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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P13804: Variant p.Thr171Ile

Electron transfer flavoprotein subunit alpha, mitochondrial
Gene: ETFA
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Variant information Variant position: help 171 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 Threonine (T) to Isoleucine (I) at position 171 (T171I, p.Thr171Ile). 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 (I) 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 Decreased protein stability. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 171 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 GNALCTVKCDEKVKVFSVRG T SFDAAATSGGSASSEKASST 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                         GNALCTVKCDEKVKVFSVRGTSFDAAATSG-GSASSEKASST

Mouse                         GNALCTVKCDEKVKVFSVRGTSFEAAATSG-GSASSEKAPS

Rat                           GNALCTVKCDEKVKVFSVRGTSFEAAAASG-GSASSEKAPS

Bovine                        GNAICTVKCDEKVKVFSVRGTSFEAAAASG-GSASSEKASS

Caenorhabditis elegans        GNAVKKVKSTAPIKLLTFRGTSFE-PAKEG-GSGAVENAPS

Slime mold                    GNAIATVKSTDKCKVGTVRTTAFDKAPTSG-GSAKVVSAND

Baker's yeast                 GNIISTIECQAEKKLLIIRASAFPPIAEGSMDSVTIEKRTD

Fission yeast                 GNVNVTVSTKDPIKIVTVRASAFDAAPSSGEGAATVVEGID

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 20 – 204 Domain I
Modified residue 158 – 158 N6-acetyllysine; alternate
Modified residue 158 – 158 N6-succinyllysine; alternate
Modified residue 164 – 164 N6-acetyllysine
Modified residue 187 – 187 N6-succinyllysine
Helix 170 – 172



Literature citations
A polymorphic variant in the human electron transfer flavoprotein alpha-chain (alpha-T171) displays decreased thermal stability and is overrepresented in very-long-chain acyl-CoA dehydrogenase-deficient patients with mild childhood presentation.
Bross P.; Pedersen P.; Winter V.; Nyholm M.; Johansen B.N.; Olsen R.K.; Corydon M.J.; Andresen B.S.; Eiberg H.; Kolvraa S.; Gregersen N.;
Mol. Genet. Metab. 67:138-147(1999)
Cited for: VARIANT ILE-171; CHARACTERIZATION OF VARIANT ILE-171; FUNCTION;
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.