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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00156: Variant p.Ile78Thr

Cytochrome b
Gene: MT-CYB
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Variant information Variant position: help 78 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 Isoleucine (I) to Threonine (T) at position 78 (I78T, p.Ile78Thr). 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 hydrophobic (I) to medium size and polar (T) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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

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


Sequence information Variant position: help 78 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 DASTAFSSIAHITRDVNYGW I IRYLHANGASMFFICLFLHI 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                         DASTAFSSIAHITRDVNYGWIIRYLHANGASMFFICLFLHI

Gorilla                       DASTAFSSIAHITRDVNYGWTIRYLHANGASMFFICLFLHI

                              DTATAFSSVTHICRDVNYGWIIRYMHANGASMFFICLFLHV

Rhesus macaque                DTSSAFSSIAHITRDVKYGWITRYLHANGASMLFICLFLHI

Chimpanzee                    DASTAFSSIAHITRDVNYGWIIRYLHANGASMFFICLFLHI

Mouse                         DTMTAFSSVTHICRDVNYGWLIRYMHANGASMFFICLFLHV

Rat                           DTMTAFSSVTHICRDVNYGWLIRYLHANGASMFFICLFLHV

Pig                           DTTTAFSSVTHICRDVNYGWVIRYLHANGASMFFICLFIHV

Bovine                        DTTTAFSSVTHICRDVNYGWIIRYMHANGASMFFICLYMHV

Rabbit                        DTTTAFSSVTHICRDVNYGWLIRYLHANGASMFFICLYMHV

Goat                          DTMTAFSSVTHICRDVNYGWIIRYMHANGASMFFICLFMHI

Sheep                         DTTTAFSSVTHICRDVNYGWIIRYMHANGASMFFICLFMHV

Cat                           DTMTAFSSVTHICRDVNYGWIIRYLHANGASMFFICLYMHV

Horse                         DTTTAFSSVTHICRDVNYGWIIRYLHANGASMFFICLFIHV

Chicken                       DTSLAFSSVAHTCRNVQYGWLIRNLHANGASFFFICIFLHI

Xenopus laevis                DTSMAFSSVAHICRDVNYGWLIRNLHANGASFFFICIYLHI

Zebrafish                     DISTAFSSVVHICRDVNFGWLIRSIHANGASFFFICLYIHI

Caenorhabditis elegans        DSLMAFSTVQYIMYEVNFGWVFRIFHFNGASLFFIFLYLHI

Drosophila                    DINLAFYSVNHICRDVNYGWLLRTLHANGASFFFICIYLHV

Slime mold                    HVDLAFNSIERLVREVDYGWLLRYIHANGASFFFIVVYIHM

Baker's yeast                 NIELAFSSVEHIMRDVHNGYILRYLHANGASFFFMVMFMHM

Fission yeast                 NMDLAFLSVERIVRDVNYGFLLRAFHANGASFFFIFLYLHI

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 77 – 98 Helical
Binding site 83 – 83 axial binding residue
Binding site 97 – 97 axial binding residue
Helix 76 – 103



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.