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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P08514: Variant p.Tyr174His

Integrin alpha-IIb
Gene: ITGA2B
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Variant information Variant position: help 174 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 Tyrosine (Y) to Histidine (H) at position 174 (Y174H, p.Tyr174His). 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 (Y) to medium size and polar (H) 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 GT1; abolishes the binding function of alpha-IIb/beta-3 for soluble ligands without disturbing alpha-IIb/beta-3 expression; functional defect is likely caused by its allosteric effect rather than by a defect in the ligand-binding site itself. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 174 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1039 The length of the canonical sequence.
Location on the sequence: help EKTPVGSCFLAQPESGRRAE Y SPCRGNTLSRIYVENDFSWD 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                         EKTPVGSCFLAQPESGRRAEYSPCRGNTLSRIYVENDFSWD

Mouse                         EKTPVGGCFLAQLQSGGRAEYSPCRANTMSSVYAES-FRGD
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 32 – 1039 Integrin alpha-IIb
Chain 32 – 887 Integrin alpha-IIb heavy chain
Topological domain 32 – 993 Extracellular
Beta strand 170 – 174



Literature citations
A naturally occurring Tyr143His alpha IIb mutation abolishes alpha IIb beta 3 function for soluble ligands but retains its ability for mediating cell adhesion and clot retraction: comparison with other mutations causing ligand-binding defects.
Kiyoi T.; Tomiyama Y.; Honda S.; Tadokoro S.; Arai M.; Kashiwagi H.; Kosugi S.; Kato H.; Kurata Y.; Matsuzawa Y.;
Blood 101:3485-3491(2003)
Cited for: VARIANT GT1 HIS-174; CHARACTERIZATION OF VARIANT GT1 HIS-174;
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.