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UniProtKB/Swiss-Prot P16442: Variant p.Gly230Arg

Histo-blood group ABO system transferase
Gene: ABO
Variant information

Variant position:  230
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  US
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 Glycine (G) to Arginine (R) at position 230 (G230R, p.Gly230Arg).
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

Variant description:  In group B transferase; lower-level protein expression and intracellular cytoplasmic mislocation.
Any additional useful information about the variant.

Sequence information

Variant position:  230
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  354
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 1 – 354 Histo-blood group ABO system transferase
Chain 54 – 354 Fucosylglycoprotein alpha-N-acetylgalactosaminyltransferase soluble form
Topological domain 54 – 354 Lumenal
Binding site 211 – 211
Binding site 213 – 213
Binding site 233 – 233
Binding site 245 – 245
Mutagenesis 214 – 214 M -> TV. Alters substrate specificity so that both UDP-N-acetyl-D-galactosamine and UDP-galactose are utilized.
Mutagenesis 234 – 234 P -> S. Alters substrate specificity of group B transferase.
Beta strand 226 – 232

Literature citations

Aberrant intracellular trafficking of a variant B glycosyltransferase.
Seltsam A.; Gruger D.; Just B.; Figueiredo C.; Gupta C.D.; Deluca D.S.; Blasczyk R.;
Transfusion 48:1898-1905(2008)

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.