ID RAB8A_RAT Reviewed; 207 AA. AC P35280; Q3B8Q4; Q6DKL2; DT 01-FEB-1994, integrated into UniProtKB/Swiss-Prot. DT 22-NOV-2005, sequence version 2. DT 02-SEP-2026, entry version 206. DE RecName: Full=Ras-related protein Rab-8A; DE EC=3.6.5.2 {ECO:0000250|UniProtKB:P61006}; DE Flags: Precursor; GN Name=Rab8a {ECO:0000312|RGD:621144}; Synonyms=Rab8; OS Rattus norvegicus (Rat). OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; OC Eutheria; Euarchontoglires; Glires; Rodentia; Myomorpha; Muroidea; Muridae; OC Murinae; Rattus. OX NCBI_TaxID=10116; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA]. RC TISSUE=Lung, and Testis; RX PubMed=15489334; DOI=10.1101/gr.2596504; RG The MGC Project Team; RT "The status, quality, and expansion of the NIH full-length cDNA project: RT the Mammalian Gene Collection (MGC)."; RL Genome Res. 14:2121-2127(2004). RN [2] RP NUCLEOTIDE SEQUENCE [MRNA] OF 73-207. RC STRAIN=Sprague-Dawley; TISSUE=Brain; RX PubMed=1313420; DOI=10.1016/s0021-9258(18)42619-1; RA Elferink L.A., Anzai K., Scheller R.H.; RT "Rab15, a novel low molecular weight GTP-binding protein specifically RT expressed in rat brain."; RL J. Biol. Chem. 267:5768-5775(1992). RN [3] RP FUNCTION IN EXOCYTOSIS, AND ACTIVITY REGULATION. RX PubMed=21041651; DOI=10.1073/pnas.1009523107; RA Sun Y., Bilan P.J., Liu Z., Klip A.; RT "Rab8A and Rab13 are activated by insulin and regulate GLUT4 translocation RT in muscle cells."; RL Proc. Natl. Acad. Sci. U.S.A. 107:19909-19914(2010). RN [4] RP PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-181, AND IDENTIFICATION BY RP MASS SPECTROMETRY [LARGE SCALE ANALYSIS]. RX PubMed=22673903; DOI=10.1038/ncomms1871; RA Lundby A., Secher A., Lage K., Nordsborg N.B., Dmytriyev A., Lundby C., RA Olsen J.V.; RT "Quantitative maps of protein phosphorylation sites across 14 different rat RT organs and tissues."; RL Nat. Commun. 3:876-876(2012). CC -!- FUNCTION: The small GTPases Rab are key regulators of intracellular CC membrane trafficking, from the formation of transport vesicles to their CC fusion with membranes. Rabs cycle between an inactive GDP-bound form CC and an active GTP-bound form that is able to recruit to membranes CC different sets of downstream effectors directly responsible for vesicle CC formation, movement, tethering and fusion. RAB8A is involved in CC polarized vesicular trafficking and neurotransmitter release. Together CC with RAB11A, RAB3IP, the exocyst complex, PARD3, PRKCI, ANXA2, CDC42 CC and DNMBP promotes transcytosis of PODXL to the apical membrane CC initiation sites (AMIS), apical surface formation and lumenogenesis (By CC similarity). Regulates the compacted morphology of the Golgi (By CC similarity). Together with MYO5B and RAB11A participates in epithelial CC cell polarization (By similarity). Also involved in membrane CC trafficking to the cilium and ciliogenesis (By similarity). Together CC with MICALL2, may also regulate adherens junction assembly (By CC similarity). May play a role in insulin-induced transport to the plasma CC membrane of the glucose transporter GLUT4 and therefore play a role in CC glucose homeostasis (PubMed:21041651). Involved in autophagy (By CC similarity). Targeted to and stabilized on stressed lysosomes through CC LRRK2 phosphorylation (By similarity). Suppresses stress-induced CC lysosomal enlargement through EHBP1 and EHNP1L1 effector proteins (By CC similarity). {ECO:0000250|UniProtKB:P55258, CC ECO:0000250|UniProtKB:P61006, ECO:0000269|PubMed:21041651}. CC -!- CATALYTIC ACTIVITY: CC Reaction=GTP + H2O = GDP + phosphate + H(+); Xref=Rhea:RHEA:19669, CC ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:37565, CC ChEBI:CHEBI:43474, ChEBI:CHEBI:58189; EC=3.6.5.2; CC Evidence={ECO:0000250|UniProtKB:P61006}; CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:19670; CC Evidence={ECO:0000250|UniProtKB:P61006}; CC -!- COFACTOR: CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420; CC Evidence={ECO:0000250|UniProtKB:P61006}; CC -!- ACTIVITY REGULATION: Regulated by guanine nucleotide exchange factors CC (GEFs) such as RAB3IP/Rabin8 and RPGR which promote the exchange of CC bound GDP for free GTP, GTPase activating proteins (GAPs) which CC increase the GTP hydrolysis activity, and GDP dissociation inhibitors CC (GDIs) which inhibit the dissociation of the nucleotide from the GTPase CC (By similarity). Activated in response to insulin (PubMed:21041651). CC {ECO:0000250|UniProtKB:P61006, ECO:0000269|PubMed:21041651}. CC -!- SUBUNIT: Interacts (GTP-bound form) with MICALL1; regulates RAB8A CC association with recycling endosomes (By similarity). Interacts with CC MICALL2; competes with RAB13 and is involved in E-cadherin endocytic CC recycling (By similarity). Interacts (GTP-bound form) with MICAL1, CC MICALCL, MICAL3, EHBP1 and EHBP1L1; at least in case of MICAL1, CC MICALCL, MICAL3 and EHBP1L1 two molecules of RAB8A can bind to one CC molecule of the effector protein; ternary complexes of RAB8A, RAB13 and CC either MICAL1 or EHBP1L1 are possible. Interacts with EHD1 (By CC similarity). Interacts with MAP4K2 and SYTL4 (By similarity). Interacts CC with SGSM1 and SGSM3 (By similarity). Interacts with RABIF, RIMS2, CC RPH3A and RPH3A (By similarity). Interacts with OPTN. Interacts with CC RAB3IP, RAB3IP functions as guanine exchange factor (GEF). Interacts CC with MYO5B. Interacts with CIMAP3. Interacts with BIRC6/bruce. CC Interacts with OCRL (By similarity). Interacts with AHI1 (By CC similarity). Interacts with DCDC1. Interacts with LRRK2; interaction CC facilitates phosphorylation of Thr-72. Interacts with RAB31P, GDI1, CC GDI2, CHM, CHML, RABGGTA, RABGGTB, TBC1D15 and INPP5B; these CC interactions are dependent on Thr-72 not being phosphorylated. CC Interacts with RILPL1 and RILPL2; these interactions are dependent on CC the phosphorylation of Thr-72 by LRRK2. Interacts with DZIP1; prevents CC inhibition by the GDP-dissociation inhibitor GDI2. Interacts (in GDP- CC bound form) with RAB3IP/Rabin8, RAB3IP functions as guanine exchange CC factor (GEF) towards RAB8A (By similarity). Interacts (in GDP-bound CC form) with RPGR, RPGR functions as GEF towards RAB8A (By similarity). CC {ECO:0000250|UniProtKB:P55258, ECO:0000250|UniProtKB:P61006}. CC -!- SUBCELLULAR LOCATION: Cell membrane {ECO:0000250|UniProtKB:P55258}; CC Lipid-anchor {ECO:0000250|UniProtKB:P55258}; Cytoplasmic side CC {ECO:0000250|UniProtKB:P55258}. Golgi apparatus CC {ECO:0000250|UniProtKB:P61006}. Endosome membrane CC {ECO:0000250|UniProtKB:P61006}. Recycling endosome membrane CC {ECO:0000250|UniProtKB:P61006}. Cell projection, cilium CC {ECO:0000250|UniProtKB:P61006}. Cytoplasmic vesicle, phagosome membrane CC {ECO:0000250|UniProtKB:P61006, ECO:0000250|UniProtKB:Q92930}; Lipid- CC anchor {ECO:0000250|UniProtKB:Q92930}; Cytoplasmic side CC {ECO:0000250|UniProtKB:Q92930}. Cytoplasm, cytoskeleton, microtubule CC organizing center, centrosome, centriole CC {ECO:0000250|UniProtKB:P55258}. Cytoplasm, cytoskeleton, cilium basal CC body {ECO:0000250|UniProtKB:P55258}. Midbody CC {ECO:0000250|UniProtKB:P61006}. Cytoplasm CC {ECO:0000250|UniProtKB:P61006}. Lysosome CC {ECO:0000250|UniProtKB:P61006}. Note=Colocalizes with OPTN at the Golgi CC complex and in vesicular structures close to the plasma membrane. In CC the GDP-bound form, present in the perinuclear region. Shows a CC polarized distribution to distal regions of cell protrusions in the CC GTP-bound form. Colocalizes with PARD3, PRKCI, EXOC5, OCLN, PODXL and CC RAB11A in apical membrane initiation sites (AMIS) during the generation CC of apical surface and lumenogenesis. Localizes to tubular recycling CC endosome. Recruited to phagosomes containing S.aureus or Mycobacterium CC (By similarity). Non-phosphorylated RAB8A predominantly localizes to CC the cytoplasm whereas phosphorylated RAB8A localizes to the membrane CC (By similarity). Localizes to enlarged lysosomes through LRRK2 CC phosphorylation (By similarity). Colocalizes with RPGR at the primary CC cilia of epithelial cells (By similarity). CC {ECO:0000250|UniProtKB:P61006, ECO:0000250|UniProtKB:P61007}. CC -!- TISSUE SPECIFICITY: Highest levels in spinal cord, heart, kidney and CC lung. CC -!- DOMAIN: Switch 1, switch 2 and the interswitch regions are CC characteristic of Rab GTPases and mediate the interactions with Rab CC downstream effectors. The switch regions undergo conformational changes CC upon nucleotide binding which drives interaction with specific sets of CC effector proteins, with most effectors only binding to GTP-bound Rab. CC {ECO:0000250|UniProtKB:P62820}. CC -!- PTM: Phosphorylation of Thr-72 in the switch II region by LRRK2 CC prevents the association of RAB regulatory proteins, including CHM and CC RAB GDP dissociation inhibitors GDI1 and GDI2 (By similarity). CC Phosphorylation by LRRK2 is required for localization to stressed CC lysosomes (By similarity). {ECO:0000250|UniProtKB:P61006}. CC -!- SIMILARITY: Belongs to the small GTPase superfamily. Rab family. CC {ECO:0000305}. CC -!- SEQUENCE CAUTION: CC Sequence=AAA41997.1; Type=Erroneous initiation; Note=Truncated N-terminus.; Evidence={ECO:0000305}; CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; BC071176; AAH71176.1; -; mRNA. DR EMBL; BC105863; AAI05864.1; -; mRNA. DR EMBL; M83675; AAA41997.1; ALT_INIT; mRNA. DR PIR; A42148; A42148. DR RefSeq; NP_446450.2; NM_053998.2. DR AlphaFoldDB; P35280; -. DR SMR; P35280; -. DR BioGRID; 250675; 5. DR FunCoup; P35280; 3939. DR IntAct; P35280; 3. DR STRING; 10116.ENSRNOP00000020748; -. DR iPTMnet; P35280; -. DR PhosphoSitePlus; P35280; -. DR jPOST; P35280; -. DR PaxDb; 10116-ENSRNOP00000020748; -. DR Ensembl; ENSRNOT00000077789.3; ENSRNOP00000073296.2; ENSRNOG00000014621.9. DR Ensembl; ENSRNOT00055017568; ENSRNOP00055014145; ENSRNOG00055010376. DR Ensembl; ENSRNOT00060018486; ENSRNOP00060014383; ENSRNOG00060010913. DR Ensembl; ENSRNOT00065036890; ENSRNOP00065029710; ENSRNOG00065021689. DR GeneID; 117103; -. DR KEGG; rno:117103; -. DR UCSC; RGD:621144; rat. DR AGR; RGD:621144; -. DR CTD; 4218; -. DR RGD; 621144; Rab8a. DR eggNOG; KOG0078; Eukaryota. DR GeneTree; ENSGT00940000157246; -. DR HOGENOM; CLU_041217_23_1_1; -. DR InParanoid; P35280; -. DR OMA; SKMEQNE; -. DR OrthoDB; 9989112at2759; -. DR PhylomeDB; P35280; -. DR Reactome; R-RNO-2565942; Regulation of PLK1 Activity at G2/M Transition. DR Reactome; R-RNO-5620912; Anchoring of the basal body to the plasma membrane. DR Reactome; R-RNO-5620916; VxPx cargo-targeting to cilium. DR Reactome; R-RNO-8854214; TBC/RABGAPs. DR Reactome; R-RNO-8873719; RAB geranylgeranylation. DR Reactome; R-RNO-8876198; RAB GEFs exchange GTP for GDP on RABs. DR PRO; PR:P35280; -. DR Proteomes; UP000002494; Chromosome 16. DR Bgee; ENSRNOG00000014621; Expressed in spleen and 20 other cell types or tissues. DR ExpressionAtlas; P35280; baseline and differential. DR GO; GO:0005814; C:centriole; IEA:UniProtKB-SubCell. DR GO; GO:0005813; C:centrosome; ISS:UniProtKB. DR GO; GO:0036064; C:ciliary basal body; ISS:UniProtKB. DR GO; GO:0097546; C:ciliary base; ISO:RGD. DR GO; GO:0060170; C:ciliary membrane; ISO:RGD. DR GO; GO:0005929; C:cilium; ISS:UniProtKB. DR GO; GO:0005737; C:cytoplasm; ISS:UniProtKB. DR GO; GO:0031410; C:cytoplasmic vesicle; IDA:UniProtKB. DR GO; GO:0030659; C:cytoplasmic vesicle membrane; TAS:Reactome. DR GO; GO:0030425; C:dendrite; IDA:RGD. DR GO; GO:0005768; C:endosome; IBA:GO_Central. DR GO; GO:0010008; C:endosome membrane; ISS:UniProtKB. DR GO; GO:0070382; C:exocytic vesicle; ISO:RGD. DR GO; GO:0098978; C:glutamatergic synapse; IDA:SynGO. DR GO; GO:0005794; C:Golgi apparatus; ISS:UniProtKB. DR GO; GO:0005764; C:lysosome; ISS:UniProtKB. DR GO; GO:0030496; C:midbody; ISS:UniProtKB. DR GO; GO:0043025; C:neuronal cell body; IDA:RGD. DR GO; GO:0097730; C:non-motile cilium; ISO:RGD. DR GO; GO:0045335; C:phagocytic vesicle; ISS:UniProtKB. DR GO; GO:0030670; C:phagocytic vesicle membrane; IEA:UniProtKB-SubCell. DR GO; GO:0005886; C:plasma membrane; ISS:UniProtKB. DR GO; GO:0055037; C:recycling endosome; ISO:RGD. DR GO; GO:0055038; C:recycling endosome membrane; ISS:UniProtKB. DR GO; GO:0045202; C:synapse; IDA:SynGO. DR GO; GO:0008021; C:synaptic vesicle; IBA:GO_Central. DR GO; GO:0030140; C:trans-Golgi network transport vesicle; ISO:RGD. DR GO; GO:0003925; F:G protein activity; ISS:UniProtKB. DR GO; GO:0019003; F:GDP binding; ISS:UniProtKB. DR GO; GO:0005525; F:GTP binding; ISS:UniProtKB. DR GO; GO:0003924; F:GTPase activity; ISS:UniProtKB. DR GO; GO:0031489; F:myosin V binding; ISO:RGD. DR GO; GO:0019901; F:protein kinase binding; IPI:RGD. DR GO; GO:1990782; F:protein tyrosine kinase binding; IPI:RGD. DR GO; GO:0007409; P:axonogenesis; IMP:UniProtKB. DR GO; GO:0032869; P:cellular response to insulin stimulus; IMP:UniProtKB. DR GO; GO:0060271; P:cilium assembly; ISS:UniProtKB. DR GO; GO:0032456; P:endocytic recycling; ISO:RGD. DR GO; GO:0006887; P:exocytosis; IBA:GO_Central. DR GO; GO:0042593; P:glucose homeostasis; IC:UniProtKB. DR GO; GO:0007030; P:Golgi organization; ISS:UniProtKB. DR GO; GO:0048210; P:Golgi vesicle fusion to target membrane; ISO:RGD. DR GO; GO:0098969; P:neurotransmitter receptor transport to postsynaptic membrane; IDA:SynGO. DR GO; GO:0098887; P:neurotransmitter receptor transport, endosome to postsynaptic membrane; IDA:SynGO. DR GO; GO:0046326; P:positive regulation of D-glucose import across plasma membrane; IC:UniProtKB. DR GO; GO:0061512; P:protein localization to cilium; ISS:UniProtKB. DR GO; GO:0072659; P:protein localization to plasma membrane; IDA:UniProtKB. DR GO; GO:0010506; P:regulation of autophagy; ISS:UniProtKB. DR GO; GO:0048169; P:regulation of long-term neuronal synaptic plasticity; IDA:RGD. DR GO; GO:0032880; P:regulation of protein localization; IMP:RGD. DR GO; GO:0051223; P:regulation of protein transport; IDA:RGD. DR GO; GO:0006904; P:vesicle docking involved in exocytosis; ISO:RGD. DR CDD; cd01867; Rab8_Rab10_Rab13_like; 1. DR FunFam; 3.40.50.300:FF:000202; ras-related protein Rab-8A; 1. DR Gene3D; 3.40.50.300; P-loop containing nucleotide triphosphate hydrolases; 1. DR InterPro; IPR027417; P-loop_NTPase. DR InterPro; IPR005225; Small_GTP-bd. DR InterPro; IPR001806; Small_GTPase. DR InterPro; IPR050305; Small_GTPase_Rab. DR NCBIfam; TIGR00231; small_GTP; 1. DR PANTHER; PTHR47980; LD44762P; 1. DR Pfam; PF00071; Ras; 1. DR PRINTS; PR00449; RASTRNSFRMNG. DR SMART; SM00177; ARF; 1. DR SMART; SM00175; RAB; 1. DR SMART; SM00176; RAN; 1. DR SMART; SM00173; RAS; 1. DR SMART; SM00174; RHO; 1. DR SUPFAM; SSF52540; P-loop containing nucleoside triphosphate hydrolases; 1. DR PROSITE; PS51419; RAB; 1. PE 1: Evidence at protein level; KW Autophagy; Cell membrane; Cell projection; Cilium; KW Cilium biogenesis/degradation; Cytoplasm; Cytoplasmic vesicle; KW Cytoskeleton; Endosome; Golgi apparatus; GTP-binding; Hydrolase; KW Lipoprotein; Lysosome; Magnesium; Membrane; Metal-binding; Methylation; KW Nucleotide-binding; Phosphoprotein; Prenylation; Protein transport; KW Reference proteome; Transport. FT CHAIN 1..204 FT /note="Ras-related protein Rab-8A" FT /id="PRO_0000121133" FT PROPEP 205..207 FT /note="Removed in mature form" FT /evidence="ECO:0000255" FT /id="PRO_0000370797" FT MOTIF 31..45 FT /note="Switch 1" FT /evidence="ECO:0000250|UniProtKB:P62820" FT MOTIF 63..80 FT /note="Switch 2" FT /evidence="ECO:0000250|UniProtKB:P62820" FT BINDING 17 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 18 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 19 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 20 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 21 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 22 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 22 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 23 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 35 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 39 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 40 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 40 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 63 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 66 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 121 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 122 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 124 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 152 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT BINDING 153 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000250|UniProtKB:P61006" FT MOD_RES 72 FT /note="Phosphothreonine" FT /evidence="ECO:0000250|UniProtKB:P61006" FT MOD_RES 181 FT /note="Phosphoserine" FT /evidence="ECO:0007744|PubMed:22673903" FT MOD_RES 185 FT /note="Phosphoserine" FT /evidence="ECO:0000250|UniProtKB:P61006" FT MOD_RES 204 FT /note="Cysteine methyl ester" FT /evidence="ECO:0000255" FT LIPID 204 FT /note="S-geranylgeranyl cysteine" FT /evidence="ECO:0000250" FT CONFLICT 102 FT /note="W -> S (in Ref. 2; AAA41997)" FT /evidence="ECO:0000305" FT CONFLICT 176..184 FT /note="KLEGNSPQG -> NWNPTTLR (in Ref. 2; AAA41997)" FT /evidence="ECO:0000305" FT CONFLICT 199 FT /note="T -> R (in Ref. 2; AAA41997)" FT /evidence="ECO:0000305" SQ SEQUENCE 207 AA; 23668 MW; AC89DC85588FB8F8 CRC64; MAKTYDYLFK LLLIGDSGVG KTCVLFRFSE DAFNSTFIST IGIDFKIRTI ELDGKRIKLQ IWDTAGQERF RTITTAYYRG AMGIMLVYDI TNEKSFDNIR NWIRNIEEHA SADVEKMILG NKCDVNDKRQ VSKERGEKLA LDYGIKFMET SAKANINVEN AFFTLARDIK AKMDKKLEGN SPQGSSHGVK ITVEQQKRTS FFRCSLL //