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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00156: Variant p.Ala39Val

Cytochrome b
Gene: MT-CYB
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Variant information Variant position: help 39 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Alanine (A) to Valine (V) at position 39 (A39V, p.Ala39Val). 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 small size and hydrophobic (A) to medium size and hydrophobic (V) 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

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


Sequence information Variant position: help 39 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 380 The length of the canonical sequence.
Location on the sequence: help IDLPTPSNISAWWNFGSLLG A CLILQITTGLFLAMHYSPDA 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                         IDLPTPSNISAWWNFGSLLGACLILQITTGLFLAMHYSPDA

Gorilla                       IDLPTPSNISTWWNFGSLLGACLILQITTGLFLAMHYSPDA

                              IDLPAPSNISAWWNFGSLLGVCLILQILTGLFLAMHYTSDT

Rhesus macaque                IDLPAPPNLSMWWNFGSLLAACLILQIITGLLLAMHYSPDT

Chimpanzee                    IDLPTPSNISAWWNFGSLLGACLILQITTGLFLAMHYSPDA

Mouse                         IDLPAPSNISSWWNFGSLLGVCLMVQIITGLFLAMHYTSDT

Rat                           IDLPAPSNISSWWNFGSLLGVCLMVQILTGLFLAMHYTSDT

Pig                           IDLPAPSNISSWWNFGSLLGICLILQILTGLFLAMHYTSDT

Bovine                        IDLPAPSNISSWWNFGSLLGICLILQILTGLFLAMHYTSDT

Rabbit                        IDLPAPSNISAWWNFGSLLGLCLMIQIFTGLFLAMHYTSDT

Goat                          IDLPTPSNISSWWNFGSLLGICLILQILTGLFLAMHYTSDT

Sheep                         IDLPAPSNISSWWNFGSLLGICLILQILTGLFLAMHYTPDT

Cat                           IDLPAPSNISAWWNFGSLLGVCLTLQILTGLFLAMHYTSDT

Horse                         IDLPAPSNISSWWNFGSLLGICLILQILTGLFLAMHYTSDT

Chicken                       IDLPAPSNISAWWNFGSLLAVCLMTQILTGLLLAMHYTADT

Xenopus laevis                IDLPTPSNISSLWNFGSLLGVCLIAQIITGLFLAMHYTADT

Zebrafish                     VDLPTPLNISAWWNFGSLLGLCLITQILTGLFLAMHYTSDI

Caenorhabditis elegans        VTLPSSKTLTLSWNFGSMLGMVLIFQILTGTFLAFYYTPDS

Drosophila                    VDLPAPINISSWWNFGSLLGLCLIIQILTGLFLAMHYTADI

Slime mold                    VRYPEPANISYLWNFGFFSLICLIIQLVSGILLAMHYSAHV

Baker's yeast                 IDSPQPSSINYWWNMGSLLGLCLVIQIVTGIFMAMHYSSNI

Fission yeast                 IDAPEPSNISYFWNFGSLLACVLVIQIVIGILLACFYIPNM

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 1 – 380 Cytochrome b
Transmembrane 33 – 53 Helical
Helix 32 – 52



Literature citations
Mitochondrial genome variation and the origin of modern humans.
Ingman M.; Kaessmann H.; Paeaebo S.; Gyllensten U.;
Nature 408:708-713(2000)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-378; VARIANTS ILE-7; SER-8; LEU-18; VAL-39; THR-78; THR-122; ALA-123; THR-153; ALA-194; THR-229; ILE-236; THR-306; THR-329; VAL-334; MET-353; MET-356 AND ILE-368;
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.