ID   B2MG_MUSSP              Reviewed;          92 AA.
AC   Q04714;
DT   01-OCT-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1996, sequence version 1.
DT   03-AUG-2022, entry version 98.
DE   RecName: Full=Beta-2-microglobulin;
DE   Flags: Fragment;
GN   Name=B2m;
OS   Mus spretus (Western Mediterranean mouse) (Algerian mouse).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Euarchontoglires; Glires; Rodentia; Myomorpha; Muroidea; Muridae;
OC   Murinae; Mus; Mus.
OX   NCBI_TaxID=10096;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=SEI, SET, Spain.PT., and STF; TISSUE=Liver;
RX   PubMed=8482575; DOI=10.1007/bf00190898;
RA   Hermel E., Robinson P.J., She J.-X., Lindahl K.F.;
RT   "Sequence divergence of B2m alleles of wild Mus musculus and Mus spretus
RT   implies positive selection.";
RL   Immunogenetics 38:106-116(1993).
CC   -!- FUNCTION: Component of the class I major histocompatibility complex
CC       (MHC). Involved in the presentation of peptide antigens to the immune
CC       system (By similarity). {ECO:0000250}.
CC   -!- SUBUNIT: Heterodimer of an alpha chain and a beta chain. Beta-2-
CC       microglobulin is the beta-chain of major histocompatibility complex
CC       class I molecules (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the beta-2-microglobulin family. {ECO:0000305}.
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DR   EMBL; L04992; AAA37302.1; -; Genomic_DNA.
DR   EMBL; L04993; AAA37303.1; -; Genomic_DNA.
DR   EMBL; L04994; AAA37304.1; -; Genomic_DNA.
DR   EMBL; M84362; AAA39666.1; -; Genomic_DNA.
DR   PIR; I84730; I84730.
DR   AlphaFoldDB; Q04714; -.
DR   SMR; Q04714; -.
DR   PRIDE; Q04714; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0042612; C:MHC class I protein complex; IEA:UniProtKB-KW.
DR   GO; GO:0002474; P:antigen processing and presentation of peptide antigen via MHC class I; IEA:UniProtKB-KW.
DR   GO; GO:0006955; P:immune response; IEA:InterPro.
DR   CDD; cd05770; IgC_beta2m; 1.
DR   Gene3D; 2.60.40.10; -; 1.
DR   InterPro; IPR015707; B2Microglobulin.
DR   InterPro; IPR007110; Ig-like_dom.
DR   InterPro; IPR036179; Ig-like_dom_sf.
DR   InterPro; IPR013783; Ig-like_fold.
DR   InterPro; IPR003006; Ig/MHC_CS.
DR   InterPro; IPR003597; Ig_C1-set.
DR   PANTHER; PTHR19944:SF62; PTHR19944:SF62; 1.
DR   Pfam; PF07654; C1-set; 1.
DR   SMART; SM00407; IGc1; 1.
DR   SUPFAM; SSF48726; SSF48726; 1.
DR   PROSITE; PS50835; IG_LIKE; 1.
DR   PROSITE; PS00290; IG_MHC; 1.
PE   3: Inferred from homology;
KW   Disulfide bond; Immunity; Immunoglobulin domain; MHC I; Secreted.
FT   CHAIN           <1..>92
FT                   /note="Beta-2-microglobulin"
FT                   /id="PRO_0000080736"
FT   DOMAIN          2..89
FT                   /note="Ig-like C1-type"
FT   DISULFID        22..77
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00114"
FT   NON_TER         1
FT   NON_TER         92
SQ   SEQUENCE   92 AA;  10808 MW;  1F7E5C826A3D568E CRC64;
     RPQIQVYSRH PPENGKPNIL NCYVTQFHPP QIEIQMLKNG EIIPKVEMSD LSFSKDWSFY
     ILAHTEFTPT ETDQYACRVN HVSMDKPMTV NW