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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35523: Variant p.Gln552Arg

Chloride channel protein 1
Gene: CLCN1
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Variant information Variant position: help 552 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 Glutamine (Q) to Arginine (R) at position 552 (Q552R, p.Gln552Arg). 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 polar (Q) to large size and basic (R) 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 MCAD and MCAR; also found in myotonia levior; reduced chloride transport; changed calcium channel activity; changed channel gating; weak dominant negative effect. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 552 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 988 The length of the canonical sequence.
Location on the sequence: help LTGAVSHTVSTAVICFELTG Q IAHILPMMVAVILANMVAQS 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                         LTGAVSHTVSTAVICFELTGQIAHILPMMVAVILANMVAQS

                              LTGAVSHTVSTAVICFELTGQIAHILPMMVAVILANMVAQS

Mouse                         LTGAVSHTVSTAVICFELTGQIAHILPMMVAVILANMVAQS

Rat                           LTGAVSHTVSTAVICFELTGQIAHILPMMVAVILANMVAQS
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 – 988 Chloride channel protein 1
Intramembrane 522 – 554 Helical



Literature citations
A novel alteration of muscle chloride channel gating in myotonia levior.
Ryan A.; Ruedel R.; Kuchenbecker M.; Fahlke C.;
J. Physiol. (Lond.) 545:345-354(2002)
Cited for: FUNCTION; SUBCELLULAR LOCATION; CHARACTERIZATION OF VARIANT MYOTONIA LEVIOR ARG-552; Myotonia levior is a chloride channel disorder.
Lehmann-Horn F.; Mailaender V.; Heine R.; George A.L. Jr.;
Hum. Mol. Genet. 4:1397-1402(1995)
Cited for: VARIANT MCAD MET-290; VARIANT MYOTONIA LEVIOR ARG-552; VARIANT TRP-118; Mutations in dominant human myotonia congenita drastically alter the voltage dependence of the CIC-1 chloride channel.
Pusch M.; Steinmeyer K.; Koch M.C.; Jentsch T.J.;
Neuron 15:1455-1463(1995)
Cited for: VARIANT MCAD MET-290; VARIANT MCAR LYS-291; CHARACTERIZATION OF VARIANTS MCAD MET-290; GLN-317 AND LEU-480; CHARACTERIZATION OF VARIANT MCAR LYS-291; CHARACTERIZATION OF VARIANT MYOTONIA LEVIOR ARG-552; MUTAGENESIS OF ILE-290 AND GLU-291;
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.