UniProtKB/Swiss-Prot P06681: Variant p.Cys131Tyr

Complement C2
Gene: C2
Chromosomal location: 6p21.3
Variant information

Variant position:  131
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 have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Cysteine (C) to Tyrosine (Y) at position 131 (C131Y, p.Cys131Tyr).
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 medium size and polar (C) to large size and aromatic (Y)
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:  Complement component 2 deficiency (C2D) [MIM:217000]: A rare defect of the complement classical pathway associated with the development of autoimmune disorders, mainly systemic lupus erythematosus. Skin and joint manifestations are common and renal disease is relatively rare. Patients with complement component 2 deficiency are also reported to have recurrent invasive infections. {ECO:0000269|PubMed:8621452, ECO:0000269|PubMed:9670930}. 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 C2D.
Any additional useful information about the variant.

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



Sequence information

Variant position:  131
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  752
The length of the canonical sequence.

Location on the sequence:   GNVSFECEDGFILRGSPVRQ  C RPNGMWDGETAVCDNGAGHC
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                         GNVSFECEDGFILRGSPVRQCRPNGMWDGETAVCDNGAGHC

Gorilla                       GNVSFECEDGFILRGSPVRQCRPNGMWDGETAVCDNGAGHC

Chimpanzee                    GNVSFECEDGFILRGSPVRHCCPNGMWDGETAVCDNGAGHC

Mouse                         SNVSFECEQDFTLRGSPVRYCRPNGLWDGETAVCDNGASHC

Bovine                        GNLSFECEDGFTLRGSAVRQCRPNGMWDGETAVCDNGASHC

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 21 – 752 Complement C2
Chain 21 – 243 Complement C2b fragment
Domain 87 – 146 Sushi 2
Glycosylation 112 – 112 N-linked (GlcNAc...)
Disulfide bond 89 – 131
Disulfide bond 117 – 144
Alternative sequence 1 – 147 MGPLMVLFCLLFLYPGLADSAPSCPQNVNISGGTFTLSHGWAPGSLLTYSCPQGLYPSPASRLCKSSGQWQTPGATRSLSKAVCKPVRCPAPVSFENGIYTPRLGSYPVGGNVSFECEDGFILRGSPVRQCRPNGMWDGETAVCDNG -> MRALCIRETCSSELGFSRNWSRRK. In isoform 2.
Alternative sequence 16 – 147 Missing. In isoform 3.
Beta strand 127 – 131


Literature citations

A novel type II complement C2 deficiency allele in an African-American family.
Zhu Z.B.; Atkinson T.P.; Volanakis J.E.;
J. Immunol. 161:578-584(1998)
Cited for: VARIANT C2D TYR-131;

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.