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UniProtKB/Swiss-Prot P35914: Variant p.His233Arg

Hydroxymethylglutaryl-CoA lyase, mitochondrial
Gene: HMGCL
Variant information

Variant position:  233
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Histidine (H) to Arginine (R) at position 233 (H233R, p.His233Arg).
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 (H) to large size and basic (R)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  0
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:  In HMGCLD; loss of activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  233
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  325
The length of the canonical sequence.

Location on the sequence:   IMKDMLSAVMQEVPLAALAV  H CHDTYGQALANTLMALQMGV
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                         IMKDMLSAVMQEVPLAALAVHCHDTYGQALANTLMALQMGV

Mouse                         LMKDMLTAVMHEVPVTALAVHCHDTYGQALANTLVALQMGV

Rat                           LMKDMLTAVLHEVPVAALAVHCHDTYGQALANTLVALQMGV

Bovine                        AMKDMLSAVLQEVPVTALAVHCHDTYGQALANTLTALQMGV

Chicken                       SMKEMLAAVMKEVPVGALAVHCHDTYGQALANILVALQMGV

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 28 – 325 Hydroxymethylglutaryl-CoA lyase, mitochondrial
Domain 33 – 300 Pyruvate carboxyltransferase
Metal binding 233 – 233 Divalent metal cation
Metal binding 235 – 235 Divalent metal cation
Alternative sequence 188 – 250 Missing. In isoform 3.
Mutagenesis 233 – 233 H -> A. Loss of activity, and reduced proton exchange rate.
Beta strand 230 – 235


Literature citations

Modeling of a mutation responsible for human 3-hydroxy-3-methylglutaryl-CoA lyase deficiency implicates histidine-233 as an active site residue.
Roberts J.; Mitchell G.A.; Miziorko H.M.;
J. Biol. Chem. 271:24604-24609(1996)
Cited for: VARIANT HMGCLD ARG-233;

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;

Ten novel HMGCL mutations in 24 patients of different origin with 3-hydroxy-3-methyl-glutaric aciduria.
Menao S.; Lopez-Vinas E.; Mir C.; Puisac B.; Gratacos E.; Arnedo M.; Carrasco P.; Moreno S.; Ramos M.; Gil M.C.; Pie A.; Ribes A.; Perez-Cerda C.; Ugarte M.; Clayton P.T.; Korman S.H.; Serra D.; Asins G.; Ramos F.J.; Gomez-Puertas P.; Hegardt F.G.; Casals N.; Pie J.;
Hum. Mutat. 30:E520-E529(2009)
Cited for: VARIANTS HMGCLD LYS-37; GLY-42; PHE-142; TYR-174; SER-192; PHE-200 AND ARG-233; CHARACTERIZATION OF VARIANTS HMGCLD LYS-37; PHE-142; TYR-174; SER-192 AND PHE-200;

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.