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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00451: Variant p.Met721Leu

Coagulation factor VIII
Gene: F8
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Variant information Variant position: help 721 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 Methionine (M) to Leucine (L) at position 721 (M721L, p.Met721Leu). 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 Similar physico-chemical property. Both residues are medium size and hydrophobic. 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 HEMA; mild. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 721 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2351 The length of the canonical sequence.
Location on the sequence: help MENPGLWILGCHNSDFRNRG M TALLKVSSCDKNTGDYYEDS 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                         MENPGLWILGCHNSDFRNRGMTALLKVSSCDKNTGDYYEDS

                              MENPGLWVLGCHNSDFRNRGMTALLKVSSCNRNIDDYYEDT

Mouse                         MENPGLWVLGCHNSDFRKRGMTALLKVSSCDKSTSDYYEEI

Pig                           MENPGLWVLGCHNSDLRNRGMTALLKVYSCDRDIGDYYDNT
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 20 – 2351 Coagulation factor VIII
Chain 20 – 1332 Factor VIIIa heavy chain, 200 kDa isoform
Chain 20 – 759 Factor VIIIa heavy chain, 92 kDa isoform
Domain 399 – 730 F5/8 type A 2
Domain 583 – 730 Plastocyanin-like 4
Modified residue 737 – 737 Sulfotyrosine
Modified residue 738 – 738 Sulfotyrosine
Disulfide bond 649 – 730
Alternative sequence 9 – 2143 Missing. In isoform 2.



Literature citations
A domain mutations in 65 haemophilia A families and molecular modelling of dysfunctional factor VIII proteins.
Liu M.; Murphy M.E.P.; Thompson A.R.;
Br. J. Haematol. 103:1051-1060(1998)
Cited for: VARIANTS HEMA LYS-98; GLY-101; CYS-133; HIS-145; ALA-159; LYS-163; ASP-164; PRO-179; MET-181; LYS-291; ALA-297; GLU-303; SER-312; HIS-391; ILE-427; TRP-437; ASN-450; ILE-454; LEU-470; SER-541; TRP-546; CYS-550; HIS-550; PRO-553; THR-560; ALA-578; ARG-603; ILE-633; ASN-683; LEU-721; CYS-742; THR-1698; GLY-1715; ARG-1779; THR-1791; HIS-1800; ALA-1801; PHE-1901; GLN-1960; GLN-1985; ILE-2007; TRP-2016; ASP-2022; ASN-2030 AND SER-2038;
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.