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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P51649: Variant p.Gly268Glu

Succinate-semialdehyde dehydrogenase, mitochondrial
Gene: ALDH5A1
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Variant information Variant position: help 268 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 Glycine (G) to Glutamate (E) at position 268 (G268E, p.Gly268Glu). 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 glycine (G) to medium size and acidic (E) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -2 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 SSADHD; <1% of activity. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 268 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 535 The length of the canonical sequence.
Location on the sequence: help GIPSGVYNVIPCSRKNAKEV G EAICTDPLVSKISFTGSTTT 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                         GIPSGVYNVIPCSRKNAKEVGEAICTDPLVSKISFTGSTTT

Gorilla                       GIPSGVYNVIPCSRKNAKEVGEAICTDPLVSKISFTGSTTT

Chimpanzee                    GIPSGVYNVIPCSRKNAKEVGEAICTDPLVSKISFTGSTTT

Mouse                         GIPAGVYNVIPCSRNKAKEVGEVLCTDPLVSKISFTGSTAT

Rat                           GIPPGVYNVIPCSRTKAKEVGEVLCTDPLVSKISFTGSTAT
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 48 – 535 Succinate-semialdehyde dehydrogenase, mitochondrial
Modified residue 265 – 265 N6-acetyllysine; alternate
Modified residue 265 – 265 N6-succinyllysine; alternate
Helix 261 – 271



Literature citations
Prenatal diagnosis of succinic semialdehyde dehydrogenase deficiency: increased accuracy employing DNA, enzyme, and metabolite analyses.
Hogema B.M.; Akaboshi S.; Taylor M.; Salomons G.S.; Jakobs C.; Schutgens R.B.; Wilcken B.; Worthington S.; Maropoulos G.; Grompe M.; Gibson K.M.;
Mol. Genet. Metab. 72:218-222(2001)
Cited for: VARIANTS SSADHD GLU-268 AND ASP-409; Mutational spectrum of the succinate semialdehyde dehydrogenase (ALDH5A1) gene and functional analysis of 27 novel disease-causing mutations in patients with SSADH deficiency.
Akaboshi S.; Hogema B.M.; Novelletto A.; Malaspina P.; Salomons G.S.; Maropoulos G.D.; Jakobs C.; Grompe M.; Gibson K.M.;
Hum. Mutat. 22:442-450(2003)
Cited for: VARIANTS SSADHD PHE-93; ARG-176; TYR-223; MET-233; SER-255; GLU-268; LYS-335; GLN-382; LEU-382; ASP-409 AND ARG-533; VARIANTS ARG-36; TYR-180; LEU-182; SER-237 AND ILE-406; CHARACTERIZATION OF VARIANTS ARG-36; PHE-93; ARG-176; TYR-180; LEU-182; TYR-223; MET-233; SER-237; SER-255; GLU-268; LYS-335; LEU-382; ASP-409 AND ARG-533; 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.