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UniProtKB/Swiss-Prot P16278: Variant p.Trp273Leu

Beta-galactosidase
Gene: GLB1
Variant information

Variant position:  273
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 Tryptophan (W) to Leucine (L) at position 273 (W273L, p.Trp273Leu).
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 large size and aromatic (W) to medium size and hydrophobic (L)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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:  In MPS4B; decreased galactosidase activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  273
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  677
The length of the canonical sequence.

Location on the sequence:   LSQRKCEPKGPLINSEFYTG  W LDHWGQPHSTIKTEAVASSL
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                         LSQRKCEPKGPLINSEFYTGWLDHWGQPHSTIKTEAVASSL

                              QIQRKSEPKGPLVNSEFYTGWLDHWGQPHSTVRTEVVASSL

Mouse                         LVQRKFEPKGPLINSEFYTGWLDHWGKPHSTVKTKTLATSL

Bovine                        MLQRKFEPTGPLVNSEFYTGWLDHWGQRHSTVSSKAVAFTL

Cat                           QIQRKSEPRGPLVNSEFYTGWLDHWGQPHSRVRTEVVASSL

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


Literature citations

Human beta-galactosidase gene mutations in morquio B disease.
Oshima A.; Yoshida K.; Shimmoto M.; Fukuhara Y.; Sakuraba H.; Suzuki Y.;
Am. J. Hum. Genet. 49:1091-1093(1991)
Cited for: VARIANTS MPS4B LEU-273; HIS-482 AND CYS-509; VARIANT GM1G1 CYS-494;

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;

Elastogenesis in cultured dermal fibroblasts from patients with lysosomal beta-galactosidase, protective protein/cathepsin A and neuraminidase-1 deficiencies.
Tatano Y.; Takeuchi N.; Kuwahara J.; Sakuraba H.; Takahashi T.; Takada G.; Itoh K.;
J. Med. Invest. 53:103-112(2006)
Cited for: VARIANTS MPS4B LEU-273; HIS-482 AND CYS-509; VARIANTS GM1G1 CYS-201; HIS-201 AND HIS-318;

GM1 gangliosidosis and Morquio B disease: expression analysis of missense mutations affecting the catalytic site of acid beta-galactosidase.
Hofer D.; Paul K.; Fantur K.; Beck M.; Buerger F.; Caillaud C.; Fumic K.; Ledvinova J.; Lugowska A.; Michelakakis H.; Radeva B.; Ramaswami U.; Plecko B.; Paschke E.;
Hum. Mutat. 30:1214-1221(2009)
Cited for: VARIANTS GM1G1 HIS-59; THR-132; ARG-184; ASP-190; CYS-201; HIS-201; MET-239; HIS-255; ILE-329; GLU-332; ASN-346; GLN-442 AND SER-597; VARIANTS GM1G2 GLN-68; ARG-155 AND HIS-333; VARIANTS GM1G3 MET-82; ASP-270 AND GLU-438; VARIANTS MPS4B PHE-149; TYR-198; LEU-273; ALA-397; PRO-408 AND ALA-500; CHARACTERIZATION OF VARIANTS GM1G1 THR-132; ARG-184; ASP-190; CYS-201; HIS-201; HIS-255; ILE-329; GLU-332 AND SER-597; CHARACTERIZATION OF VARIANTS GM1G2 GLN-68; ARG-155 AND HIS-333; CHARACTERIZATION OF VARIANTS GM1G3 ASP-270 AND GLU-438; CHARACTERIZATION OF VARIANTS MPS4B PHE-149; TYR-198; LEU-273; ALA-397; PRO-408 AND ALA-500; CATALYTIC ACTIVITY; FUNCTION;

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.