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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O00337: Variant p.Arg561Gln

Sodium/nucleoside cotransporter 1
Gene: SLC28A1
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Variant information Variant position: help 561 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 Arginine (R) to Glutamine (Q) at position 561 (R561Q, p.Arg561Gln). 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 large size and basic (R) to medium size and polar (Q) 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 URCTU; changed N-glycosylation; increased protein degradation; affects urinary excretion of uridine and cytidine. Any additional useful information about the variant.


Sequence information Variant position: help 561 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 649 The length of the canonical sequence.
Location on the sequence: help FANFSSIGIMLGGLTSMVPQ R KSDFSQIVLRALFTGACVSL 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                         FANFSSIGIMLGGLTSMVPQRKSDFSQIVLRALFTGACVSL

Mouse                         FANFSSIGIMLGGLTSMVPQRRSDFSQIVLRALITGAFVSL

Rat                           FANFSSIGIMLGGLTSLVPQRRSDFSQIVLRALITGAFVSL

Pig                           FANFSSIGIMLGGLTSMVPQRKGDFSQIVLRALCTGACVSL

Rabbit                        FANLSSIGITLGGLTSMVPHRKSDLSKVVIRALFTGSCVSF
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 – 649 Sodium/nucleoside cotransporter 1
Topological domain 559 – 569 Cytoplasmic
Alternative sequence 176 – 649 Missing. In isoform 2.
Mutagenesis 546 – 546 S -> ACRT. No effect on localization to the apical plasma membrane. Loss of pyrimidine- and adenosine-specific:sodium symporter activity. Probably due to sodium uncoupling in the nucleoside translocation cycle.
Mutagenesis 546 – 546 Missing. Loss of pyrimidine- and adenosine-specific:sodium symporter activity.



Literature citations
Deficiency of perforin and hCNT1, a novel inborn error of pyrimidine metabolism, associated with a rapidly developing lethal phenotype due to multi-organ failure.
Perez-Torras S.; Mata-Ventosa A.; Droegemoeller B.; Tarailo-Graovac M.; Meijer J.; Meinsma R.; van Cruchten A.G.; Kulik W.; Viel-Oliva A.; Bidon-Chanal A.; Ross C.J.; Wassermann W.W.; van Karnebeek C.D.M.; Pastor-Anglada M.; van Kuilenburg A.B.P.;
Biochim. Biophys. Acta 1865:1182-1191(2019)
Cited for: INVOLVEMENT IN URCTU; FUNCTION; TRANSPORTER ACTIVITY; GLYCOSYLATION; VARIANT URCTU GLN-561; VARIANT CYS-510; CHARACTERIZATION OF VARIANT URCTU GLN-561; CHARACTERIZATION OF VARIANT CYS-510;
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.