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UniProtKB/Swiss-Prot Q12791: Variant p.Glu884Lys

Calcium-activated potassium channel subunit alpha-1
Gene: KCNMA1
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Variant information Variant position: help 884 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 Glutamate (E) to Lysine (K) at position 884 (E884K, p.Glu884Lys). 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 acidic (E) to large size and basic (K) 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 PNKD3. Any additional useful information about the variant.


Sequence information Variant position: help 884 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1236 The length of the canonical sequence.
Location on the sequence: help LRASNFHYHELKHIVFVGSI E YLKREWETLHNFPKVSILPG 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                         LRASNFHYHELKHIVFVGSIEYLKREWETLHNFPKVSILPG

Mouse                         LRASNFHYHELKHIVFVGSIEYLKREWETLHNFPKVSILPG

Rat                           LRASNFHYHELKHIVFVGSIEYLKREWETLHNFPKVSILPG

Bovine                        LRASNFHYHELKHIVFVGSIEYLKREWETLHNFPKVSILPG

Rabbit                        LRASNFHYHELKHIVFVGSIEYLKREWETLHNFPKVSILPG

Chicken                       LRASNFHYHELKHIVFVGSLEYLRREWETLHNFPKVSILPG

Xenopus laevis                LRASNFHYHELKHIVFVGSLDYIKREWETLHNFPKVSILPG
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 – 1236 Calcium-activated potassium channel subunit alpha-1
Topological domain 389 – 1236 Cytoplasmic
Alternative sequence 169 – 1236 Missing. In isoform 6.
Helix 883 – 889



Literature citations
De novo KCNMA1 mutations in children with early-onset paroxysmal dyskinesia and developmental delay.
Zhang Z.B.; Tian M.Q.; Gao K.; Jiang Y.W.; Wu Y.;
Mov. Disord. 30:1290-1292(2015)
Cited for: INVOLVEMENT IN PNKD3; VARIANTS PNKD3 LYS-884 AND SER-1053;
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.