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UniProtKB/Swiss-Prot P05106: Variant p.Asp749His

Integrin beta-3
Gene: ITGB3
Chromosomal location: 17q21.32
Variant information

Variant position:  749
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Aspartate (D) to Histidine (H) at position 749 (D749H, p.Asp749His).
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:  Change from medium size and acidic (D) to medium size and polar (H)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -1
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

Involvement in disease:  Bleeding disorder, platelet-type 16 (BDPLT16) [MIM:187800]: An autosomal dominant form of congenital macrothrombocytopenia associated with platelet anisocytosis. It is a disorder of platelet production. Affected individuals may have no or only mildly increased bleeding tendency. In vitro studies show mild platelet functional abnormalities. {ECO:0000269|PubMed:18065693}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In BDPLT16; the mutant protein is constitutively active; spontaneous FAK phosphosphorylation; abnormal cell shape.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  749
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  788
The length of the canonical sequence.

Location on the sequence:   AILLIGLAALLIWKLLITIH  D RKEFAKFEEERARAKWDTAN
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: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         AILLIGLAALLIWKLLITIHDRKEFAKFEEERARAKWDTAN

Mouse                         AILLIGLATLLIWKLLITIHDRKEFAKFEEERARAKWDTAN

Rat                           AILLIGLATLLIWKLLITIHDRKEFAKFEEERARAKWDTAN

Sequence annotation in neighborhood:  
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 27 – 788 Integrin beta-3
Topological domain 742 – 788 Cytoplasmic
Modified residue 767 – 767 Phosphothreonine
Turn 743 – 759


Literature citations

A nonsynonymous SNP in the ITGB3 gene disrupts the conserved membrane-proximal cytoplasmic salt bridge in the alphaIIbbeta3 integrin and cosegregates dominantly with abnormal proplatelet formation and macrothrombocytopenia.
Ghevaert C.; Salsmann A.; Watkins N.A.; Schaffner-Reckinger E.; Rankin A.; Garner S.F.; Stephens J.; Smith G.A.; Debili N.; Vainchenker W.; de Groot P.G.; Huntington J.A.; Laffan M.; Kieffer N.; Ouwehand W.H.;
Blood 111:3407-3414(2008)
Cited for: VARIANT BDPLT16 HIS-749; CHARACTERIZATION OF VARIANT BDPLT16 HIS-749;

A novel heterozygous ITGB3 p.T720del inducing spontaneous activation of integrin alphaIIbbeta3 in autosomal dominant macrothrombocytopenia with aggregation dysfunction.
Miyashita N.; Onozawa M.; Hayasaka K.; Yamada T.; Migita O.; Hata K.; Okada K.; Goto H.; Nakagawa M.; Hashimoto D.; Kahata K.; Kondo T.; Kunishima S.; Teshima T.;
Ann. Hematol. 97:629-640(2018)
Cited for: VARIANT BDPLT16 THR-746 DEL; CHARACTERIZATION OF VARIANTS BDPLT16 THR-746 DEL AND HIS-749;

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.