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UniProtKB/Swiss-Prot P51649: Variant p.Cys223Tyr

Succinate-semialdehyde dehydrogenase, mitochondrial
Gene: ALDH5A1
Variant information

Variant position:  223
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Cysteine (C) to Tyrosine (Y) at position 223 (C223Y, p.Cys223Tyr).
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:  Change from medium size and polar (C) to large size and aromatic (Y)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Involvement in disease:  Succinic semialdehyde dehydrogenase deficiency (SSADHD) [MIM:271980]: A rare inborn error of 4-aminobutyric acid (GABA) metabolism, which leads to accumulation of 4-hydroxybutyric acid in physiologic fluids of patients. The disease is clinically characterized by developmental delay, hypotonia, mental retardation, ataxia, seizures, hyperkinetic behavior, aggression, and sleep disturbances. {ECO:0000269|PubMed:11243727, ECO:0000269|PubMed:11901270, ECO:0000269|PubMed:14635103}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In SSADHD; 5% of activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  223
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  535
The length of the canonical sequence.

Location on the sequence:   PWNFPSAMITRKVGAALAAG  C TVVVKPAEDTPFSALALAEL
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: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         PWNFPSAMITRKVGAALAAGCTVVVKPAEDTPFSALALAEL

Gorilla                       PWNFPSAMITRKVGAALAAGCTVVVKPAEDTPFSALALAEL

Chimpanzee                    PWNFPSAMITRKVGAALAAGCTVVVKPAEDTPFSALALAEL

Mouse                         PWNFPSAMITRKVGAALAAGCTVVVKPAEDTPYSALALAQL

Rat                           PWNFPSAMITRKVGAALAAGCTVVVKPAEDTPYSALALAQL

Sequence annotation in neighborhood:  
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
Binding site 213 – 213 Substrate
Site 205 – 205 Transition state stabilizer
Alternative sequence 242 – 242 E -> EVNQGFLLDLDPLL. In isoform 2.
Mutagenesis 213 – 213 R -> A. Reduces catalytic activity to less than 15% of wild-type.


Literature citations

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;

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.