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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P16278: Variant p.His281Tyr

Beta-galactosidase
Gene: GLB1
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Variant information Variant position: help 281 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 Histidine (H) to Tyrosine (Y) at position 281 (H281Y, p.His281Tyr). 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 medium size and polar (H) to large size and aromatic (Y) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 2 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 GM1G1 and GM1G3. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 281 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 677 The length of the canonical sequence.
Location on the sequence: help KGPLINSEFYTGWLDHWGQP H STIKTEAVASSLYDILARGA 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                         KGPLINSEFYTGWLDHWGQPHSTIKTEAVASSLYDILARGA

                              KGPLVNSEFYTGWLDHWGQPHSTVRTEVVASSLHDILAHGA

Mouse                         KGPLINSEFYTGWLDHWGKPHSTVKTKTLATSLYNLLARGA

Bovine                        TGPLVNSEFYTGWLDHWGQRHSTVSSKAVAFTLHDMLALGA

Cat                           RGPLVNSEFYTGWLDHWGQPHSRVRTEVVASSLHDVLAHGA
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 29 – 677 Beta-galactosidase
Active site 268 – 268 Nucleophile



Literature citations
Mutation analyses in 17 patients with deficiency in acid beta-galactosidase: three novel point mutations and high correlation of mutation W273L with Morquio disease type B.
Paschke E.; Milos I.; Kreimer-Erlacher H.; Hoefler G.; Beck M.; Hoeltzenbein M.; Kleijer W.; Levade T.; Michelakakis H.; Radeva B.;
Hum. Genet. 109:159-166(2001)
Cited for: VARIANTS MPS4B LEU-273; PRO-408 AND ALA-500; VARIANTS GM1G3 MET-82; ASP-270 AND TYR-281; VARIANT LEU-10; Role of beta-galactosidase and elastin binding protein in lysosomal and nonlysosomal complexes of patients with GM1-gangliosidosis.
Caciotti A.; Donati M.A.; Boneh A.; d'Azzo A.; Federico A.; Parini R.; Antuzzi D.; Bardelli T.; Nosi D.; Kimonis V.; Zammarchi E.; Morrone A.;
Hum. Mutat. 25:285-292(2005)
Cited for: VARIANTS GM1G1 HIS-59; CYS-59; CYS-208; MET-239; TYR-281; HIS-482; ASP-579; ASN-591 AND CYS-591; VARIANT GM1G2 HIS-201; VARIANT GM1G3 CYS-521; CHARACTERIZATION OF VARIANTS GM1G1 HIS-59; CYS-59; CYS-208; MET-239; TYR-281; HIS-482; ASP-579; ASN-591 AND CYS-591; CHARACTERIZATION OF VARIANT GM1G2 HIS-201; CHARACTERIZATION OF VARIANT GM1G3 CYS-521; FUNCTION; CATALYTIC ACTIVITY;
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.