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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35914: Variant p.Leu263Pro

Hydroxymethylglutaryl-CoA lyase, mitochondrial
Gene: HMGCL
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Variant information Variant position: help 263 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 Leucine (L) to Proline (P) at position 263 (L263P, p.Leu263Pro). 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 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: help -3 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 HMGCLD. Any additional useful information about the variant.


Sequence information Variant position: help 263 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 325 The length of the canonical sequence.
Location on the sequence: help ANTLMALQMGVSVVDSSVAG L GGCPYAQGASGNLATEDLVY 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                         ANTLMALQMGVSVVDSSVAGLGGCPYAQGASGNLATEDLVY

Mouse                         ANTLVALQMGVSVVDSSVAGLGGCPYAKGASGNLATEDLVY

Rat                           ANTLVALQMGVSVVDSSVAGLGGCPYAKGASGNLATEDLVY

Bovine                        ANTLTALQMGVSVMDSSVAGLGGCPYAQGASGNLATEDLVY

Chicken                       ANILVALQMGVSVVDASVAGLGGCPYAQGASGNVATEDLVY
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 28 – 325 Hydroxymethylglutaryl-CoA lyase, mitochondrial
Domain 33 – 300 Pyruvate carboxyltransferase
Active site 266 – 266
Binding site 275 – 275
Mutagenesis 266 – 266 C -> A. Loss of activity.
Mutagenesis 279 – 279 E -> A. Reduced thermal stability, but normal activity.
Mutagenesis 280 – 280 D -> A. Normal activity.



Literature citations
Two missense point mutations in different alleles in the 3-hydroxy-3-methylglutaryl coenzyme A lyase gene produce 3-hydroxy-3-methylglutaric aciduria in a French patient.
Zapater N.; Pie J.; Lloberas J.; Rolland M.O.; Leroux B.; Vidailhet M.; Divry P.; Hegardt F.G.; Casals N.;
Arch. Biochem. Biophys. 358:197-203(1998)
Cited for: VARIANTS HMGCLD ARG-233 AND PRO-263;
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.