Expasy logo

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q14524: Variant p.Arg1623Leu

Sodium channel protein type 5 subunit alpha
Gene: SCN5A
Feedback?
Variant information Variant position: help 1623 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 Leucine (L) at position 1623 (R1623L, p.Arg1623Leu). 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 hydrophobic (L) 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 LQT3. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 1623 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2016 The length of the canonical sequence.
Location on the sequence: help IVGTVLSDIIQKYFFSPTLF R VIRLARIGRILRLIRGAKGI 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                         IVGTVLSDIIQKYFFSPTLFRVIRLARIGRILRLIRGAKGI

Mouse                         IVGTVLSDIIQKYFFSPTLFRVIRLARIGRILRLIRGAKGI

Rat                           IVGTVLSDIIQKYFFSPTLFRVIRLARIGRILRLIRGAKGI

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 – 2016 Sodium channel protein type 5 subunit alpha
Transmembrane 1621 – 1637 Helical; Name=S4 of repeat IV
Repeat 1510 – 1807 IV
Mutagenesis 1610 – 1610 D -> A. Complete loss of channel inhibition by the spider Jingzhaotoxin-I.
Mutagenesis 1610 – 1610 D -> R. High decrease in affinity to the sea anemone toxin anthopleurin-B.
Mutagenesis 1614 – 1614 K -> A. 4.2-fold decrease of channel inhibition potency by the spider Jingzhaotoxin-I.
Helix 1621 – 1626



Literature citations
Spectrum of mutations in long-QT syndrome genes. KVLQT1, HERG, SCN5A, KCNE1, and KCNE2.
Splawski I.; Shen J.; Timothy K.W.; Lehmann M.H.; Priori S.G.; Robinson J.L.; Moss A.J.; Schwartz P.J.; Towbin J.A.; Vincent G.M.; Keating M.T.;
Circulation 102:1178-1185(2000)
Cited for: VARIANTS LQT3 ASN-1114; VAL-1501; LEU-1623 AND HIS-1644; VARIANT ASN-1787; Compendium of cardiac channel mutations in 541 consecutive unrelated patients referred for long QT syndrome genetic testing.
Tester D.J.; Will M.L.; Haglund C.M.; Ackerman M.J.;
Heart Rhythm 2:507-517(2005)
Cited for: VARIANTS LQT3 LEU-125; LYS-245; GLN-404; LYS-406; MET-411; LYS-462; ASP-572; GLU-615; LEU-637; LEU-648; CYS-971; MET-1069; LYS-1225; LYS-1231; SER-1325; TYR-1458; GLU-1481; 1505-LYS--GLN-1507 DEL; LEU-1623; HIS-1644; ILE-1667; MET-1763; LEU-1766; MET-1777; MET-1779; LYS-1784; CYS-1795; ARG-1909 AND SER-1949; VARIANTS TRP-18; PHE-618 AND GLN-1958; Spectrum and prevalence of mutations from the first 2,500 consecutive unrelated patients referred for the FAMILION long QT syndrome genetic test.
Kapplinger J.D.; Tester D.J.; Salisbury B.A.; Carr J.L.; Harris-Kerr C.; Pollevick G.D.; Wilde A.A.; Ackerman M.J.;
Heart Rhythm 6:1297-1303(2009)
Cited for: VARIANTS LQT3 GLN-18; HIS-27; GLY-30; GLN-43; LYS-48; SER-52; GLN-53; GLY-104; GLY-115; LEU-125; PRO-212; GLN-222; TRP-225; MET-240; LEU-247; LYS-275; SER-289; TRP-340; CYS-367; MET-370; THR-397; LYS-406; VAL-409; MET-411; GLU-429 DEL; ALA-462; VAL-530; GLN-535; TRP-569; ILE-571; SER-572; VAL-572; 586-ALA-LEU-587 DEL; GLU-615; ARG-639; LYS-654; PRO-673; CYS-689; LEU-701; ILE-731; ARG-750; ASN-772; TYR-816; PHE-848; LYS-960; LEU-965; PHE-981; SER-997; ARG-1004; LYS-1053; MET-1069; VAL-1100; ASN-1114; ASN-1166; SER-1199; ILE-1212 DEL; MET-1283; MET-1304; SER-1325; SER-1326; VAL-1334; VAL-1338; SER-1432; SER-1472; CYS-1473; GLU-1481; LEU-1487; ARG-1488; ASP-1489; ARG-1493; SER-1495; VAL-1498; VAL-1501; ASN-1505; ILE-1532; PHE-1560; MET-1593; SER-1594; ILE-1596; PHE-1617 DEL; GLN-1623; LEU-1623; HIS-1626; CYS-1644; PHE-1650; THR-1652; ASN-1723; TRP-1739; HIS-1761; PHE-1761; MET-1763; MET-1777; MET-1779; LYS-1784; CYS-1795; HIS-1826; GLY-1839; TRP-1897; GLN-1901; ASN-1977; VAL-2004 AND CYS-2012;
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.