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UniProtKB/Swiss-Prot P00740: Variant p.Arg226Trp

Coagulation factor IX
Gene: F9
Variant information

Variant position:  226
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Arginine (R) to Tryptophan (W) at position 226 (R226W, p.Arg226Trp).
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

Variant description:  In HEMB; severe; Nagoya-1, Dernbach, Deventer, Idaho.
Any additional useful information about the variant.

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

Sequence information

Variant position:  226
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  461
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.

Human                         EAETILDNITQSTQS-------------FNDFTRVVGGEDAKPGQFPWQV-VLNG


Chimpanzee                    EAETILDNITQSTQS-------------FNDFTRVVGGEDA

Mouse                         TDGAILNNVTESSES-------------LNDFTRVVGGENA

Rat                           TNSTILDNLTENSEP-------------INDFTRVVGGENA

Bovine                        EAEIIWDNVTQSNQS-------------FDEFSRVVGGEDA

Cat                           EAEKNVDNVTQP----------------LNDLTRIVGGKTA


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 47 – 461 Coagulation factor IX
Propeptide 192 – 226 Activation peptide
Site 226 – 227 Cleavage; by factor XIa
Glycosylation 213 – 213 N-linked (GlcNAc...) asparagine
Glycosylation 215 – 215 O-linked (GalNAc...) threonine
Glycosylation 225 – 225 O-linked (GalNAc...) threonine
Disulfide bond 178 – 335 Interchain (between light and heavy chains)

Literature citations

Blood clotting factor IX BM Nagoya. Substitution of arginine 180 by tryptophan and its activation by alpha-chymotrypsin and rat mast cell chymase.
Suehiro K.; Kawabata S.; Miyata T.; Takeya H.; Takamatsu J.; Ogata K.; Kamiya T.; Saito H.; Niho Y.; Iwanaga S.;
J. Biol. Chem. 264:21257-21265(1989)

Mutations in hemophilia Bm occur at the Arg180-Val activation site or in the catalytic domain of factor IX.
Bertina R.M.; van der Linden I.K.; Mannucci P.M.; Reinalda-Poot H.H.; Cupers R.; Poort S.R.; Reitsma P.H.;
J. Biol. Chem. 265:10876-10883(1990)
Cited for: VARIANTS HEMB GLN-226; TRP-226; PHE-227 AND THR-414;

Molecular pathology of haemophilia B in Turkish patients: identification of a large deletion and 33 independent point mutations.
Onay U.V.; Kavakli K.; Kilinc Y.; Gurgey A.; Aktuglu G.; Kemahli S.; Ozbek U.; Caglayan S.H.;
Br. J. Haematol. 120:656-659(2003)
Cited for: VARIANTS HEMB TYR-28; LEU-43; GLN-43; SER-52; ASP-106; LYS-124; TYR-134; GLN-226; GLY-226; TRP-226; LYS-241; TYR-252; GLN-294; PHE-316; ARG-318; GLY-379; ILE-383; PHE-383; ILE-395; PHE-396; ARG-407 AND GLU-412;

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.