CXB2_PONPY
ID CXB2_PONPY Reviewed; 226 AA.
AC Q8MIT9;
DT 19-SEP-2003, integrated into UniProtKB/Swiss-Prot.
DT 01-OCT-2002, sequence version 1.
DT 03-AUG-2022, entry version 72.
DE RecName: Full=Gap junction beta-2 protein;
DE AltName: Full=Connexin-26;
DE Short=Cx26;
GN Name=GJB2;
OS Pongo pygmaeus (Bornean orangutan).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae;
OC Pongo.
OX NCBI_TaxID=9600;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA Orten D.J., Bizzarri-Kriener C., Askew J.W., Li J.-L., Louis E.,
RA Kelley P.M., Kimberling W.J.;
RT "Sequence comparison of primate connexin 26 (GJB2) genes.";
RL Submitted (JUL-2001) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Structural component of gap junctions. Gap junctions are
CC dodecameric channels that connect the cytoplasm of adjoining cells.
CC They are formed by the docking of two hexameric hemichannels, one from
CC each cell membrane. Small molecules and ions diffuse from one cell to a
CC neighboring cell via the central pore. {ECO:0000250|UniProtKB:P29033}.
CC -!- SUBUNIT: A hemichannel or connexon is composed of a hexamer of
CC connexins. A functional gap junction is formed by the apposition of two
CC hemichannels (By similarity). Forms heteromeric channels with GJB4.
CC Interacts with CNST (By similarity). {ECO:0000250|UniProtKB:P29033,
CC ECO:0000250|UniProtKB:Q00977}.
CC -!- SUBCELLULAR LOCATION: Cell membrane {ECO:0000250|UniProtKB:Q00977};
CC Multi-pass membrane protein {ECO:0000250|UniProtKB:P29033}. Cell
CC junction, gap junction {ECO:0000250|UniProtKB:Q00977}. Note=Colocalizes
CC with GJB4 at gap junction plaques in the cochlea.
CC {ECO:0000250|UniProtKB:Q00977}.
CC -!- SIMILARITY: Belongs to the connexin family. Beta-type (group I)
CC subfamily. {ECO:0000305}.
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DR EMBL; AY046582; AAL03974.1; -; Genomic_DNA.
DR AlphaFoldDB; Q8MIT9; -.
DR SMR; Q8MIT9; -.
DR GO; GO:0005922; C:connexin complex; ISS:UniProtKB.
DR GO; GO:0005887; C:integral component of plasma membrane; ISS:UniProtKB.
DR GO; GO:0005509; F:calcium ion binding; ISS:UniProtKB.
DR GO; GO:0005243; F:gap junction channel activity; ISS:UniProtKB.
DR GO; GO:0007267; P:cell-cell signaling; ISS:UniProtKB.
DR GO; GO:1990349; P:gap junction-mediated intercellular transport; ISS:UniProtKB.
DR GO; GO:0007605; P:sensory perception of sound; IEA:UniProtKB-KW.
DR Gene3D; 1.20.1440.80; -; 1.
DR InterPro; IPR000500; Connexin.
DR InterPro; IPR002268; Connexin26.
DR InterPro; IPR019570; Connexin_CCC.
DR InterPro; IPR017990; Connexin_CS.
DR InterPro; IPR013092; Connexin_N.
DR InterPro; IPR038359; Connexin_N_sf.
DR PANTHER; PTHR11984; PTHR11984; 1.
DR Pfam; PF00029; Connexin; 1.
DR PRINTS; PR00206; CONNEXIN.
DR PRINTS; PR01139; CONNEXINB2.
DR SMART; SM00037; CNX; 1.
DR SMART; SM01089; Connexin_CCC; 1.
DR PROSITE; PS00407; CONNEXINS_1; 1.
DR PROSITE; PS00408; CONNEXINS_2; 1.
PE 3: Inferred from homology;
KW Calcium; Cell junction; Cell membrane; Disulfide bond; Gap junction;
KW Hearing; Membrane; Metal-binding; Transmembrane; Transmembrane helix.
FT CHAIN 1..226
FT /note="Gap junction beta-2 protein"
FT /id="PRO_0000057859"
FT INTRAMEM 2..13
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT TOPO_DOM 14..20
FT /note="Cytoplasmic"
FT /evidence="ECO:0000305"
FT TRANSMEM 21..40
FT /note="Helical"
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT TOPO_DOM 41..73
FT /note="Extracellular"
FT /evidence="ECO:0000305"
FT TRANSMEM 74..94
FT /note="Helical"
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT TOPO_DOM 95..135
FT /note="Cytoplasmic"
FT /evidence="ECO:0000305"
FT TRANSMEM 136..156
FT /note="Helical"
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT TOPO_DOM 157..189
FT /note="Extracellular"
FT /evidence="ECO:0000305"
FT TRANSMEM 190..210
FT /note="Helical"
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT TOPO_DOM 211..226
FT /note="Cytoplasmic"
FT /evidence="ECO:0000305"
FT BINDING 42
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /ligand_note="ligand shared between two neighboring
FT subunits"
FT /note="in other chain"
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT BINDING 45
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /ligand_note="ligand shared between two neighboring
FT subunits"
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT BINDING 47
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /ligand_note="ligand shared between two neighboring
FT subunits"
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT DISULFID 53..180
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT DISULFID 60..174
FT /evidence="ECO:0000250|UniProtKB:P29033"
FT DISULFID 64..169
FT /evidence="ECO:0000250|UniProtKB:P29033"
SQ SEQUENCE 226 AA; 26213 MW; 6EF559BAD3A6883A CRC64;
MDWGALQTIL GGVNKHSTSI GKIWLTVLFI FRIMILVVAA KEVWGDEQAD FVCNTLQPGC
KNVCYDHYFP ISHIRLWALQ LIFVSTPALL VAMHVAYRRH EKKRKFIKGE IKSEFKDIEE
IKTQKVRIEG SLWWTYTSSI FFRVIFEAAF MYVFYVMYDG FSMQRLVKCN AWPCPNTVDC
FVSRPTEKTV FTVFMIAVSG ICILLNVTEL CYLLIRYCSG RSKKPV
