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UniProtKB/Swiss-Prot P04275: Variant p.Arg816Trp

von Willebrand factor
Gene: VWF
Variant information

Variant position:  816
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 Arginine (R) to Tryptophan (W) at position 816 (R816W, p.Arg816Trp).
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 large size and basic (R) to large size and aromatic (W)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -3
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:  Von Willebrand disease 2 (VWD2) [MIM:613554]: A hemorrhagic disorder due to defects in von Willebrand factor protein and resulting in altered platelet aggregation. Von Willebrand disease type 2 is characterized by qualitative deficiency and functional anomalies of von Willebrand factor. It is divided in different subtypes including 2A, 2B, 2M and 2N (Normandy variant). The mutant VWF protein in types 2A, 2B and 2M are defective in their platelet-dependent function, whereas the mutant protein in type 2N is defective in its ability to bind factor VIII. Clinical manifestations are mucocutaneous bleeding, such as epistaxis and menorrhagia, and prolonged bleeding after surgery or trauma. {ECO:0000269|PubMed:12406074, ECO:0000269|PubMed:1409710, ECO:0000269|PubMed:1419803, ECO:0000269|PubMed:1419804, ECO:0000269|PubMed:1420817, ECO:0000269|PubMed:1429668, ECO:0000269|PubMed:1672694, ECO:0000269|PubMed:1673047, ECO:0000269|PubMed:1729889, ECO:0000269|PubMed:1761120, ECO:0000269|PubMed:1832934, ECO:0000269|PubMed:1906179, ECO:0000269|PubMed:2010538, ECO:0000269|PubMed:2011604, ECO:0000269|PubMed:21592258, ECO:0000269|PubMed:2786201, ECO:0000269|PubMed:7620154, ECO:0000269|PubMed:7734373, ECO:0000269|PubMed:7789955, ECO:0000269|PubMed:8011991, ECO:0000269|PubMed:8123843, ECO:0000269|PubMed:8123844, ECO:0000269|PubMed:8338947, ECO:0000269|PubMed:8348943, ECO:0000269|PubMed:8376405, ECO:0000269|PubMed:8435341, ECO:0000269|PubMed:8486782, ECO:0000269|PubMed:8547152, ECO:0000269|PubMed:8622978}. 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 VWD2; Normandy type.
Any additional useful information about the variant.

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

Sequence information

Variant position:  816
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  2813
The length of the canonical sequence.

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.




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.

Chain 764 – 2813 von Willebrand factor
Domain 776 – 827 TIL 3
Region 788 – 833 E1
Disulfide bond 810 – 821
Alternative sequence 315 – 2813 Missing. In isoform 2.
Beta strand 814 – 816

Literature citations

Identification of two point mutations in the von Willebrand factor gene of three families with the 'Normandy' variant of von Willebrand disease.
Gaucher C.; Mercier B.; Jorieux S.; Oufkir D.; Mazurier C.;
Br. J. Haematol. 78:506-514(1991)
Cited for: VARIANTS VWD2 TRP-816 AND GLN-854;

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.