The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
Identity and principal function. The specified human gene RAB3IP encodes Rabin8, a SEC2-family guanine-nucleotide exchange factor (GEF). Rabin8 promotes release of GDP from a Rab GTPase so that GTP can bind; its best-established substrate is Rab8, particularly Rab8A. This is a protein-activation reaction, not transport of a molecular substrate across a membrane. The name Rab-3A-interacting protein records a historical interaction, not established GEF activity toward Rab3A. Nor should RAB3IP be confused with the related Rab8 GEF GRAB, encoded by RAB3IL1. The Q96QF0 accession and the additional names Rabin-3 and SSX2-interacting protein are supplied by the specified UniProt identity; the functional assignments below concern RAB3IP/Rabin8, not GRAB. (ishida2016multipletypesof pages 8-9, tong2021guaninenucleotideexchange pages 1-3, homma2016rabin8regulatesneurite pages 9-13)
Rabin8’s conserved Sec2/GEF coiled-coil region mediates nucleotide exchange. Biochemical experiments place a Rab8 exchange-active region around residues 144–245; the adjacent region around 262–331 contributes to binding its upstream regulator, active Rab11. Rab11-GTP binds Rabin8 and increases Rabin8-catalyzed GDP release from Rab8, establishing a Rab11 → Rabin8 → Rab8 activation cascade. The Rab11-binding function is distinct from Rabin8’s action on Rab8: Rab11 is an upstream recruiting and regulatory GTPase, whereas Rab8 is the exchange substrate. (knodler2010coordinationofrab8 pages 2-3, knodler2010coordinationofrab8 pages 1-2)
Substrate specificity needs a qualification. Earlier purified-protein assays supported exchange on Rab8A and Rab8B, but not Rab3A or Rab10. A subsequent mammalian-cell study detected Rabin8-dependent GTP loading of Rab8A and Rab10; Rab10 activation persisted after Rab8 depletion, and a naturally occurring Rabin8 isoform missing 32 residues of its Sec2 region failed to activate either protein. Thus Rab8 is the strongest-established substrate, Rab10 is supported in a cellular context, and the difference between in-vitro and cellular Rab10 results is unresolved. Rab3A binding should not be interpreted as proof that Rab3A is an exchange substrate. (homma2016rabin8regulatesneurite pages 9-13, homma2016rabin8regulatesneurite pages 5-9)
Structural and binding studies further show how Rabin8 can act as a Rab11 effector as well as a GEF: its C-terminal portion contacts a noncanonical Rab11 surface adjacent to the site used by the Rab11 effector FIP3, permitting a Rab11–FIP3–Rabin8 assembly. Isolated Rabin8 binds GTP-analogue-loaded Rab11 relatively weakly, with a reported dissociation constant of approximately 40 μM; FIP3 association strengthens Rabin8 binding approximately four- to fivefold. These observations support coordinated recruitment, rather than identifying FIP3 as an exchange substrate. (vetter2015noveltopographyof pages 5-9, vetter2015noveltopographyof pages 9-12)
The following evidence map separates Rabin8’s direct biochemical activity from context-dependent cellular functions:
| Functional context | Direct mechanistic finding | Experimental system/evidence | Primary publication DOI/year |
|---|---|---|---|
| Protein identity and substrate specificity | Human RAB3IP/Rabin8 is a SEC2-family GEF distinct from GRAB/RAB3IL1. Purified-protein assays supported exchange activity toward Rab8A/B, but not Rab3A or Rab10. Mammalian-cell assays found activation of Rab8A and Rab10; deleting 32 residues from the SEC2/GEF domain abolished both activities. Rab10 specificity is therefore context-dependent, while Rab3A is a historical binding partner rather than an established exchange substrate. (homma2016rabin8regulatesneurite pages 9-13, homma2016rabin8regulatesneurite pages 5-9) | In-vitro nucleotide-exchange assays; GTP-bound Rab pull-downs, Rab8 depletion, and SEC2-domain deletion in PC12 cells. | 10.1091/mbc.e16-02-0091, 2016 |
| Rab11-dependent ciliogenesis | GTP-bound Rab11 binds Rabin8 and stimulates Rabin8-catalyzed GDP release from Rab8. Rab5A and Rab3A controls did not stimulate the reaction. Rab11 inhibition or depletion impaired ciliogenesis, supporting a Rab11→Rabin8→Rab8 cascade. Rabin8 residues 262–331 mediate Rab11 binding; its GEF region lies at approximately residues 144–245. (knodler2010coordinationofrab8 pages 2-3, knodler2010coordinationofrab8 pages 1-2) | Recombinant binding and GDP-release assays; active and inactive Rab11 mutants; RNA interference and dominant-negative perturbation in cultured cells. | 10.1073/pnas.1002401107, 2010 |
| CENTLEIN interaction and Rabin8 timing | CENTLEIN directly binds Rabin8 through Rabin8 residues 200–230. CENTLEIN knockout reduced RPE1 ciliation from 67.46% to 20.49%, an absolute decrease of 46.97 percentage points. At 12 hours after serum withdrawal, pericentrosomal GFP-Rabin8 increased from 26.42% in wild-type cells to 63.66% in knockout cells. Full-length CENTLEIN, but not a Rabin8-binding-deficient mutant, rescued ciliation; Rab8A-Q67L partially rescued it to 41.63%. No cilia-density difference occurred in E10.5 ventral neural tube, indicating context dependence. (li2023adirectinteraction pages 1-2, li2023adirectinteraction pages 3-5, li2023adirectinteraction pages 5-9) | GST pull-down and reciprocal co-immunoprecipitation; CRISPR knockout and rescue in hTERT-RPE1 cells; serum-starvation time course; mouse embryonic fibroblasts and embryonic neural tube. | 10.3724/abbs.2023064, 2023 |
| GDP-Rab8 proteostasis | Rabin8 depletion increases the GDP-bound fraction of wild-type Rab8A, its association with UBQLN4 and RNF126, and its polyubiquitination. BAG6 recognizes inactive Rab8-family proteins, RNF126 promotes ubiquitination, and UBQLN4 supports proteasomal delivery. This pathway limits inactive Rab8/Rab10 accumulation and supports ciliogenesis. (takahashi2023proteinqualitycontrol pages 5-8, takahashi2023proteinqualitycontrol pages 8-10, takahashi2023proteinqualitycontrol pages 10-12) | Rabin8 and quality-control-factor depletion; GDP-locked Rab8A-T22N and GTP-locked Rab8A-Q67L comparisons; co-precipitation, ubiquitination, degradation, and RPE1 ciliation assays. | 10.1016/j.isci.2023.106652, 2023 |
| EGF–ERK regulation | EGF-activated ERK1/2 directly phosphorylates Rabin8 at S16, S19, S247, and S250, relieving C-terminal autoinhibition and increasing Rab8-directed GEF activity. Phosphorylation weakens Rab11 binding and is required for efficient transferrin recycling to the plasma membrane. (wang2015activationofrab8 pages 4-5, wang2015activationofrab8 pages 1-2, wang2015activationofrab8 pages 3-3) | Recombinant ERK2 kinase assays, phosphopeptide mapping, intramolecular BRET, GEF assays, phosphomutants, and transferrin-recycling experiments. | 10.1073/pnas.1412089112, 2015 |
| Macrophage TLR4/LPS pathway | LPS induces Rabin8–Rab8A binding and colocalization at surface ruffles and macropinosomes. Rabin8 and the separate GEF GRAB/RAB3IL1 both contribute to Rab8A GTP loading but are partly redundant: either can support Rab8A–PI3Kγ-dependent Akt/mTOR signaling. Deletion affects nucleotide activation rather than Rab8A membrane recruitment or macropinosome formation. (tong2021guaninenucleotideexchange pages 1-3, tong2021guaninenucleotideexchange pages 14-16) | LPS-stimulated macrophages; co-immunoprecipitation, fluorescence microscopy, Rab8A activation assays, CRISPR single- and double-knockout lines, and live-cell Akt-probe imaging. | 10.1080/21541248.2019.1587278, online 2019; issue 2021 |
| Evidence boundary | These findings establish biochemical and cellular functions but do not provide clinical validation, an approved therapeutic application, or proof of a human RAB3IP disorder. The 2024 exocyst–Gli study did not directly test Rabin8 and cannot establish RAB3IP involvement. (niedziołka2024theexocystcomplex pages 1-2, niedziołka2024theexocystcomplex pages 9-10) | Evidence derives mainly from purified proteins, immortalized cell lines, macrophages, PC12 cells, and selected mouse tissues; no clinical studies are represented. | 10.1038/s42003-024-05817-2, 2024 |
Table: Concise evidence map for human RAB3IP/Rabin8, distinguishing it from GRAB/RAB3IL1 and separating direct biochemical findings from context-dependent cellular results. No clinical validation is implied.
Rabin8 is an intracellular, dynamically recruited trafficking regulator, not an extracellular protein. Its principal functional locations are Rab11-positive recycling-endosome and post-Golgi trafficking compartments, vesicles approaching the centrosome/mother centriole, and the pericentrosomal or ciliary-base region during primary-cilium assembly. Rab11 binding helps determine this distribution: Rab11-binding-deficient Rabin8 mutants dispersed into the cytoplasm rather than localizing to Rab11-positive recycling endosomes in a neuronal-cell model. Rabin8 can also associate with Arf6/Rab8-positive recycling endosomes after nerve-growth-factor stimulation. These are condition- and cell-type-dependent localizations, not evidence that all Rabin8 is constitutively resident inside mature cilia. (ishida2016multipletypesof pages 8-9, li2023adirectinteraction pages 1-2, homma2016rabin8regulatesneurite pages 9-13)
In hTERT-RPE1 cells, serum withdrawal brings GFP-tagged Rabin8 to the centrosomal vicinity early in ciliogenesis; its pericentrosomal accumulation normally subsides as ciliation proceeds. In LPS-stimulated macrophages, Rabin8 instead appears with Rab8A at surface ruffles and early macropinosomes, where the relevant activity is Rab8A nucleotide loading during inflammatory signaling. These experimentally observed compartments explain why a single static localization label would be incomplete. (tong2021guaninenucleotideexchange pages 1-3, li2023adirectinteraction pages 3-5)
Primary-cilium membrane assembly. The strongest-established physiological placement is the early trafficking cascade in which Rab11-associated vesicles bring Rabin8 toward the mother centriole, Rabin8 activates Rab8, and Rab8 supports growth and delivery of the ciliary membrane. Rabin8 also associates with the BBSome component BBS1; activated Rab11 increases the Rabin8–BBS1 association in binding experiments. Work on ciliary receptor trafficking positions Rabin8 alongside FIP3 and ASAP1 in a Rab11-linked targeting complex, while a photoreceptor study found interaction of Rabin8 with the SNARE domain of VAMP7 on the rhodopsin-delivery route. These interactions help position an exchange factor within carrier-targeting and membrane-fusion machinery; they do not establish Rabin8 itself as a SNARE or a structural component of the ciliary axoneme. (knodler2010coordinationofrab8 pages 4-4, knodler2010coordinationofrab8 pages 4-5, wang2015thearfand pages 1-4, kandachar2018aninteractionnetwork pages 1-4)
Regulated recycling to the cell surface. Rabin8 connects extracellular EGF signaling to trafficking: ERK1/2 directly phosphorylates Rabin8 at S16, S19, S247 and S250. Biochemical and conformational assays support relief of Rabin8 autoinhibition and increased Rab8-directed GEF activity; blocking this phosphorylation impairs transferrin recycling to the plasma membrane. A distinct serum LPA–LPAR1–PI3K/Akt mechanism limits ciliogenesis: Akt promotes Rab11 binding to the competing effector WDR44, opposing Rab11–FIP3–Rabin8 preciliary trafficking, while Akt-dependent Rabin8 phosphorylation near its exchange domain affects Rab8-directed activity. These are context-specific regulatory inputs, not interchangeable universal activation mechanisms. (walia2019aktregulatesa pages 1-3, wang2015activationofrab8 pages 4-5, wang2015activationofrab8 pages 1-2, walia2019aktregulatesa pages 10-12)
Other experimentally investigated settings. In NGF-stimulated PC12 cells, Rabin8 supports neurite outgrowth through Rab11-dependent trafficking involving Rab8 and Rab10. A GEF-deficient Rabin8 isoform still promoted some outgrowth, indicating an additional function that cannot simply be equated with Rab8 exchange. In macrophages, single- and double-gene knockout experiments show that Rabin8 and GRAB/RAB3IL1 contribute, partly redundantly, to LPS/TLR4-induced Rab8A-GTP loading. This supports Rab8A-dependent recruitment of PI3Kγ and Akt/mTOR signaling at macropinosomes; loss of the GEFs affected activation rather than Rab8A membrane recruitment or macropinosome formation. These are experimentally demonstrated cellular roles, not established therapeutic applications. (tong2021guaninenucleotideexchange pages 1-3, tong2021guaninenucleotideexchange pages 14-16, homma2016rabin8regulatesneurite pages 9-13)
CENTLEIN controls the timing of Rabin8 recruitment (2023). Li and colleagues mapped a CENTLEIN-interacting segment to Rabin8 residues 200–230, within its GEF region. In serum-starved RPE1 cultures, 67.46% ± 1.32% of control cells versus 20.49% ± 0.91% of CENTLEIN-knockout cells carried cilia: a 46.97-percentage-point difference, not a 47% relative decrease. At 12 hours, cells retaining pericentrosomal GFP-Rabin8 rose from 26.42% ± 0.83% in controls to 63.66% ± 2.70% after CENTLEIN loss. Re-expression of full-length CENTLEIN rescued ciliation more effectively than a mutant missing its Rabin8-binding region; active Rab8A-Q67L gave a partial rescue (41.63% ± 2.22%, versus 23.65% ± 0.84% with wild-type Rab8A in the compared CENTLEIN-null groups). Each quantified cell-culture condition in the reported figure used three experiments with more than 200 cells per experiment. The cropped Figure 5 panels corroborate the localization and rescue measurements. Importantly, E10.5 mouse ventral neural tubes showed no detectable cilia-density difference between Centlein-null and control embryos, so the culture phenotype should not be generalized to every tissue. [Li et al., Acta Biochimica et Biophysica Sinica, online 20 July 2023; https://doi.org/10.3724/abbs.2023064.] (li2023adirectinteraction pages 1-2, li2023adirectinteraction pages 3-5, li2023adirectinteraction pages 5-9, li2023adirectinteraction media d70786be)
Inactive Rab8 quality control complements exchange (2023). Takahashi and colleagues found that Rabin8 depletion increased association and ubiquitination of a GDP-bound fraction of Rab8A. Their experiments implicate BAG6, RNF126 and UBQLN4 in recognizing, ubiquitinating and disposing of inactive Rab8-family proteins. In a serum-starved RPE1 assay, ciliation was observed in 255/1,082 control cells (23.6%), versus 21/344 BAG6-depleted cells (6.1%) and 37/522 UBQLN4-depleted cells (7.1%); RNF126 depletion shortened mean measured cilium length from 2.3 to 1.6 μm in the reported comparison. These are effects of quality-control-factor perturbations, not ciliation percentages measured after RAB3IP knockout. The study adds a proteostasis consequence to the Rabin8–Rab8 activation model without showing that Rabin8 itself ubiquitinates Rab8. [Takahashi et al., iScience, 19 May 2023; https://doi.org/10.1016/j.isci.2023.106652.] (takahashi2023proteinqualitycontrol pages 5-8, takahashi2023proteinqualitycontrol pages 8-10, takahashi2023proteinqualitycontrol pages 10-12)
Boundary of a relevant 2024 development. A 2024 study demonstrated exocyst- and vesicle-associated delivery of soluble proteins including Gli2/Gli3 to cilia and investigated other trafficking GTPases. Its reported experiments do not directly establish RAB3IP/Rabin8 involvement in that soluble-cargo pathway. It should therefore not be cited as direct evidence that Rabin8 transports Gli or activates Hedgehog signaling. [Niedziółka et al., Communications Biology, 2024; https://doi.org/10.1038/s42003-024-05817-2.] (niedziołka2024theexocystcomplex pages 1-2, niedziołka2024theexocystcomplex pages 9-10)
Best-supported annotation: RAB3IP/Rabin8 is a Sec2-family Rab8 GEF and Rab11 effector that spatially couples upstream Rab11-positive trafficking to activation of Rab8 on polarized membrane-delivery routes, prominently at the developing primary cilium; Rab10 activation and Rab11-dependent non-GEF activity have also been observed in particular cellular settings. Its established uses in the cited research are as a mechanistic target in ciliogenesis, polarized recycling, neuronal-cell trafficking and macrophage signaling assays. Ciliary defects are relevant to ciliopathy biology, but the studies reviewed here do not establish a specific pathogenic human RAB3IP allele, a RAB3IP-directed clinical treatment, or clinical efficacy of targeting this GEF. Differences between purified-protein and cellular substrate assays, and between cultured-cell and embryonic-tissue ciliation outcomes, remain important limits on extrapolation. (homma2016rabin8regulatesneurite pages 9-13, tong2021guaninenucleotideexchange pages 1-3, li2023adirectinteraction pages 5-9, blacque2018rabgtpasesin pages 3-4)
Principal mechanistic sources: Knödler et al., PNAS (2010), https://doi.org/10.1073/pnas.1002401107; Wang et al., PNAS (2015), https://doi.org/10.1073/pnas.1412089112; Homma and Fukuda, Molecular Biology of the Cell (2016), https://doi.org/10.1091/mbc.e16-02-0091; Walia et al., Developmental Cell (2019), https://doi.org/10.1016/j.devcel.2019.05.022; and Tong et al., Small GTPases (online 2019; journal issue 2021), https://doi.org/10.1080/21541248.2019.1587278. (knodler2010coordinationofrab8 pages 1-2, tong2021guaninenucleotideexchange pages 1-3, walia2019aktregulatesa pages 1-3, wang2015activationofrab8 pages 1-2, homma2016rabin8regulatesneurite pages 9-13)
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