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UniProtKB/Swiss-Prot Q68CP4: Variant p.Leu141Pro

Heparan-alpha-glucosaminide N-acetyltransferase
Gene: HGSNAT
Variant information

Variant position:  141
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 Leucine (L) to Proline (P) at position 141 (L141P, p.Leu141Pro).
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:  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:  -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:  In MPS3C; shows practically no enzyme activity.
Any additional useful information about the variant.



Sequence information

Variant position:  141
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  663
The length of the canonical sequence.

Location on the sequence:   AGKPSAAAASVSTQHGSILQ  L NDTLEEKEVCRLEYRFGEFG
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                         AGKPSAAAASVSTQHGSILQLNDTLEEKEVCRLEYRFGEFG

Mouse                         PAKPSVAPVSVSTQHGSILQVNSTSEERAACRLEYKFGEFG

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 1 – 663 Heparan-alpha-glucosaminide N-acetyltransferase
Topological domain 1 – 190 Lumenal, vesicle
Glycosylation 142 – 142 N-linked (GlcNAc...) asparagine
Mutagenesis 151 – 151 C -> S. Loss of intralysosomal proteolytic cleavage and enzymatic activity. Reduced oligomer formation.


Literature citations

Molecular analysis of Sanfilippo syndrome type C in Spain: seven novel HGSNAT mutations and characterization of the mutant alleles.
Canals I.; Elalaoui S.C.; Pineda M.; Delgadillo V.; Szlago M.; Jaouad I.C.; Sefiani A.; Chabas A.; Coll M.J.; Grinberg D.; Vilageliu L.;
Clin. Genet. 80:367-374(2011)
Cited for: VARIANTS MPS3C VAL-82; PRO-141; VAL-452 AND PRO-473; VARIANT GLN-265; CHARACTERIZATION OF VARIANTS MPS3C VAL-82; PRO-141; CYS-372; VAL-452; PRO-473 AND PHE-546; CHARACTERIZATION OF VARIANT GLN-265;

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.