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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot A4D126: Variant p.Gly54Ala

D-ribitol-5-phosphate cytidylyltransferase
Gene: CRPPA
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Variant information Variant position: help 54 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 Glycine (G) to Alanine (A) at position 54 (G54A, p.Gly54Ala). 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 glycine (G) to small size and hydrophobic (A) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 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 MDDGC7; decreased alpha-dystroglycan glycosylation. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 54 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 451 The length of the canonical sequence.
Location on the sequence: help SVAGTEPGRHPQAVAAVLPA G GCGERMGVPTPKQFCPILER 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                         SVAGTEPGR-----------HPQA------VAAVLPAGGCGERMGVPTPKQFCPILER

Mouse                         SVAGAEPGN-----------RPGT------VAAVLPAGGCG

Rat                           SAAGAEPGS-----------RIGT------VAAVLPAGGCG

Bovine                        SRFGAEAGC-----------RASA------VAAVLPAGGSG

Xenopus tropicalis            ---MDDAAK-----------DLGR------CAVVLPAGGCG

Zebrafish                     TQRPLDPGCLLPQDAERSADQPGRAVVDFPVAAVLPAGGSG
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 1 – 451 D-ribitol-5-phosphate cytidylyltransferase
Site 59 – 59 Transition state stabilizer
Site 66 – 66 Transition state stabilizer



Literature citations
Limb-girdle muscular dystrophy with alpha-dystroglycan deficiency and mutations in the ISPD gene.
Tasca G.; Moro F.; Aiello C.; Cassandrini D.; Fiorillo C.; Bertini E.; Bruno C.; Santorelli F.M.; Ricci E.;
Neurology 80:963-965(2013)
Cited for: VARIANTS MDDGC7 ALA-54 AND VAL-372 DEL; INVOLVEMENT IN MDDGC7; CHARACTERIZATION OF VARIANTS MDDGC7 ALA-54 AND VAL-372 DEL;
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.