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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P02671: Variant p.Cys55Arg

Fibrinogen alpha chain
Gene: FGA
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Variant information Variant position: help 55 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 Cysteine (C) to Arginine (R) at position 55 (C55R, p.Cys55Arg). 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 (C) to large size and basic (R) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 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 CAFBN; hypofibrinogenemia; heterozygous; decreased fibrinogen complex assembly; no effect on fibrinogen complex secretion. Any additional useful information about the variant.


Sequence information Variant position: help 55 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 866 The length of the canonical sequence.
Location on the sequence: help RGPRVVERHQSACKDSDWPF C SDEDWNYKCPSGCRMKGLID 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                         RGPRVVER-HQSACK-DSDWPFCSDEDWNYKCPSGCRMKGLID

Mouse                         RGPRVVER-HQSQCK-DSDWPFCSDDDWNHKCPSGCRMKGL

Rat                           RGPRIVER-QPSQCK-ETDWPFCSDEDWNHKCPSGCRMKGL

Bovine                        RGPRLVER-QQSACK-ETGWPFCSDEDWNTKCPSGCRMKGL

Chicken                       RGPRILENMHESSCKYEKNWPICVDDDWGTKCPSCCRMQGI
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 36 – 866 Fibrinogen alpha chain
Modified residue 45 – 45 Phosphoserine; by FAM20C
Modified residue 50 – 50 Phosphoserine
Modified residue 56 – 56 Phosphoserine; by FAM20C
Disulfide bond 47 – 47 Interchain
Disulfide bond 55 – 55 Interchain (with C-95 in beta chain)
Disulfide bond 64 – 64 Interchain (with C-49 in gamma chain)
Disulfide bond 68 – 68 Interchain (with C-106 in beta chain)



Literature citations
Clinical and molecular characterisation of 21 patients affected by quantitative fibrinogen deficiency.
Asselta R.; Plate M.; Robusto M.; Borhany M.; Guella I.; Solda G.; Afrasiabi A.; Menegatti M.; Shamsi T.; Peyvandi F.; Duga S.;
Thromb. Haemost. 113:567-576(2015)
Cited for: INVOLVEMENT IN CAFBN; VARIANTS CAFBN ARG-55; PRO-129 AND TRP-184; CHARACTERIZATION OF VARIANTS CAFBN ARG-55; PRO-129 AND TRP-184;
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.