Protein: Protein scribble homolog (Scribble) (Protein LAP4) (Q80U72)
Organism: Mus musculus (Mouse)
Function: Scaffold protein involved in different aspects of polarized cell differentiation regulating epithelial and neuronal morphogenesis and T-cell polarization. Via its interaction with CRTAM, required for the late phase polarization of a subset of CD4+ T-cells, which in turn regulates TCR-mediated proliferation and IFNG and IL22 production. Most probably functions in the establishment of apico-basal cell polarity. May function in cell proliferation regulating progression from G1 to S phase and as a positive regulator of apoptosis for instance during acinar morphogenesis of the mammary epithelium. May also function in cell migration and adhesion and hence regulate cell invasion through MAPK signaling. May play a role in exocytosis and in the targeting of synaptic vesicles to synapses. Functions as an activator of Rac GTPase activity.
Subcellular location: Cell membrane {ECO:0000269|PubMed:18329370}; Peripheral membrane protein {ECO:0000269|PubMed:18329370}. Cell junction {ECO:0000250|UniProtKB:Q14160}. Cell junction, adherens junction {ECO:0000250|UniProtKB:Q14160}. Cell projection, lamellipodium {ECO:0000250|UniProtKB:Q14160}. Cytoplasm {ECO:0000250|UniProtKB:Q14160}. Postsynapse {ECO:0000250|UniProtKB:Q14160}. Presynapse {ECO:0000250|UniProtKB:Q14160}. Note=Targeting to cell-cell junctions which is CDH1-dependent is required for the pro-apoptotic activity (By similarity). In a subset of CD4+ T-cells, colocalizes with CRTAM at the immunological synapse during the late phase of T-cell activation (PubMed:18329370). Localized to small puncta throughout the cytoplasm and cell membrane when in the presence of SNAIL1 (By similarity). Localized along the length of perinuclear emanating vimentin bundles and at vimentin-positive fibrils at the cell periphery (By similarity). Localized to the lateral plasma membrane during the establishment and maturation of cell-cell contacts (By similarity). {ECO:0000250|UniProtKB:A0A8P0N4K0, ECO:0000250|UniProtKB:Q14160, ECO:0000269|PubMed:18329370}.
Interaction partners:
- Cell division control protein 42 homolog
- RAC-alpha serine/threonine-protein kinase
- Vang-like protein 2
- Rho guanine nucleotide exchange factor 7
- Lethal
- LLGL scribble cell polarity complex component 2
- Catenin beta-1
- Cadherin-1
- Ubiquitin-protein ligase E3A
- Disks large homolog 4
Sequence:
MLKCIPLWRCNRHVESVDKRHCSLQVVPEEIYRYSRSLEELLLDANQLRELPKPFFRLLNLRKLGLSDNEIQRLPPEVANFMQLVELDVSRNDIPEIPESIKFCKALEIADFSGNPLSRLPDGFTQLRSLAHLALNDVSLQALPGDVGNLANLVTLELRENLLKSLPASLSFLVKLEQLDLGGNDLEVLPDTLGALPNLRELWLDRNQLSALPPELGNLRRLVCLDVSENRLEELPVELGGLALLTDLLLSQNLLQRLPEGIGQLKQLSILKVDQNRLCEVTEAIGDCENLSELILTENLLTALPHSLGKLTKLTNLNVDRNHLEVLPPEIGGCVALSVLSLRDNRLAVLPPELAHTAELHVLDVAGNRLRSLPFALTHLNLKALWLAENQAQPMLRFQTEDDAQTGEKVLTCYLLPQQPLPSLEDAGQQSSPSESCSDAPLSRVSVIQFEDTLEGEEDAEEAAAEKRGLQRRATPHPSELKVMKRGIEERRNEAFVCKPDPSPPSPSEEEKRLSAESALSGGSVPSASTASEGEPEILPAEVQGLGQHEAMPAQEEYTEDDYNEPTVHFAEDTLIPREDGESEEGQPEAAWPLPSGRQRLIRKDTPHYKKHFKISKLPQPEAVVALLQGVQTDREGPTAGWHNGPHTPWAPRAHEEEEEEEEENRDEEEGEATTEEDDKEEAVASAPSVKGVSFDQANNLLIEPARIEEEELTLTIVRQTGGLGISIAGGKGSTPYKGDDEGIFISRVSEEGPAARAGVRVGDKLLEVNGVALQDAEHHEAVEALRGAGAAVQMRVWRERMVEPENAVTITPLRPEDDYSPREWRGGGLRLPLLQPETPVSLRQRHAACLVRSEKGLGFSIAGGKGSTPYRAGDGGIFISRIAEGGAAHRAGTLQVGDRVLSINGVDMTEARHDHAVSLLTAASPTISLLLERETGGTYPPSPPPHSSPTPAATVAATVSTAVPGEPLLPRLSPSLLATALEGPYPVEEICLPRAGGPLGLSIVGGSDHSSHPFGVQDPGVFISKVLPRGLAARCGLRVGDRILAVNGQDVREATHQEAVSALLRPCLELCLLVRRDPPPPGMRELCIQKAPGEKLGISIRGGAKGHAGNPCDPTDEGIFISKVSPTGAAGRDGRLRVGLRLLEVNQQSLLGLTHAEAVQLLRSVGDTLTVLVCDGFDTSTTTALEVSPGVIANPFAAGLGHRNSLESISSIDRELSPEGPGKEKELASQALPWESESAETTGRNLEPLKLDYRALAALPSAGSLQRGPSATTGGKTTEAPCSPGSQQTKPGVIQPLAQAWPRNSPAPRGRGGPCSPPSPDELPANVKQAYRAFAAVPTVHPPENSATQPPTPGPAASPEQLSFRERQKYFELEVRVPQAEGPPKRVSLVGADDLRKMQEEEARKLQQKRAQMLREEAVTSGPDMGLASDRESPDDQQEAEQPWAVPSHAGGSSPSSPPPLGGNAPVRTAKAERRHQERLRMQSPELPAPERALSPAERRALEAEKRALWRAARMKSLEQDALRAQMVLSKSQEGRGKRGPLERLAEAPSPAPTPSPTPLEDFGLQTSASPGRLPLSGKKFDYRAFAALPSSRPVYDIQSPDFVEELRTLEASPSPGSQEEDGEVALVLLGRPSPGAVGPEDMTLCSSRRSVRPGRRGLGPVPS