The alpha subunit forms a tight, non-covalent heterodimeric complex with the proteolytically-released beta-subunit. Interaction, via the tandem repeat region, with domain 1 of ICAM1 is implicated in cell migration and metastases. Isoform 1 binds directly the SH2 domain of GRB2, and forms a MUC1/GRB2/SOS1 complex involved in RAS signaling. The cytoplasmic tail (MUC1CT) interacts with several proteins such as SRC, CTNNB1 and ERBs. Interaction with the SH2 domain of CSK decreases interaction with GSK3B. Interacts with CTNNB1/beta-catenin and JUP/gamma-catenin and promotes cell adhesion. Interaction with JUP/gamma-catenin is induced by heregulin. Binds PRKCD, ERBB2, ERBB3 and ERBB4. Heregulin (HRG) stimulates the interaction with ERBB2 and, to a much lesser extent, the interaction with ERBB3 and ERBB4. Interacts with P53 in response to DNA damage. Interacts with KLF4. Interacts with estrogen receptor alpha/ESR1, through its DNA-binding domain, and stimulates its transcription activity. Binds ADAM17.
Function:
The beta subunit contains a C-terminal domain which is involved in cell signaling, through phosphorylations and protein-protein interactions. Modulates signaling in ERK, SRC and NF-kappa-B pathways. In activated T-cells, influences directly or indirectly the Ras/MAPK pathway. Promotes tumor progression. Regulates TP53-mediated transcription and determines cell fate in the genotoxic stress response. Binds, together with KLF4, the PE21 promoter element of TP53 and represses TP53 activity.
Subcellular Location:
Mucin-1 subunit beta
Cell membrane
Cytoplasm
Nucleus
On EGF and PDGFRB stimulation, transported to the nucleus through interaction with CTNNB1, a process which is stimulated by phosphorylation. On HRG stimulation, colocalizes with JUP/gamma-catenin at the nucleus.
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS 6; Y AND 8);TISSUE SPECIFICITY
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS 6; E2; J13; M6; S2; T10; Y-LSP AND ZD);ALTERNATIVE SPLICING;VARIANT MET-1117
12.
"Cloning of a new potential secreted short variant form of MUC1 mucin in epithelial cancer cell line." Zhang L.X.
,
Li C.H.
,
Sun L.Y.
,
Yue W.
Submitted (2001-02) to the EMBL/GenBank/DDBJ databases
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 9)
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM Y);VARIANT MET-1117
"Cloning of a new MUC1 short variant mRNA F from HeLa cells." Zhang L.X.
,
Lu H.J.
Submitted (2003-06) to the EMBL/GenBank/DDBJ databases
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM F)
15.
"Cloning of a new MUC1 short variant mRNA S2 from HeLa cells." Zhang L.X.
,
Lu H.J.
Submitted (2003-06) to the EMBL/GenBank/DDBJ databases
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM S2)
16.
"Isolation of MUC1 isoforms from MCF7 cells." Zhang L.
,
Finn O.J.
Submitted (2007-06) to the EMBL/GenBank/DDBJ databases
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM M6)
17.
NIEHS SNPs program
Submitted (2003-11) to the EMBL/GenBank/DDBJ databases
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Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA];VARIANTS MET-1117 AND ASN-1142
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Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS Y AND Y-LSP)
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 1-160 (ISOFORM 2)
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 1-109 (ISOFORM 2)
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Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 1-46 (ISOFORMS 3 AND 4)
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Cited for: PROTEIN SEQUENCE OF 24-33; 28-37 AND 1098-1107;PROTEOLYTIC PROCESSING
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Cited for: PROTEIN SEQUENCE OF 1098-1111;PROTEOLYTIC CLEAVAGE;MUTAGENESIS OF SER-1098
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Cited for: PROTEIN SEQUENCE OF TANDEM REPEAT;IDENTIFICATION BY MASS SPECTROMETRY;GLYCOSYLATION
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Cited for: IDENTIFICATION IN A COMPLEX WITH SOS1 AND GRB2;INTERACTION WITH GRB2 AND SOS1;PHOSPHORYLATION
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Cited for: GLYCOSYLATION AT THR-131 AND THR-139;IDENTIFICATION BY MASS SPECTROMETRY
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Cited for: GLYCOSYLATION AT THR-131 AND THR-139;IDENTIFICATION BY MASS SPECTROMETRY
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Cited for: INTERACTION WITH GSK3B AND CTNNB1;PHOSPHORYLATION AT SER-1227;MUTAGENESIS OF SER-1223 AND SER-1227
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Cited for: CHARACTERIZATION (ISOFORM Y);MUTAGENESIS OF ASP-1116
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Cited for: INTERACTION WITH SRC; GSK3B AND CTNNB1;PHOSPHORYLATION AT TYR-1229;MUTAGENESIS OF TYR-1229
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Cited for: INTERACTION WITH EGFR;PHOSPHORYLATION AT TYR-1229 BY EGFR;MUTAGENESIS OF TYR-1191; TYR-1203; TYR-1209; TYR-1218 AND TYR-1229
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Cited for: PHOSPHORYLATION AT THR-1224;INTERACTION WITH PRKCD;FUNCTION;MUTAGENESIS OF SER-1223; THR-1224 AND SER-1227
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Cited for: PHOSPHORYLATION AT TYR-1203; TYR-1212; TYR-1229 AND TYR-1243
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Cited for: INTERACTION WITH CTNNB1;FUNCTION;MUTAGENESIS OF TYR-1229
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Cited for: INTERACTION WITH ERBB2; ERBB3 AND ERBB4;SUBCELLULAR LOCATION;MUTAGENESIS OF 1187-ARG--LYS-1189
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Cited for: INTERACTION WITH AP1S2 AND GRB2;SUBCELLULAR LOCATION;MUTAGENESIS OF TYR-1191; TYR-1203; TYR-1229 AND TYR-1243
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Cited for: INTERACTION WITH GSK3B;PHOSPHORYLATION;FUNCTION
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Cited for: STRUCTURE OF CARBOHYDRATES;IDENTIFICATION BY MASS SPECTROMETRY;SUBCELLULAR LOCATION
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Cited for: INTERACTION WITH LCK;PHOSPHORYLATION;FUNCTION;TISSUE SPECIFICITY
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Cited for: PALMITOYLATION AT CYS-1184 AND CYS-1186;SUBCELLULAR LOCATION;INTERACTION WITH AP1S1 AND AP1S2;MUTAGENESIS OF CYS-1184; CYS-1186; TYR-1203 AND 1187-ARG--LYS-1189
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Cited for: INTERACTION WITH CTNNB1;SUBCELLULAR LOCATION;FUNCTION
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Cited for: PHOSPHORYLATION AT TYR-1203; TYR-1218 AND TYR-1229;MUTAGENESIS OF TYR-1203 AND TYR-1218;SUBCELLULAR LOCATION;IDENTIFICATION BY MASS SPECTROMETRY
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Cited for: STRUCTURE BY NMR OF 1041-1097 AND 1098-1152 OF WILD TYPE AND MUTANT ALA-1098;IDENTIFICATION BY MASS SPECTROMETRY;STRUCTURE OF CARBOHYDRATES;AUTOCATALYTIC CLEAVAGE