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UniProtKB/Swiss-Prot P04062: Variant p.Cys55Ser

Lysosomal acid glucosylceramidase
Gene: GBA
Variant information

Variant position:  55
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 Cysteine (C) to Serine (S) at position 55 (C55S, p.Cys55Ser).
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 (C) to small size and polar (S)
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 GD; neuronopathic and perinatal lethal forms; loss of glucosylceramidase activity.
Any additional useful information about the variant.

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

Sequence information

Variant position:  55
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  536
The length of the canonical sequence.

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.






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.

Chain 40 – 536 Lysosomal acid glucosylceramidase
Glycosylation 58 – 58 N-linked (GlcNAc...) asparagine
Disulfide bond 43 – 55
Alternative sequence 1 – 161 Missing. In isoform 3.
Alternative sequence 1 – 87 Missing. In isoform 4.
Mutagenesis 43 – 43 C -> S. Loss of glucosylceramidase activity.
Mutagenesis 57 – 57 C -> S. Loss of glucosylceramidase activity.
Mutagenesis 62 – 62 C -> S. Loss of glucosylceramidase activity.
Beta strand 54 – 57

Literature citations

Analyses of variant acid beta-glucosidases: effects of Gaucher disease mutations.
Liou B.; Kazimierczuk A.; Zhang M.; Scott C.R.; Hegde R.S.; Grabowski G.A.;
J. Biol. Chem. 281:4242-4253(2006)
Cited for: X-RAY CRYSTALLOGRAPHY (2.5 ANGSTROMS) OF 40-536; CATALYTIC ACTIVITY; PATHWAY; CHARACTERIZATION OF VARIANTS GD SER-55; GLN-87; ASN-118; LEU-161; VAL-162; VAL-166; ASN-200; PHE-213; PHE-224; GLU-232; GLU-237; LEU-298; ILE-303; CYS-343; ILE-362; LYS-365; GLY-381; LYS-388; TRP-392; CYS-402; SER-409; VAL-410; HIS-419; LYS-421; ARG-429; LEU-433; SER-436; ASN-438; HIS-448; VAL-455; PRO-483; PRO-500; CYS-502 AND PRO-502; CHARACTERIZATION OF VARIANT GD2 GLN-159; MUTAGENESIS OF CYS-43; CYS-57 AND CYS-62;

Variant Gaucher disease characterized by dysmorphic features, absence of cardiovascular involvement, laryngospasm, and compound heterozygosity for a novel mutation (D409H/C16S).
Bodamer O.A.F.; Church H.J.; Cooper A.; Wraith J.E.; Scott C.R.; Scaglia F.;
Am. J. Med. Genet. 109:328-331(2002)
Cited for: VARIANTS GD SER-55 AND HIS-448;

Homozygous loss of a cysteine residue in the glucocerebrosidase gene results in Gaucher's disease with a hydropic phenotype.
Church H.J.; Cooper A.; Stewart F.; Thornton C.M.; Wraith J.E.;
Eur. J. Hum. Genet. 12:975-978(2004)
Cited for: VARIANT GD SER-55;

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.