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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P04839: Variant p.His101Arg

Cytochrome b-245 heavy chain
Gene: CYBB
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Variant information Variant position: help 101 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 Histidine (H) to Arginine (R) at position 101 (H101R, p.His101Arg). 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 (H) to large size and basic (R) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 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 CGDX. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 101 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 570 The length of the canonical sequence.
Location on the sequence: help GSSACCSTRVRRQLDRNLTF H KMVAWMIALHSAIHTIAHLF 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                         GSSACCSTRVRRQLDRNLTFHKMVAWMIALHSAIHTIAHLF

Mouse                         GSSACCSTRIRRQLDRNLTFHKMVAWMIALHTAIHTIAHLF

Bovine                        GSSACCSTRIRRQLDRNLTFHKMVAWMIALHTAIHTIAHLF
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 – 570 Cytochrome b-245 heavy chain
Topological domain 70 – 102 Cytoplasmic
Domain 54 – 286 Ferric oxidoreductase
Binding site 101 – 101 axial binding residue
Binding site 115 – 115 axial binding residue
Helix 97 – 130



Literature citations
Point mutations in the beta-subunit of cytochrome b558 leading to X-linked chronic granulomatous disease.
Bolscher B.G.J.M.; de Boer M.; de Klein A.; Weening R.S.; Roos D.;
Blood 77:2482-2487(1991)
Cited for: VARIANTS CGDX ARG-101; THR-156; TYR-209; SER-244 AND ALA-389;
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.