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UniProtKB/Swiss-Prot O75752: Variant p.Gly271Arg

UDP-GalNAc:beta-1,3-N-acetylgalactosaminyltransferase 1
Gene: B3GALNT1
Variant information

Variant position:  271
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Polymorphism
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Glycine (G) to Arginine (R) at position 271 (G271R, p.Gly271Arg).
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 glycine (G) to large size and basic (R)
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

Polymorphism:  Genetic variation in B3GALNT1 is responsible for the blood group P1PK system [MIM:111400]. Different combinations or absence of the P1PK antigens define 5 different phenotypes: P1, P2, P1(k), P2(k), and P. The P1(k) and P2(k) phenotypes are rare and characterized by lack of the P antigen.B3GALNT1 activity is responsible for the globoside blood group system (GLOB), which is defined by the P antigen [MIM:615021]. -
Additional information on the polymorphism described.

Variant description:  Associated with P1(k) phenotype.
Any additional useful information about the variant.

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



Sequence information

Variant position:  271
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  331
The length of the canonical sequence.

Location on the sequence:   PRIYEMMGHVKPIKFEDVYV  G ICLNLLKVNIHIPEDTNLFF
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                         PRIYEMMGHVKPIKFEDVYVGICLNLLKVNIHIPEDTNLFF

Mouse                         PRVYEMMSHVKPIKFEDVYVGICLNLLKVDIHIPEDTNLFF

Rat                           PKIYEMMGHVKPIKFEDVYVGICLNLLKVDIHIPEDTNLFF

Pig                           PRIYEMMSHVKPIKFEDVYVGICLNLLKVDIHIPEDTNLFF

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 1 – 331 UDP-GalNAc:beta-1,3-N-acetylgalactosaminyltransferase 1
Topological domain 44 – 331 Lumenal


Literature citations

Molecular basis of the globoside-deficient P(k) blood group phenotype. Identification of four inactivating mutations in the UDP-N-acetylgalactosamine: globotriaosylceramide 3-beta-N-acetylgalactosaminyltransferase gene.
Hellberg A.; Poole J.; Olsson M.L.;
J. Biol. Chem. 277:29455-29459(2002)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS ALA-266 AND ARG-271; POLYMORPHISM;

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.