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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P57087: Variant p.Trp168Cys

Junctional adhesion molecule B
Gene: JAM2
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Variant information Variant position: help 168 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance
Residue change: help From Tryptophan (W) to Cysteine (C) at position 168 (W168C, p.Trp168Cys). Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.
Physico-chemical properties: help Change from large size and aromatic (W) to medium size and polar (C) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -2 The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page
Variant description: help In IBGC8; loss of localization to the plasma membrane; mainly retained in the cytoplasm. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 168 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 298 The length of the canonical sequence.
Location on the sequence: help GTVVELRCQDKEGNPAPEYT W FKDGIRLLENPRLGSQSTNS The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.
Residue conservation: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         GTVVELRCQDKEGNPAPEYTWFKDGIRLLENPRLGSQSTNS

Mouse                         GSVVELRCQDKEGNPAPEYIWFKDGTSLLGNPK-GGTHNNS
Sequence annotation in neighborhood: help The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.
TypePositionsDescription
Chain 29 – 298 Junctional adhesion molecule B
Topological domain 29 – 238 Extracellular
Domain 134 – 238 Ig-like C2-type
Glycosylation 187 – 187 N-linked (GlcNAc...) asparagine
Disulfide bond 155 – 214



Literature citations
Biallelic loss-of-function mutations in JAM2 cause primary familial brain calcification.
Cen Z.; Chen Y.; Chen S.; Wang H.; Yang D.; Zhang H.; Wu H.; Wang L.; Tang S.; Ye J.; Shen J.; Wang H.; Fu F.; Chen X.; Xie F.; Liu P.; Xu X.; Cao J.; Cai P.; Pan Q.; Li J.; Yang W.; Shan P.F.; Li Y.; Liu J.Y.; Zhang B.; Luo W.;
Brain 143:491-502(2020)
Cited for: VARIANT IBGC8 CYS-168; CHARACTERIZATION OF VARIANT IBGC8 CYS-168; SUBCELLULAR LOCATION; TISSUE SPECIFICITY;
Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.