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UniProtKB/Swiss-Prot Q07699: Variant p.Cys121Trp

Sodium channel subunit beta-1
Gene: SCN1B
Variant information

Variant position:  121
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 Cysteine (C) to Tryptophan (W) at position 121 (C121W, p.Cys121Trp).
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 medium size and polar (C) to large size and aromatic (W)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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:  In GEFS+1; can rescue the loss of function and defective trafficking to cell membrane phenotype of the SCN1A variant Thr-1852.
Any additional useful information about the variant.

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



Sequence information

Variant position:  121
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  218
The length of the canonical sequence.

Location on the sequence:   LQDLSIFITNVTYNHSGDYE  C HVYRLLFFENYEHNTSVVKK
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                         LQDLSIFITNVTYNHSGDYECHVYRLLFFENYEHNTSVVKK

                              LQDLSIFITNVTYNHSGDYECHVYRLLFFENYEHNTSVVKK

Chimpanzee                    LQDLSIFITNVTYNHSGDYECHVYRLLFFENYEHNTSVVKK

Mouse                         LQDLSIFITNVTYNHSGDYECHVYRLLFFDNYEHNTSVVKK

Rat                           LQDLSIFITNVTYNHSGDYECHVYRLLFFDNYEHNTSVVKK

Bovine                        LQDLSIFITNVTYNHSGDYECHVYRLLFFDNYEHNTSVVKK

Rabbit                        LQDLSIFITNVTYNHSGDYQCHVYRLLSFENYEHNTSVVKK

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.

TypePositionsDescription
Chain 19 – 218 Sodium channel subunit beta-1
Topological domain 19 – 160 Extracellular
Domain 22 – 150 Ig-like C2-type
Glycosylation 110 – 110 N-linked (GlcNAc...) asparagine
Glycosylation 114 – 114 N-linked (GlcNAc...) asparagine
Glycosylation 135 – 135 N-linked (GlcNAc...) asparagine
Disulfide bond 40 – 121
Beta strand 117 – 123


Literature citations

Febrile seizures and generalized epilepsy associated with a mutation in the Na(+)-channel beta-1 subunit gene SCN1B.
Wallace R.H.; Wang D.W.; Singh R.; Scheffer I.E.; George A.L. Jr.; Phillips H.A.; Saar K.; Reis A.; Johnson E.W.; Sutherland G.R.; Berkovic S.F.; Mulley J.C.;
Nat. Genet. 19:366-370(1998)
Cited for: VARIANT GEFS+1 TRP-121;

Modulatory proteins can rescue a trafficking defective epileptogenic Nav1.1 Na+ channel mutant.
Rusconi R.; Scalmani P.; Cassulini R.R.; Giunti G.; Gambardella A.; Franceschetti S.; Annesi G.; Wanke E.; Mantegazza M.;
J. Neurosci. 27:11037-11046(2007)
Cited for: CHARACTERIZATION OF VARIANT GEFS+1 TRP-121; INTERACTION WITH SCN1A; 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.