Protein: Caprin-1 (Q14444)
Organism: Homo sapiens (Human)
Function: mRNA-binding protein that acts as a regulator of mRNAs transport, translation and/or stability, and which is involved in neurogenesis, synaptic plasticity in neurons and cell proliferation and migration in multiple cell types. Plays an essential role in cytoplasmic stress granule formation. Acts as an mRNA regulator by mediating formation of some phase-separated membraneless compartment: undergoes liquid-liquid phase separation upon binding to target mRNAs, leading to assemble mRNAs into cytoplasmic ribonucleoprotein granules that concentrate mRNAs with associated regulatory factors. Undergoes liquid-liquid phase separation following phosphorylation and interaction with FMR1, promoting formation of cytoplasmic ribonucleoprotein granules that concentrate mRNAs with factors that inhibit translation and mediate deadenylation of target mRNAs. In these cytoplasmic ribonucleoprotein granules, CAPRIN1 mediates recruitment of CNOT7 deadenylase, leading to mRNA deadenylation and degradation. Binds directly and selectively to MYC and CCND2 mRNAs. In neuronal cells, directly binds to several mRNAs associated with RNA granules, including BDNF, CAMK2A, CREB1, MAP2, NTRK2 mRNAs, as well as to GRIN1 and KPNB1 mRNAs, but not to rRNAs
Subcellular location: Cytoplasm, Cytoplasmic ribonucleoprotein granule. Cytoplasm, cytosol. Cell projection, dendrite. Cell projection, lamellipodium. Note=Mediates formation and localizes to cytoplasmic ribonucleoprotein membraneless compartments. Associated with RNA granules. At the leading edge of migrating fibroblasts, colocalizes with DDX3X
Sequence: MPSATSHSGSGSKSSGPPPPSGSSGSEAAAGAGAAAPASQHPATGTGAVQTEAMKQILGVIDKKLRNLEKKKGKLDDYQERMNKGERLNQDQLDAVSKYQEVTNNLEFAKELQRSFMALSQDIQKTIKKTARREQLMREEAEQKRLKTVLELQYVLDKLGDDEVRTDLKQGLNGVPILSEEELSLLDEFYKLVDPERDMSLRLNEQYEHASIHLWDLLEGKEKPVCGTTYKVLKEIVERVFQSNYFDSTHNHQNGLCEEEEAASAPAVEDQVPEAEPEPAEEYTEQSEVESTEYVNRQFMAETQFTSGEKEQVDEWTVETVEVVNSLQQQPQAASPSVPEPHSLTPVAQADPLVRRQRVQDLMAQMQGPYNFIQDSMLDFENQTLDPAIVSAQPMNPTQNMDMPQLVCPPVHSESRLAQPNQVPVQPEATQVPLVSSTSEGYTASQPLYQPSHATEQRPQKEPIDQIQATISLNTDQTTASSSLPAASQPQVFQAGTSKPLHSSGINVNAAPFQSMQTVFNMNAPVPPVNEPETLKQQNQYQASYNQSFSSQPHQVEQTELQQEQLQTVVGTYHGSPDQSHQVTGNHQQPPQQNTGFPRSNQPYYNSRGVSRGGSRGARGLMNGYRGPANGFRGGYDGYRPSFSNTPNSGYTQSQFSAPRDYSGYQRDGYQQNFKRGSGQSGPRGAPRGRGGPPRPNRGMPQMNTQQVN
InterPro domains: - IPR028816: Caprin (family) [33-695]
- IPR041637: Caprin-1 dimerization domain (domain) [132-247]
- IPR022070: Cytoplasmic activation/proliferation-associated protein-1 C term (domain) [359-685]
Interaction partners: - Ras GTPase-activating protein-binding protein 1
- Ras GTPase-activating protein-binding protein 2
- Fragile X messenger ribonucleoprotein 1
- RNA cytidine acetyltransferase
- Ubiquitin carboxyl-terminal hydrolase 10
- RNA-binding protein FXR2
- RNA-binding protein FXR1
- Nucleolysin TIAR
- Cytotoxic granule associated RNA binding protein TIA1
- Polyadenylate-binding protein 1
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0097159 (organic cyclic compound binding), GO:1901363 (heterocyclic compound binding), GO:0005515 (protein binding), GO:0003676 (nucleic acid binding), GO:0003723 (RNA binding)
Biological Process (BP): GO:0008150 (biological process), GO:0065007 (biological regulation), GO:0050789 (regulation of biological process), GO:0048519 (negative regulation of biological process), GO:0019222 (regulation of metabolic process), GO:0050794 (regulation of cellular process), GO:0048523 (negative regulation of cellular process), GO:0009892 (negative regulation of metabolic process), GO:0051172 (negative regulation of nitrogen compound metabolic process), GO:0010605 (negative regulation of macromolecule metabolic process), GO:0009889 (regulation of biosynthetic process), GO:0051171 (regulation of nitrogen compound metabolic process), GO:0060255 (regulation of macromolecule metabolic process), GO:0031323 (regulation of cellular metabolic process), GO:0009890 (negative regulation of biosynthetic process), GO:0080090 (regulation of primary metabolic process), GO:0031324 (negative regulation of cellular metabolic process), GO:0034248 (regulation of amide metabolic process), GO:0010556 (regulation of macromolecule biosynthetic process), GO:0051246 (regulation of protein metabolic process), GO:0051248 (negative regulation of protein metabolic process), GO:0031326 (regulation of cellular biosynthetic process), GO:0010558 (negative regulation of macromolecule biosynthetic process), GO:0031327 (negative regulation of cellular biosynthetic process), GO:0010629 (negative regulation of gene expression), GO:0010468 (regulation of gene expression), GO:0034249 (negative regulation of amide metabolic process), GO:0017148 (negative regulation of translation), GO:2000112 (regulation of cellular macromolecule biosynthetic process), GO:0006417 (regulation of translation), GO:2000113 (negative regulation of cellular macromolecule biosynthetic process), GO:0010608 (post-transcriptional regulation of gene expression)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0031252 (cell leading edge), GO:0005829 (cytosol), GO:0005622 (intracellular anatomical structure), GO:0005737 (cytoplasm), GO:0016020 (membrane)