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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P16278: Variant p.Thr420Lys

Beta-galactosidase
Gene: GLB1
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Variant information Variant position: help 420 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 Threonine (T) to Lysine (K) at position 420 (T420K, p.Thr420Lys). 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 (T) to large size and basic (K) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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: help In GM1G3; decrease in galactosidase activity. Any additional useful information about the variant.


Sequence information Variant position: help 420 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 SLYPLTFIQVKQHYGFVLYR T TLPQDCSNPAPLSSPLNGVH 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                         SLYPLTFIQVKQHYGFVLYRTTLPQDCSNPAPL-SSPLNGVH

                              SLYPLTFIQVKQYFGFVMYRTTLPQDCSDPTPL-SSPLSGV

Mouse                         SLYPLTFTQVKQYFGYVLYRTTLPQDCSNPKPIFSSPFNGV

Bovine                        SVYPLTFIDVKQYFGFVLYRTMLPEDCSDPTPL-SSPLSGV

Cat                           SLYPLTFIQVKQYFGFVLYRTTLPQDCSNPTPL-SSPLNGV
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
Beta strand 413 – 421



Literature citations
Twenty-one novel mutations in the GLB1 gene identified in a large group of GM1-gangliosidosis and Morquio B patients: possible common origin for the prevalent p.R59H mutation among Gypsies.
Santamaria R.; Chabas A.; Coll M.J.; Miranda C.S.; Vilageliu L.; Grinberg D.;
Hum. Mutat. 27:1060-1060(2006)
Cited for: VARIANTS GM1G1 CYS-59; HIS-59; SER-136; VAL-151; PRO-173; CYS-199; ASP-272; ASN-346; CYS-347; PRO-420; ARG-422; ASN-441 AND CYS-590; VARIANT GM1G2 SER-264; VARIANTS GM1G3 HIS-201 AND LYS-420; VARIANTS MPS4B CYS-83; CYS-444; SER-494 AND ALA-500; VARIANTS PHE-436; CYS-521 AND GLY-532; Expression and characterization of 14 GLB1 mutant alleles found in GM1-gangliosidosis and Morquio B patients.
Santamaria R.; Chabas A.; Callahan J.W.; Grinberg D.; Vilageliu L.;
J. Lipid Res. 48:2275-2282(2007)
Cited for: CHARACTERIZATION OF VARIANTS GM1G1 HIS-59; SER-162; PRO-173; HIS-201; PRO-420; ASN-441 AND CYS-590; CHARACTERIZATION OF VARIANTS MPS4B CYS-83; CYS-444 AND SER-494; CHARACTERIZATION OF VARIANT GM1G3 LYS-420 AND CYS-521; CHARACTERIZATION OF VARIANT GLY-532;
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.