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UniProtKB/Swiss-Prot P12268: Variant p.Leu263Phe

Inosine-5'-monophosphate dehydrogenase 2
Gene: IMPDH2
Variant information

Variant position:  263
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LB/B
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 Leucine (L) to Phenylalanine (F) at position 263 (L263F, p.Leu263Phe).
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 medium size and hydrophobic (L) to large size and aromatic (F)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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

Polymorphism:  Genetic variants in the IMPDH2 gene are responsible for the large inter-individual variability in enzyme activity and may influence immunosuppressive efficacy and side effects in transplant recipients receiving mycophenolic acid [MIM:617995].
Additional information on the polymorphism described.

Variant description:  Results in 10-fold decrease of enzymatic activity.
Any additional useful information about the variant.

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



Sequence information

Variant position:  263
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  514
The length of the canonical sequence.

Location on the sequence:   QLLCGAAIGTHEDDKYRLDL  L AQAGVDVVVLDSSQGNSIFQ
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                         QLLCGAAIGTHEDDKYRLDLLAQAGVDVVVLDSSQGNSIFQ

Mouse                         QLLCGAAIGTHEDDKYRLDLLALAGVDVVVLDSSQGNSIFQ

Rat                           QLLCGAAIGTHEDDKYRLDLLALAGVDVVVLDSSQGNSIFQ

Bovine                        QLLCGAAIGTHEDDKYRLDLLSQAGVDVVVLDSSQGNSIFQ

Xenopus tropicalis            QLLCGAAIGTHEDDKYRLDLLVQAGVDAVVLDSSQGNSIFQ

Zebrafish                     QLLCGAAIGTHNDDKYRLDLLAQAGVDVVVLDSSQGNSIFQ

Baker's yeast                 QLLCGASIGTMDADKERLRLLVKAGLDVVILDSSQGNSIFE

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 2 – 514 Inosine-5'-monophosphate dehydrogenase 2
Helix 256 – 265


Literature citations

A novel variant L263F in human inosine 5'-monophosphate dehydrogenase 2 is associated with diminished enzyme activity.
Wang J.; Zeevi A.; Webber S.; Girnita D.M.; Addonizio L.; Selby R.; Hutchinson I.V.; Burckart G.J.;
Pharmacogenet. Genomics 17:283-290(2007)
Cited for: POLYMORPHISM; VARIANT PHE-263;

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.