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UniProtKB/Swiss-Prot P51688: Variant p.Ser298Pro

N-sulphoglucosamine sulphohydrolase
Gene: SGSH
Variant information

Variant position:  298
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 Serine (S) to Proline (P) at position 298 (S298P, p.Ser298Pro).
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 small size and polar (S) to medium size and hydrophobic (P)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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:  In MPS3A; associated with a slowly progressive clinical phenotype; rapidly degraded but small amounts of the mutant protein are correctly transported to the lysosome; low but significant residual enzymatic activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  298
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  502
The length of the canonical sequence.

Location on the sequence:   FPSGRTNLYWPGTAEPLLVS  S PEHPKRWGQVSEAYVSLLDL
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.

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 21 – 502 N-sulphoglucosamine sulphohydrolase


Literature citations

Mutational analysis of Sanfilippo syndrome type A (MPS IIIA): identification of 13 novel mutations.
Beesley C.E.; Young E.P.; Vellodi A.; Winchester B.G.;
J. Med. Genet. 37:704-707(2000)
Cited for: VARIANTS MPS3A GLY-32; TRP-66; CYS-74; PRO-79; TYR-84; ARG-122; TRP-150; ASN-235; HIS-245; ASN-273; PRO-298; SER-322; LYS-355; HIS-374; GLN-ARG-381 INS; TRP-433; 436-TRP--LEU-438 DEL AND PHE-486; VARIANT HIS-456;

The mutation p.Ser298Pro in the sulphamidase gene (SGSH) is associated with a slowly progressive clinical phenotype in mucopolysaccharidosis type IIIA (Sanfilippo A syndrome).
Meyer A.; Kossow K.; Gal A.; Steglich C.; Muehlhausen C.; Ullrich K.; Braulke T.; Muschol N.;
Hum. Mutat. 29:770-770(2008)
Cited for: VARIANTS MPS3A GLU-32; CYS-74; HIS-245; ALA-251 AND PRO-298; ASSOCIATION OF VARIANT MPS3A PRO-298 WITH SLOWLY PROGRESSIVE PHENOTYPE;

Residual activity and proteasomal degradation of p.Ser298Pro sulfamidase identified in patients with a mild clinical phenotype of Sanfilippo A syndrome.
Muschol N.; Pohl S.; Meyer A.; Gal A.; Ullrich K.; Braulke T.;
Am. J. Med. Genet. A 155A:1634-1639(2011)
Cited for: VARIANTS MPS3A TRP-66; CYS-74; HIS-245; ALA-251 AND PRO-298; CHARACTERIZATION OF VARIANT MPS3A PRO-298;

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.