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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35914: Variant p.Arg41Gln

Hydroxymethylglutaryl-CoA lyase, mitochondrial
Gene: HMGCL
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Variant information Variant position: help 41 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 Arginine (R) to Glutamine (Q) at position 41 (R41Q, p.Arg41Gln). 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 Change from large size and basic (R) to medium size and polar (Q) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 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
Variant description: help In HMGCLD; loss of activity and of proton exchange. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 41 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 VSTSSMGTLPKRVKIVEVGP R DGLQNEKNIVSTPVKIKLID 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                         VSTSSMGTLPKRVKIVEVGPRDGLQNEKNIVSTPVKIKLID

Mouse                         VSTSSMGTLPKQVKIVEVGPRDGLQNEKSIVPTPVKIRLID

Rat                           ASTSSMGTLPKRVKIVEVGPRDGLQNEKSIVPTPVKIKLID

Bovine                        VSTSSVGTFPKQVKIVEVGPRDGLQNEKNIVPTPVKIKLID

Chicken                       -------AFPQRVKVVEVGPRDGLQNEKSVVPTPVKIRLID
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
Binding site 41 – 41
Binding site 42 – 42
Modified residue 48 – 48 N6-acetyllysine; alternate
Modified residue 48 – 48 N6-succinyllysine; alternate
Mutagenesis 37 – 37 E -> D. Normal activity.
Mutagenesis 41 – 41 R -> M. Reduced activity, and loss of proton exchange.
Mutagenesis 42 – 42 D -> AN. Loss of activity, and reduced proton exchange rate.
Turn 39 – 41



Literature citations
HMG CoA lyase deficiency: identification of five causal point mutations in codons 41 and 42, including a frequent Saudi Arabian mutation, R41Q.
Mitchell G.A.; Ozand P.T.; Robert M.-F.; Ashmarina L.; Roberts J.; Gibson K.M.; Wanders R.J.; Wang S.; Chevalier I.; Ploechl E.; Miziorko H.;
Am. J. Hum. Genet. 62:295-300(1998)
Cited for: VARIANTS HMGCLD GLN-41; GLU-42; GLY-42 AND HIS-42; Mutations underlying 3-hydroxy-3-methylglutaryl CoA lyase deficiency in the Saudi population.
Al-Sayed M.; Imtiaz F.; Alsmadi O.A.; Rashed M.S.; Meyer B.F.;
BMC Med. Genet. 7:86-86(2006)
Cited for: VARIANT HMGCLD GLN-41;
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.