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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35499: Variant p.Pro1158Ser

Sodium channel protein type 4 subunit alpha
Gene: SCN4A
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Variant information Variant position: help 1158 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 Proline (P) to Serine (S) at position 1158 (P1158S, p.Pro1158Ser). 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 hydrophobic (P) 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 HOKPP2; atypical phenotype with heat-induced myotonia and cold-induced paralysis with hypokalemia; changes the voltage-gated sodium channel activity; increases channel activation and slow inactivation at low temperature. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 1158 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1836 The length of the canonical sequence.
Location on the sequence: help RALSRFEGMRVVVNALLGAI P SIMNVLLVCLIFWLIFSIMG 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                         RALSRFEGMRVVVNALLGAIPSIMNVLLVCLIFWLIFSIMG

Mouse                         RALSRFEGMRVVVNALLGAIPSIMNVLLVCLIFWLIFSIMG

Rat                           RALSRFEGMRVVVNALLGAIPSIMNVLLVCLIFWLIFSIMG

Horse                         RALSRFEGMRVVVNALLGAIPSIMNVLLVCLIFWVIFSIMG
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 – 1836 Sodium channel protein type 4 subunit alpha
Topological domain 1143 – 1159 Cytoplasmic
Repeat 1013 – 1326 III
Helix 1157 – 1182



Literature citations
Temperature-sensitive sodium channelopathy with heat-induced myotonia and cold-induced paralysis.
Sugiura Y.; Aoki T.; Sugiyama Y.; Hida C.; Ogata M.; Yamamoto T.;
Neurology 54:2179-2181(2000)
Cited for: VARIANT HOKPP2 SER-1158; Cold-induced defects of sodium channel gating in atypical periodic paralysis plus myotonia.
Webb J.; Cannon S.C.;
Neurology 70:755-761(2008)
Cited for: VARIANT HOKPP2 SER-1158; CHARACTERIZATION OF VARIANT HOKPP2 SER-1158; FUNCTION; TRANSPORTER ACTIVITY; SUBCELLULAR LOCATION;
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.