Home  |  Contact

UniProtKB/Swiss-Prot P24752: Variant p.Asn93Ser

Acetyl-CoA acetyltransferase, mitochondrial
Gene: ACAT1
Variant information

Variant position:  93
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 Asparagine (N) to Serine (S) at position 93 (N93S, p.Asn93Ser).
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 (N) to small size and polar (S)
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:  3-ketothiolase deficiency (3KTD) [MIM:203750]: An autosomal recessive inborn error of isoleucine catabolism characterized by intermittent ketoacidotic attacks associated with unconsciousness. Some patients die during an attack or are mentally retarded. Urinary excretion of 2-methyl-3-hydroxybutyric acid, 2-methylacetoacetic acid, triglylglycine, butanone is increased. It seems likely that the severity of this disease correlates better with the environmental or acquired factors than with the ACAT1 genotype. {ECO:0000269|PubMed:1346617, ECO:0000269|PubMed:1715688, ECO:0000269|PubMed:7728148, ECO:0000269|PubMed:9744475}. 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 3KTD; decreased acetyl-CoA C-acyltransferase activity; less than 10% of the degradative/thiolase activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  93
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  427
The length of the canonical sequence.

Location on the sequence:   QGAIEKAGIPKEEVKEAYMG  N VLQGGEGQAPTRQAVLGAGL
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                         QGAIEKA-GI-PKEEVKEAYMGNVLQGGEGQAPTRQAVLGAGL

Mouse                         QGAIEKA-GI-PKEEVKEVYMGNVIQGGEGQAPTRQATLGA

Rat                           QGAIEKA-GI-PKEEVKEVYMGNVIQGGEGQAPTRQATLGA

Bovine                        QGAIEKA-GI-PKEEVKEAYMGNVLQGGEGQAPTRQAVLGA

Xenopus tropicalis            KAAVERA-GI-PGDEVKEVYMGNVLQAGQGQAPSRQATLGA

Zebrafish                     KGAIDKA-GI-PVEEVKEVYMGNVLQAGEGQAPTRQALLGA

Baker's yeast                 KGALAKVPELDASKDFDEIIFGNVLSANLGQAPARQVALAA

Fission yeast                 KGALERV-NIKPS-DVDEVFMGNVVSANLGQNPARQCALGA

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 34 – 427 Acetyl-CoA acetyltransferase, mitochondrial
Modified residue 78 – 78 N6-succinyllysine


Literature citations

Characterization of N93S, I312T, and A333P missense mutations in two Japanese families with mitochondrial acetoacetyl-CoA thiolase deficiency.
Fukao T.; Nakamura H.; Song X.-Q.; Nakamura K.; Orii K.E.; Kohno Y.; Kano M.; Yamaguchi S.; Hashimoto T.; Orii T.; Kondo N.;
Hum. Mutat. 12:245-254(1998)
Cited for: VARIANTS 3KTD SER-93; THR-312 AND PRO-333; CHARACTERIZATION OF VARIANTS 3KTD SER-93; THR-312 AND PRO-333; FUNCTION; CATALYTIC ACTIVITY; PATHWAY;

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.