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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00387: Variant p.Cys204Arg

NADH-cytochrome b5 reductase 3
Gene: CYB5R3
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Variant information Variant position: help 204 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 204 (C204R, p.Cys204Arg). 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 METHB-CYB5R3; type 2. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 204 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 301 The length of the canonical sequence.
Location on the sequence: help ITPMLQVIRAIMKDPDDHTV C HLLFANQTEKDILLRPELEE 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                         ITPMLQVIRAIMKDPDDHTVCHLLFANQTEKDILLRPELEE

                              ITPMLQVIRAIIKDPHDPTVCHLLFANQTEKDILLRPELEE

Mouse                         ITPMLQVIRAVLKDPNDHTVCYLLFANQSEKDILLRPELEE

Rat                           ITPMLQVIRAVLKDPNDHTVCYLLFANQSEKDILLRPELEE

Bovine                        ITPMLQVIRAIMKDPDDHTVCHLLFANQTEKDILLRPELEE
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 2 – 301 NADH-cytochrome b5 reductase 3
Binding site 185 – 185
Mutagenesis 204 – 204 C -> S. No effect on NADH-cytochrome b5 reductase activity.
Beta strand 203 – 212



Literature citations
Four new mutations in the NADH-cytochrome b5 reductase gene from patients with recessive congenital methemoglobinemia type II.
Vieira L.M.; Kaplan J.-C.; Kahn A.; Leroux A.;
Blood 85:2254-2262(1995)
Cited for: VARIANTS METHB-CYB5R3 ARG-204 AND MET-273 DEL;
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.