UniProt:P61769 B2M

chain
  • signal peptide:1-20
  • chain:21-119
  • chain:22-119
checksum AFD2DBEF07DCEF27
comment
  • FUNCTION Component of the class I major histocompatibility complex (MHC). Involved in the presentation of peptide antigens to the immune system. Exogenously applied M.tuberculosis EsxA or EsxA-EsxB (or EsxA expressed in host) binds B2M and decreases its export to the cell surface (total protein levels do not change), probably leading to defects in class I antigen presentation (PubMed:25356553).SUBUNIT Heterodimer of an alpha chain and a beta chain. Beta-2-microglobulin is the beta-chain of major histocompatibility complex class I molecules. Polymers of beta 2-microglobulin can be found in tissues from patients on long-term hemodialysis. B2M alone (not in complex with HLA-I) interacts with M.tuberculosis EsxA (ESAT-6) and an EsxA-EsxB (CFP-10) complex; the tripartite complex can be detected in the host endoplasmic reticulum (PubMed:25356553). The B2M-EsxA complex can be detected in patients with pleural tuberculosis and is stable from pH 4.0 to 8.0 and in the presence of 2M NaCl (PubMed:25356553). Forms a heterotrimer with HLA-E and a self- or a foreign peptide (PubMed:9427624). Forms a heterotrimer with HLA-G and a self-peptide (PubMed:17056715). Forms a heterotrimer with HLA-F and a self-peptide (PubMed:10605026). Forms a heterotrimer with MR1 and a metabolite antigen.INTERACTION Detected in serum and urine (PubMed:1336137, PubMed:7554280).SUBCELLULAR LOCATION (Microbial infection) In the presence of M.tuberculosis EsxA-EsxB complex decreased amounts of B2M are found on the cell surface (PubMed:25356553).PTM Glycation of Ile-21 is observed in long-term hemodialysis patients.DISEASE The disease is caused by variants affecting the gene represented in this entry.DISEASE The disease is caused by variants affecting the gene represented in this entry. Apart from the presence of causative mutations, beta-2-microglobulin may adopt the fibrillar configuration of amyloid when its serum levels are persistently high. High beta(2)-microglobulin serum levels result in amyloidosis in patients on long-term hemodialysis (PubMed:7918443). In contrast to patients with dialysis-related amyloidosis, patients with hereditary amyloidosis have normal circulating concentrations of beta2-microglobulin (PubMed:22693999).SIMILARITY Belongs to the beta-2-microglobulin family.ONLINE INFORMATION Beta-2-microglobulin entry
crossReference
databaseName UniProt
dbId 50591
description
  • recommendedName: Beta-2-microglobulin component recommendedName: Beta-2-microglobulin form pI 5.3 /component
displayName UniProt:P61769 B2M
geneName
  • B2M
  • CDABP0092
  • HDCMA22P
identifier P61769
isSequenceChanged false
keyword
  • 3D-structure
  • Amyloid
  • Amyloidosis
  • Direct protein sequencing
  • Disease variant
  • Disulfide bond
  • Glycation
  • Glycoprotein
  • Immunity
  • Immunoglobulin domain
  • MHC I
  • Pyrrolidone carboxylic acid
  • Reference proteome
  • Secreted
  • Signal
modified [InstanceEdit:12187927] Wright, Adam, 2024-03-12
name
  • B2M
otherIdentifier
  • 11756150_at
  • 11756151_x_at
  • 11758148_s_at
  • 11758192_s_at
  • 11758193_x_at
  • 11758260_x_at
  • 11758299_a_at
  • 11758300_x_at
  • 16800450
  • 201891_PM_s_at
  • 201891_s_at
  • 201_s_at
  • 216231_PM_s_at
  • 216231_s_at
  • 34644_at
  • 3592024
  • 3592025
  • 3592029
  • 3592030
  • 3592031
  • 3592032
  • 3592037
  • 3592038
  • 3592039
  • 3592040
  • 3592041
  • 3592042
  • 3592043
  • 3592044
  • 3592045
  • 3592046
  • 3592047
  • 3592048
  • 3592049
  • 428_s_at
  • 567
  • 74840_s_at
  • 7983360
  • 84385_at
  • A_14_P105156
  • A_14_P108160
  • A_14_P126371
  • A_23_P37441
  • GE79364
  • GO:0000139
  • GO:0001913
  • GO:0001916
  • GO:0002237
  • GO:0002376
  • GO:0002474
  • GO:0002481
  • GO:0002503
  • GO:0002726
  • GO:0005515
  • GO:0005576
  • GO:0005615
  • GO:0005764
  • GO:0005765
  • GO:0005768
  • GO:0005773
  • GO:0005783
  • GO:0005788
  • GO:0005794
  • GO:0005829
  • GO:0005886
  • GO:0005925
  • GO:0006457
  • GO:0006826
  • GO:0006879
  • GO:0006955
  • GO:0007155
  • GO:0007608
  • GO:0007611
  • GO:0009897
  • GO:0009986
  • GO:0010977
  • GO:0012507
  • GO:0016020
  • GO:0016192
  • GO:0019885
  • GO:0019886
  • GO:0023026
  • GO:0030154
  • GO:0030670
  • GO:0031410
  • GO:0031901
  • GO:0031902
  • GO:0031905
  • GO:0032092
  • GO:0033077
  • GO:0034756
  • GO:0035580
  • GO:0042026
  • GO:0042605
  • GO:0042612
  • GO:0042613
  • GO:0042802
  • GO:0042803
  • GO:0042824
  • GO:0043226
  • GO:0045646
  • GO:0048260
  • GO:0048856
  • GO:0050680
  • GO:0050768
  • GO:0050778
  • GO:0050870
  • GO:0050877
  • GO:0051289
  • GO:0055038
  • GO:0055065
  • GO:0060586
  • GO:0065003
  • GO:0070062
  • GO:0071281
  • GO:0071283
  • GO:0071316
  • GO:1900121
  • GO:1900122
  • GO:1904434
  • GO:1904437
  • GO:1904724
  • GO:1990000
  • GO:1990712
  • GO:2000774
  • GO:2000978
  • HMNXSV003031408
  • Hs.75415.2.S1_3p_a_at
  • ILMN_1725427
  • ILMN_2148459
  • J00105_s_at
  • PH_hs_0028895
  • S82297_at
  • TC15000342.hg
  • TC15002179.hg
  • g4757825_3p_a_at
physicalEntity
referenceDatabase [ReferenceDatabase:2] UniProt
referenceGene
referenceTranscript
schemaClass ReferenceGeneProduct
secondaryIdentifier
  • B2MG_HUMAN
  • P01884
  • Q540F8
  • Q6IAT8
  • Q9UCK0
  • Q9UD48
  • Q9UDF4
sequenceLength 119
species [Species:48887] Homo sapiens
url https://purl.uniprot.org/uniprot/P61769

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