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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P13804: Variant p.Thr266Met

Electron transfer flavoprotein subunit alpha, mitochondrial
Gene: ETFA
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Variant information Variant position: help 266 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 Threonine (T) to Methionine (M) at position 266 (T266M, p.Thr266Met). 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 (T) to medium size and hydrophobic (M) 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 GA2A; decreased electron transfer activity. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 266 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 333 The length of the canonical sequence.
Location on the sequence: help GASRAAVDAGFVPNDMQVGQ T GKIVAPELYIAVGISGAIQH 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                         GASRAAVDAGFVPNDMQVGQTGKIVAPELYIAVGISGAIQH

Mouse                         GASRAAVDAGFVPNDMQVGQTGKIVAPELYIAVGISGAIQH

Rat                           GASRAAVDAGFVPNDMQVGQTGKIVAPELYIAVGISGAIQH

Bovine                        GASRAAVDAGFVTNDLQVGQTGKIVAPELYIAVGISGAIQH

Caenorhabditis elegans        GASRAAVDAGYVPNDMQVGQTGKIVAPELYIAIGISGAIQH

Slime mold                    GASRAAVDSGFVSNDLQVGQTGKIVAPELYIAVGISGAIQH

Baker's yeast                 GATRASVDNGLCDNSLQIGQTGKVVAPNLYIAIGVSGAVQH

Fission yeast                 GATRVAVDSGYADNSLQIGQTGKIIAPKLYIAVGIDGAIQH
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 20 – 333 Electron transfer flavoprotein subunit alpha, mitochondrial
Region 205 – 333 Domain II
Binding site 248 – 248
Binding site 263 – 266
Mutagenesis 249 – 249 R -> A. Loss of electron transfer activity.



Literature citations
Clear relationship between ETF/ETFDH genotype and phenotype in patients with multiple acyl-CoA dehydrogenation deficiency.
Olsen R.K.J.; Andresen B.S.; Christensen E.; Bross P.; Skovby F.; Gregersen N.;
Hum. Mutat. 22:12-23(2003)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; ALTERNATIVE SPLICING; FUNCTION; VARIANT GA2A MET-266; Glutaric acidemia type II. Heterogeneity in beta-oxidation flux, polypeptide synthesis, and complementary DNA mutations in the alpha subunit of electron transfer flavoprotein in eight patients.
Freneaux E.; Sheffield V.C.; Molin L.; Shires A.; Rhead W.;
J. Clin. Invest. 90:1679-1686(1992)
Cited for: VARIANTS GA2A ARG-116 AND MET-266; FUNCTION; CHARACTERIZATION OF VARIANT GA2A MET-266; Expression and characterization of two pathogenic mutations in human electron transfer flavoprotein.
Salazar D.; Zhang L.; deGala G.D.; Frerman F.E.;
J. Biol. Chem. 272:26425-26433(1997)
Cited for: CHARACTERIZATION OF VARIANTS GA2A ARG-116 AND MET-266; FUNCTION; COFACTOR; SUBUNIT;
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.