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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P50747: Variant p.Leu237Pro

Biotin--protein ligase
Gene: HLCS
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Variant information Variant position: help 237 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 237 (L237P, p.Leu237Pro). 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 HLCS deficiency; has normal or low KM values for biotin (non-KM mutant). Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 237 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 726 The length of the canonical sequence.
Location on the sequence: help LVIATRESIPEDLYQKFMAY L SQGGKVLGLSSSFTFGGFQV 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                         LVIATRESIPEDLYQKFMAYLSQGGKVLGLSSSFTFGGFQV

Mouse                         LVIASRDPIPKDIQHKFMAYLSQGGKVLGLSSPFTLGGFRV

Baker's yeast                 EVSGSRD-------LRFFP---------GTSRGPAYNGFQY

Fission yeast                 NVVGKRK-------LQFFP---------GTCAGPTFPGFTY
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 1 – 726 Biotin--protein ligase



Literature citations
Isolation and characterization of mutations in the human holocarboxylase synthetase cDNA.
Suzuki Y.; Aoki Y.; Ishida Y.; Chiba Y.; Iwamatsu A.; Kishino T.; Niikawa N.; Matsubara Y.; Narisawa K.;
Nat. Genet. 8:122-128(1994)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANT HLCS DEFICIENCY PRO-237; FUNCTION; SUBUNIT; SUBCELLULAR LOCATION; TISSUE SPECIFICITY; Structure of human holocarboxylase synthetase gene and mutation spectrum of holocarboxylase synthetase deficiency.
Yang X.; Aoki Y.; Li X.; Sakamoto O.; Hiratsuka M.; Kure S.; Taheri S.; Christensen E.; Inui K.; Kubota M.; Ohira M.; Ohki M.; Kudoh J.; Kawasaki K.; Shibuya K.; Shintani A.; Asakawa S.; Minoshima S.; Shimizu N.; Narisawa K.; Matsubara Y.; Suzuki Y.;
Hum. Genet. 109:526-534(2001)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS HLCS DEFICIENCY ASP-42; PRO-237; GLU-333; SER-360; CYS-456; SER-470; TRP-508; GLY-547; MET-550; SER-581; THR-610 DEL AND TYR-634; CHARACTERIZATION OF VARIANTS HLCS DEFICIENCY ASP-42; SER-360; CYS-456; SER-470; GLY-547 AND TYR-634; Molecular analysis of holocarboxylase synthetase deficiency: a missense mutation and a single base deletion are predominant in Japanese patients.
Aoki Y.; Suzuki Y.; Sakamoto O.; Li X.; Takahashi K.; Ohtake A.; Sakuta R.; Ohura T.; Miyabayashi S.; Narisawa K.;
Biochim. Biophys. Acta 1272:168-174(1995)
Cited for: VARIANT HLCS DEFICIENCY PRO-237; Characterization of mutant holocarboxylase synthetase (HCS): a Km for biotin was not elevated in a patient with HCS deficiency.
Aoki Y.; Suzuki Y.; Li X.; Sakamoto O.; Chikaoka H.; Takita S.; Narisawa K.;
Pediatr. Res. 42:849-854(1997)
Cited for: VARIANTS HLCS DEFICIENCY PRO-237 AND MET-550; Relationship between kinetic properties of mutant enzyme and biochemical and clinical responsiveness to biotin in holocarboxylase synthetase deficiency.
Sakamoto O.; Suzuki Y.; Li X.; Aoki Y.; Hiratsuka M.; Suormala T.; Baumgartner E.R.; Gibson K.M.; Narisawa K.;
Pediatr. Res. 46:671-676(1999)
Cited for: VARIANTS HLCS DEFICIENCY PRO-183; ARG-216; PRO-237; GLU-333; ASP-363; SER-581 AND THR-610 DEL; CHARACTERIZATION OF VARIANTS HLCS DEFICIENCY PRO-183; ARG-216; PRO-237; GLU-333; ASP-363; SER-581 AND THR-610 DEL; FUNCTION; CATALYTIC ACTIVITY; BIOPHYSICOCHEMICAL PROPERTIES;
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.