similarity). Also involved in autophagy of peroxisomes (pexophagy) in response to reactive oxygen species (ROS) by acting as a bridge between ubiquitinated PEX5 receptor and autophagosomes (By similarity). May regulate the activation of NFKB1 by TNF-alpha, nerve growth factor (NGF) and interleukin-1. May play a role in titin/TTN downstream signaling in muscle cells (By similarity). May regulate signaling cascades through ubiquitination (By similarity). Adapter that mediates the interaction between TRAF6 and CYLD (By similarity). May be involved in cell differentiation, apoptosis, immune response and regulation of K(+) channels (By similarity). Involved in endosome organization by retaining vesicles in the perinuclear cloud: following ubiquitination by RNF26, attracts specific vesicle-associated adapters, forming a molecular bridge that restrains cognate vesicles in the perinuclear region and organizes the endosomal pathway for efficient cargo transport (By similarity). Promotes relocalization of 'Lys-63'-linked ubiquitinated STING1 to autophagosomes (By similarity). Acts as an activator of the NFE2L2/NRF2 pathway via interaction with KEAP1: interaction inactivates the BCR(KEAP1) complex, promoting nuclear accumulation of NFE2L2/NRF2 and subsequent expression of cytoprotective genes (By similarity). Sequesters tensin TNS2 into cytoplasmic puncta, promoting TNS2 ubiquitination and proteasomal degradation (By similarity).
Subcellular location: Cytoplasmic vesicle, autophagosome {ECO:0000250|UniProtKB:Q13501}. Preautophagosomal structure {ECO:0000250|UniProtKB:Q13501}. Cytoplasm, cytosol {ECO:0000250|UniProtKB:Q64337}. Nucleus, PML body {ECO:0000250|UniProtKB:Q13501}. Late endosome {ECO:0000250|UniProtKB:Q13501}. Lysosome {ECO:0000250|UniProtKB:Q13501}. Nucleus {ECO:0000250|UniProtKB:Q64337}. Endoplasmic reticulum {ECO:0000250|UniProtKB:Q13501}. Cytoplasm, myofibril, sarcomere {ECO:0000269|PubMed:15802564}. Note=In cardiac muscle, localizes to the sarcomeric band (PubMed:15802564). Localizes to cytoplasmic membraneless inclusion bodies, known as p62 bodies, containing polyubiquitinated protein aggregates (By similarity). In protein aggregate diseases of the liver, found in large amounts in Mallory bodies of alcoholic and nonalcoholic steatohepatitis, hyaline bodies in hepatocellular carcinoma, and in SERPINA1 aggregates. Enriched in Rosenthal fibers of pilocytic astrocytoma. In the cytoplasm, observed in both membrane-free ubiquitin-containing protein aggregates (sequestosomes) and membrane-surrounded autophagosomes. Colocalizes with TRIM13 in the perinuclear endoplasmic reticulum. Co-localizes with TRIM5 in cytoplasmic bodies. When nuclear export is blocked by treatment with leptomycin B, accumulates in PML bodies (By similarity). {ECO:0000250|UniProtKB:Q13501, ECO:0000250|UniProtKB:Q64337, ECO:0000269|PubMed:15802564}.
Interaction partners:
- Microtubule-associated protein 1 light chain 3 alpha
- Microtubule-associated protein 1 light chain 3 beta
- TNF receptor-associated factor 6
- Kelch-like ECH-associated protein 1
- Gamma-aminobutyric acid receptor-associated protein
- Next to BRCA1 gene 1 protein
- Protein kinase C zeta type
- Serine/threonine-protein kinase TBK1
- Gamma-aminobutyric acid receptor-associated protein-like 1
- Ubiquitin carboxyl-terminal hydrolase CYLD
Sequence:
MASLTVKAYLLGKEEAAREIRRFSFCFSPEPEAEAAAGPGPCERLLSRVAVLFPALRPGGFQAHYRDEDGDLVAFSSDEELTMAMSYVKDDIFRIYIKEKKECRREHRPPCAQEARSMVHPNVICDGCNGPVVGTRYKCSVCPDYDLCSVCEGKGLHREHSKLIFPNPFGHLSDSFSHSRWLRKLKHGHFGWPGWEMGPPGNWSPRPPRAGDGRPCPTAESASAPSEDPNVNFLKNVGESVAAALSPLGIEVDIDVEHGGKRSRLTPTSAESSSTGTEDKSGTQPSSCSSEVSKPDGAGEGPAQSLTEQMKKIALESVGQPEELMESDNCSGGDDDWTHLSSKEVDPSTGELQSLQMPESEGPSSLDPSQEGPTGLKEAALYPHLPPEADPRLIESLSQMLSMGFSDEGGWLTRLLQTKNYDIGAALDTIQYSKHPPPL