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UniProtKB/Swiss-Prot P00736: Variant p.Thr186Arg

Complement C1r subcomponent
Gene: C1R
Variant information

Variant position:  186
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LB/B
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:  From Threonine (T) to Arginine (R) at position 186 (T186R, p.Thr186Arg).
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 (T) to large size and basic (R)
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

Polymorphism:  Complement component C1r deficiency [MIM:216950] leads to the failure of the classical complement system activation pathway (C1 deficiency). Individuals with C1 deficiency are highly susceptible to infections by microorganisms and have greater risk in developing autoimmune diseases such as systemic lupus erythematosus (SLE).
Additional information on the polymorphism described.

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



Sequence information

Variant position:  186
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  705
The length of the canonical sequence.

Location on the sequence:   HNYVGGYFCSCRPGYELQED  T HSCQAECSSELYTEASGYIS
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.

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 18 – 705 Complement C1r subcomponent
Chain 18 – 463 Complement C1r subcomponent heavy chain
Domain 142 – 190 EGF-like; calcium-binding
Modified residue 167 – 167 (3R)-3-hydroxyasparagine
Modified residue 206 – 206 Phosphoserine; by CK2
Disulfide bond 176 – 189


Literature citations

Nucleotide sequence of the cDNA coding for human complement C1r.
Leytus S.P.; Kurachi K.; Sakariassen K.S.; Davie E.W.;
Biochemistry 25:4855-4863(1986)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANT ARG-186;

Cloning and sequencing of full-length cDNA encoding the precursor of human complement component C1r.
Journet A.; Tosi M.;
Biochem. J. 240:783-787(1986)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANTS LEU-152 AND ARG-186;

The human complement component C1R gene: the exon-intron structure and the molecular basis of allelic diversity.
Nakagawa M.; Yuasa I.; Irizawa Y.; Umetsu K.;
Ann. Hum. Genet. 67:207-215(2003)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS HIS-131; LEU-152; TYR-163; LYS-184; ARG-186 AND ARG-261;

The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).
The MGC Project Team;
Genome Res. 14:2121-2127(2004)
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA]; VARIANTS LEU-152 AND ARG-186;

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.