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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00740: Variant p.Asn306Ser

Coagulation factor IX
Gene: F9
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Variant information Variant position: help 306 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 Asparagine (N) to Serine (S) at position 306 (N306S, p.Asn306Ser). 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 medium size and polar (N) to small size and polar (S) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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
Variant description: help In HEMB; mild. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 306 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 461 The length of the canonical sequence.
Location on the sequence: help ETEHTEQKRNVIRIIPHHNY N AAINKYNHDIALLELDEPLV 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                         ETEHTEQKRNVIRIIPHHNYNAAINKYNHDIALLELDEPLV

                              KREHTEQKRNVIRTILHHSYNATINKYNHDIALLELDEPLT

Chimpanzee                    ETEHTEQKRNVIRIIPHHNYNAAINKYNHDIALLELDEPLV

Mouse                         KKEDTEQRRNVIRTIPHHQYNATINKYSHDIALLELDKPLI

Rat                           EKEDTEQRRNVIRTIPHHQYNATINKYSHDIALLELDKPLI

Bovine                        KPEPTEQKRNVIRAIPYHSYNASINKYSHDIALLELDEPLE

Cat                           ETEHTEQKRNVIRTILHHSYNASVNKYSHDIALLELDEPLT

Chicken                       EDDHTEQRRQVVKILPYPTYNRTRNKHHNDIALLELDQPLT
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 47 – 461 Coagulation factor IX
Chain 227 – 461 Coagulation factor IXa heavy chain
Domain 227 – 459 Peptidase S1
Active site 315 – 315 Charge relay system
Binding site 286 – 286
Binding site 288 – 288
Binding site 291 – 291
Disulfide bond 178 – 335 Interchain (between light and heavy chains)
Mutagenesis 305 – 305 Y -> F. Strongly increases enzyme activity with a synthetic peptide substrate; when associated with T-311; A-365 and T-391.
Mutagenesis 311 – 311 K -> T. Strongly increases enzyme activity with a synthetic peptide substrate; when associated with F-305; A-365 and T-391.
Mutagenesis 312 – 312 Y -> A. Strongly decreases enzyme activity with a synthetic peptide substrate.
Turn 303 – 306



Literature citations
Functionally important regions of the factor IX gene have a low rate of polymorphism and a high rate of mutation in the dinucleotide CpG.
Koeberl D.D.; Bottema C.D.; Buerstedde J.-M.; Sommer S.S.;
Am. J. Hum. Genet. 45:448-457(1989)
Cited for: VARIANTS HEMB GLN-75; ASP-79; TRP-268; THR-279; SER-306; MET-342; ARG-357 AND ARG-453; VARIANT PHE-7;
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.