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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P03923: Variant p.Ile26Met

NADH-ubiquinone oxidoreductase chain 6
Gene: MT-ND6
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Variant information Variant position: help 26 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 Isoleucine (I) to Methionine (M) at position 26 (I26M, p.Ile26Met). 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 Similar physico-chemical property. Both residues are medium size and hydrophobic. 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
Variant description: help In LDYT; decrease in enzyme activity. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 26 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 174 The length of the canonical sequence.
Location on the sequence: help FLLSVGLVMGFVGFSSKPSP I YGGLVLIVSGVVGCVIILNF 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                         FLLSVG-LVMGFVGFSSKPSPIYGGLVLIVSGVVGCVIILNF

Gorilla                       FLLSVG-LVMGFVGFSSKPSPIYGGLVLIVSGVVGCAIILN

                              FILSIV-FVMSFVGFATKPSPIYGGLVLIISGGIGCAIVLN

Chimpanzee                    FLLSVS-LVMGFVGFSSKPSPIYGGLVLIVSGVVGCAIILN

Mouse                         FVLSSL-FLVGCLGLALKPSPIYGGLGLIVSGFVGCLMVLG

Rat                           FILSLL-FLTGCLGLALKPSPIYGGLGLIVSGCIGCLMVLG

Pig                           FILSTI-FVIGFVGFSSKPSPIYGGLGLIVSGGVGCGIVLN

Bovine                        FILSVI-FVMGFVGFSSKPSPIYGGLGLIVSGGVGCGIVLN

Rabbit                        FLLSVM-FVMGFVGFSSKPSPIYGGLGLIVSGGVGCGIVLS

Sheep                         FILSII-FVMGFVGFSSKPSPIYGGLGLIVSGGVGCGIVLN

Cat                           FILSTV-FVVSFVSFSSKPSPIYGGFGLIVAGGTGCGIVLN

Horse                         FILSVI-FVVSFVGFSSKPSPIYGGLVLIVSGGVGCGIIMN

Chicken                       IFLGIC-FMLGVLAVASNPSPYYGVVGLVVASVMGCGWLVS

Xenopus laevis                SVSMMV-LVLGLVAVASNPSPFYAALGLVLAAGAGCLVIVS

Zebrafish                     FLMAAL--VGGMIAIASNPAPYFAAFGLVVVAGVGCGILVS

Caenorhabditis elegans        FVLAVLSSIISYINIDPMKSSFFLIFSLLFS-----MPVIS

Drosophila                    LMLYSL-IITTSIIFLNMIHPLALGLTLLIQTIFVCLLTGL

Slime mold                    IMLLGI-IIMCTLVILRSVNPIYSILNLIVIYGCYASILLT
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 – 174 NADH-ubiquinone oxidoreductase chain 6
Transmembrane 26 – 46 Helical



Literature citations
Genetic and biochemical impairment of mitochondrial complex I activity in a family with Leber hereditary optic neuropathy and hereditary spastic dystonia.
de Vries D.D.; Went L.N.; Bruyn G.W.; Scholte H.R.; Hofstra R.M.W.; Bolhuis P.A.; van Oost B.A.;
Am. J. Hum. Genet. 58:703-711(1996)
Cited for: VARIANT LDYT MET-26; CHARACTERIZATION OF VARIANT LDYT MET-26; FUNCTION; CATALYTIC ACTIVITY;
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.