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UniProtKB/Swiss-Prot P01024: Variant p.Lys155Gln

Complement C3
Gene: C3
Variant information

Variant position:  155
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 Lysine (K) to Glutamine (Q) at position 155 (K155Q, p.Lys155Gln).
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 polar (Q)
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

Involvement in disease:  Macular degeneration, age-related, 9 (ARMD9) [MIM:611378]: A form of age-related macular degeneration, a multifactorial eye disease and the most common cause of irreversible vision loss in the developed world. In most patients, the disease is manifest as ophthalmoscopically visible yellowish accumulations of protein and lipid that lie beneath the retinal pigment epithelium and within an elastin-containing structure known as Bruch membrane. {ECO:0000269|PubMed:17634448, ECO:0000269|PubMed:24036952}. Note=Disease susceptibility is associated with variations 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 ARMD9; results in resistance to proteolytic inactivation by CFH and CFI.
Any additional useful information about the variant.

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



Sequence information

Variant position:  155
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1663
The length of the canonical sequence.

Location on the sequence:   DKTIYTPGSTVLYRIFTVNH  K LLPVGRTVMVNIENPEGIPV
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                         DKTIYTPGSTVLYRIFTVNHKLLPVGRTVMVNIENPEGIPV

Mouse                         DKTIYTPGSTVLYRIFTVDNNLLPVGKTVVILIETPDGIPV

Rat                           DKTIYTPGSTVFYRIFTVDNNLLPVGKTVVIVIETPDGVPI

Pig                           DKTIYTPGSTVLYRIFTVDHKLLPVGQTIVVTIETPEGIDI

Bovine                        DKTIYTPGSTVLYRVFTVDHKLLPVGQTVFITIETPDGIPV

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 23 – 1663 Complement C3
Chain 23 – 667 Complement C3 beta chain


Literature citations

Rare variants in CFI, C3 and C9 are associated with high risk of advanced age-related macular degeneration.
Seddon J.M.; Yu Y.; Miller E.C.; Reynolds R.; Tan P.L.; Gowrisankar S.; Goldstein J.I.; Triebwasser M.; Anderson H.E.; Zerbib J.; Kavanagh D.; Souied E.; Katsanis N.; Daly M.J.; Atkinson J.P.; Raychaudhuri S.;
Nat. Genet. 45:1366-1370(2013)
Cited for: VARIANT ARMD9 GLN-155; CHARACTERIZATION OF VARIANT ARMD9 GLN-155;

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.