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UniProtKB/Swiss-Prot Q13936: Variant p.Lys834Glu

Voltage-dependent L-type calcium channel subunit alpha-1C
Gene: CACNA1C
Variant information

Variant position:  834
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  US
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 Lysine (K) to Glutamate (E) at position 834 (K834E, p.Lys834Glu).
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 large size and basic (K) to medium size and acidic (E)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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:  In LQT8; unknown pathological significance.
Any additional useful information about the variant.



Sequence information

Variant position:  834
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  2221
The length of the canonical sequence.

Location on the sequence:   ESPPATKINMDDLQPNENED  K SPYPNPETTGEEDEEEPEMP
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                         ESPPATKINMDDLQPNENEDKSPYPNPETTGEEDEEEPEMP

Mouse                         ESPPTTKINMDDLQPSENEDKSPHSNPDTAGEEDEEEPEMP

Rat                           ESPPTTKINMDDLQPSENEDKSPHSNPDTAGEEDEEEPEMP

Rabbit                        ESPPTTKINMDDLQPNESEDKSPYPNPETTGEEDEEEPEMP

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 1 – 2221 Voltage-dependent L-type calcium channel subunit alpha-1C
Topological domain 746 – 900 Cytoplasmic
Region 764 – 861 Disordered
Region 829 – 876 Interaction with STAC2
Modified residue 815 – 815 Phosphoserine


Literature citations

Exome sequencing and systems biology converge to identify novel mutations in the L-type calcium channel, CACNA1C, linked to autosomal dominant long QT syndrome.
Boczek N.J.; Best J.M.; Tester D.J.; Giudicessi J.R.; Middha S.; Evans J.M.; Kamp T.J.; Ackerman M.J.;
Circ. Cardiovasc. Genet. 6:279-289(2013)
Cited for: VARIANTS LQT8 GLU-834; ARG-857; LEU-857 AND GLN-1989; CHARACTERIZATION OF VARIANT LQT8 ARG-857; FUNCTION; INVOLVEMENT IN LQT8;

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.