ID   MRGX2_TRAFR             Reviewed;         330 AA.
AC   Q4QXU4;
DT   20-DEC-2005, integrated into UniProtKB/Swiss-Prot.
DT   19-JUL-2005, sequence version 1.
DT   25-MAY-2022, entry version 51.
DE   RecName: Full=Mas-related G-protein coupled receptor member X2;
GN   Name=MRGPRX2; Synonyms=MRGX2;
OS   Trachypithecus francoisi (Francois' leaf monkey) (Presbytis francoisi).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini;
OC   Cercopithecidae; Colobinae; Trachypithecus.
OX   NCBI_TaxID=54180;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=15862286; DOI=10.1016/j.gene.2005.03.001;
RA   Yang S., Liu Y., Lin A.A., Cavalli-Sforza L.L., Zhao Z., Su B.;
RT   "Adaptive evolution of MRGX2, a human sensory neuron specific gene involved
RT   in nociception.";
RL   Gene 352:30-35(2005).
CC   -!- FUNCTION: Mast cell-specific receptor for basic secretagogues, i.e.
CC       cationic amphiphilic drugs, as well as endo- or exogenous peptides,
CC       consisting of a basic head group and a hydrophobic core. Recognizes and
CC       binds small molecules containing a cyclized tetrahydroisoquinoline
CC       (THIQ), such as non-steroidal neuromuscular blocking drugs (NMBDs),
CC       including tubocurarine and atracurium. In response to these compounds,
CC       mediates pseudo-allergic reactions characterized by histamine release,
CC       inflammation and airway contraction. {ECO:0000250|UniProtKB:Q3KNA1}.
CC   -!- SUBCELLULAR LOCATION: Cell membrane {ECO:0000255}; Multi-pass membrane
CC       protein {ECO:0000255}.
CC   -!- SIMILARITY: Belongs to the G-protein coupled receptor 1 family. Mas
CC       subfamily. {ECO:0000255|PROSITE-ProRule:PRU00521}.
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DR   EMBL; AY651164; AAW70077.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q4QXU4; -.
DR   SMR; Q4QXU4; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0004930; F:G protein-coupled receptor activity; ISS:UniProtKB.
DR   GO; GO:1990595; F:mast cell secretagogue receptor activity; ISS:UniProtKB.
DR   GO; GO:0045576; P:mast cell activation; ISS:UniProtKB.
DR   GO; GO:0043303; P:mast cell degranulation; ISS:UniProtKB.
DR   InterPro; IPR000276; GPCR_Rhodpsn.
DR   InterPro; IPR017452; GPCR_Rhodpsn_7TM.
DR   InterPro; IPR026234; MRGPCRFAMILY.
DR   PANTHER; PTHR11334; PTHR11334; 1.
DR   Pfam; PF00001; 7tm_1; 1.
DR   PRINTS; PR00237; GPCRRHODOPSN.
DR   PRINTS; PR02108; MRGPCRFAMILY.
DR   PROSITE; PS00237; G_PROTEIN_RECEP_F1_1; 1.
DR   PROSITE; PS50262; G_PROTEIN_RECEP_F1_2; 1.
PE   3: Inferred from homology;
KW   Cell membrane; G-protein coupled receptor; Membrane; Receptor; Transducer;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..330
FT                   /note="Mas-related G-protein coupled receptor member X2"
FT                   /id="PRO_0000069781"
FT   TOPO_DOM        1..33
FT                   /note="Extracellular"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        34..54
FT                   /note="Helical; Name=1"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        55..63
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        64..84
FT                   /note="Helical; Name=2"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        85..96
FT                   /note="Extracellular"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        97..117
FT                   /note="Helical; Name=3"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        118..144
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        145..165
FT                   /note="Helical; Name=4"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        166..184
FT                   /note="Extracellular"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        185..205
FT                   /note="Helical; Name=5"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        206..228
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        229..249
FT                   /note="Helical; Name=6"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        250..264
FT                   /note="Extracellular"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        265..285
FT                   /note="Helical; Name=7"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        286..330
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   330 AA;  37043 MW;  4EE8ADD391CE443A CRC64;
     MDPTTLVWGT ESTTMNGNDQ ALPLLCGKET LILVVLILFI ALVGLVGNAF VLWLLGFRMR
     RNAFSVYVLS LAGADFLFLC FPMINCLAYL INFFHSISIN FPSFFTTVMT CAYLAGLSML
     SAISTERCLS VLWPIWYRSR RPRHLSAVMC VLLWALSLLL SILEGKFCGF LFSDGDSGWC
     QTFDFITAAW LMFLFVVLCG SSLALLVRIL CGSRGLPLTR LYLTILLTVL IFLLCGLPFG
     IQWFLILWIW KNSDVLFCHI HPVSVVLSSF NSSANPIIYF FVGSFRKQWR LRQPVLKLAL
     QRALQDTAEV DHSEGCFSQG TLEMSGSSLV