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UniProtKB/Swiss-Prot Q16281: Variant p.Gly557Arg

Cyclic nucleotide-gated cation channel alpha-3
Gene: CNGA3
Chromosomal location: 2q11.2
Variant information

Variant position:  557
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Glycine (G) to Arginine (R) at position 557 (G557R, p.Gly557Arg).
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 glycine (G) to large size and basic (R)
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

Involvement in disease:  Achromatopsia 2 (ACHM2) [MIM:216900]: An autosomal recessive, ocular stationary disorder due to the absence of functioning cone photoreceptors in the retina. It is characterized by total colorblindness, low visual acuity, photophobia and nystagmus. {ECO:0000269|PubMed:11536077, ECO:0000269|PubMed:14757870, ECO:0000269|PubMed:15712225, ECO:0000269|PubMed:15743887, ECO:0000269|PubMed:18521937, ECO:0000269|PubMed:24903488, ECO:0000269|PubMed:26493561, ECO:0000269|PubMed:9662398}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In ACHM2; the K(1/2) value is shifted toward a higher cGMP concentration by a factor of 3.0; no positive influence of the CNGB3 subunit in the cGMP sensitivity is observed; average cGMP maximum current is decreased to half of the mean wild-type value for the mutant CNGA3 + CNGB3.
Any additional useful information about the variant.

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



Sequence information

Variant position:  557
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  694
The length of the canonical sequence.

Location on the sequence:   QFVVLSDGSYFGEISILNIK  G SKSGNRRTANIRSIGYSDLF
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                         QFVVLSDGSYFGEISILNIKGSKSGNRRTANIRSIGYSDLF

Mouse                         QFVVLSDGSYFGEISILNIKGSKSGNRRTANIRSIGYSDLF

Bovine                        QFVVLGDGSYFGEISILNIKGSKSGNRRTANIRSIGYSDLF

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 – 694 Cyclic nucleotide-gated cation channel alpha-3
Topological domain 503 – 694 Cytoplasmic
Nucleotide binding 482 – 605 cGMP
Binding site 549 – 549 cGMP
Binding site 564 – 564 cGMP


Literature citations

Total colourblindness is caused by mutations in the gene encoding the alpha-subunit of the cone photoreceptor cGMP-gated cation channel.
Kohl S.; Marx T.; Giddings I.; Jaegle H.; Jacobson S.G.; Apfelstedt-Sylla E.; Zrenner E.; Sharpe L.T.; Wissinger B.;
Nat. Genet. 19:257-259(1998)
Cited for: VARIANTS ACHM2 LEU-163; GLN-283; TRP-283; ARG-291; TRP-410; MET-529; LEU-547 AND ARG-557; VARIANT MET-153;

CNGA3 mutations in hereditary cone photoreceptor disorders.
Wissinger B.; Gamer D.; Jaegle H.; Giorda R.; Marx T.; Mayer S.; Tippmann S.; Broghammer M.; Jurklies B.; Rosenberg T.; Jacobson S.G.; Sener E.C.; Tatlipinar S.; Hoyng C.B.; Castellan C.; Bitoun P.; Andreasson S.; Rudolph G.; Kellner U.; Lorenz B.; Wolff G.; Verellen-Dumoulin C.; Schwartz M.; Cremers F.P.M.; Apfelstedt-Sylla E.; Zrenner E.; Salati R.; Sharpe L.T.; Kohl S.;
Am. J. Hum. Genet. 69:722-737(2001)
Cited for: VARIANTS ACHM2 VAL-162; LEU-163; CYS-181; TYR-182; PHE-186; TYR-191; LYS-194; TRP-223; ARG-224; ASN-260; ASP-267; CYS-277; HIS-277; TRP-283; GLN-283; ARG-291; ILE-312 DEL; PRO-341; SER-369; SER-372; SER-380; THR-406; TRP-410; CYS-427; TRP-436; SER-471; VAL-485; SER-510; GLU-513; GLU-516; THR-522; ASP-525; MET-529; LEU-547; ARG-557; HIS-563; MET-565; HIS-569; CYS-573 AND LYS-593;

Mutations in CNGA3 impair trafficking or function of cone cyclic nucleotide-gated channels, resulting in achromatopsia.
Reuter P.; Koeppen K.; Ladewig T.; Kohl S.; Baumann B.; Wissinger B.;
Hum. Mutat. 29:1228-1236(2008)
Cited for: VARIANTS ACHM2 LYS-228; CYS-277; GLN-283; TRP-439; THR-469; LEU-547 AND ARG-557; CHARACTERIZATION OF VARIANTS ACHM2 LYS-228; GLN-283; ARG-291; TRP-439; THR-469; LEU-547; ARG-557 AND LYS-590;

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.