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UniProtKB/Swiss-Prot O43708: Variant p.Val99Met

Maleylacetoacetate isomerase
Gene: GSTZ1
Chromosomal location: 14q24.3
Variant information

Variant position:  99
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 Valine (V) to Methionine (M) at position 99 (V99M, p.Val99Met).
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:  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:  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

Involvement in disease:  Maleylacetoacetate isomerase deficiency (MAAID) [MIM:617596]: An autosomal recessive inborn error of metabolism characterized by mild elevations in succinylacetone in blood and urine, usually identified by newborn screening. Liver function and coagulation are normal. MAAID is a benign disorder. {ECO:0000269|PubMed:27876694}. 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 MAAID; decreased maleylacetoacetate isomerase activity.
Any additional useful information about the variant.



Sequence information

Variant position:  99
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  216
The length of the canonical sequence.

Location on the sequence:   LEEMRPTPRLLPQDPKKRAS  V RMISDLIAGGIQPLQNLSVL
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                         LEEMRPTPRLLPQDPKKRASVRMISDLIAGGIQPLQNLSVL

Mouse                         LEETRPIPRLLPQDPQKRAIVRMISDLIASGIQPLQNLSVL

Rat                           LEETRPIPRLLPQDPQKRAIVRMISDLIASGIQPLQNLSVL

Caenorhabditis elegans        LEETHPDVPLLPKDPIKRAHARAISLLVASGIQPLHNLKVL

Slime mold                    LEETHPENPLMPKGSYERAIARQMMQIIGSDIQPLQNLKVL

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 1 – 216 Maleylacetoacetate isomerase
Domain 92 – 212 GST C-terminal
Binding site 111 – 111 Glutathione
Alternative sequence 73 – 114 Missing. In isoform 3.
Helix 93 – 109


Literature citations

Hypersuccinylacetonaemia and normal liver function in maleylacetoacetate isomerase deficiency.
Yang H.; Al-Hertani W.; Cyr D.; Laframboise R.; Parizeault G.; Wang S.P.; Rossignol F.; Berthier M.T.; Giguere Y.; Waters P.J.; Mitchell G.A.;
J. Med. Genet. 54:241-247(2017)
Cited for: INVOLVEMENT IN MAAID; VARIANTS MAAID 87-ARG--ALA-216 DEL; MET-99 AND VAL-150; CHARACTERIZATION OF VARIANTS MAAID MET-99 AND VAL-150;

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.