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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9NY46: Variant p.Arg357Gln

Sodium channel protein type 3 subunit alpha
Gene: SCN3A
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Variant information Variant position: help 357 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 Arginine (R) to Glutamine (Q) at position 357 (R357Q, p.Arg357Gln). 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 large size and basic (R) to medium size and polar (Q) 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 FFEVF4; affects voltage-dependent sodium channel activity; smaller current density and slower activation compared to wild-type channels and increased current activation in response to depolarizing voltage ramps. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 357 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2000 The length of the canonical sequence.
Location on the sequence: help CGNGSDAGQCPEGYICVKAG R NPNYGYTSFDTFSWAFLSLF 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                         CGNGSDAGQCPEGYICVKAGRNPNYGYTSFDTFSWAFLSLF

Mouse                         CGNGSDAGQCPEGYICVKAGRNPNYGYTSFDTFSWAFLSLF

Rat                           CGNGSDAGQCPEGYICVKAGRNPNYGYTSFDTFSWAFLSLF
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 1 – 2000 Sodium channel protein type 3 subunit alpha
Topological domain 270 – 368 Extracellular
Repeat 110 – 455 I
Glycosylation 339 – 339 N-linked (GlcNAc...) asparagine



Literature citations
Novel SCN3A variants associated with focal epilepsy in children.
Vanoye C.G.; Gurnett C.A.; Holland K.D.; George A.L. Jr.; Kearney J.A.;
Neurobiol. Dis. 62:313-322(2014)
Cited for: INVOLVEMENT IN FFEVF4; FUNCTION; VARIANTS FFEVF4 GLN-357; ASN-815; LYS-1160 AND VAL-1372;
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.