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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P20839: Variant p.Arg105Trp

Inosine-5'-monophosphate dehydrogenase 1
Gene: IMPDH1
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Variant information Variant position: help 105 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 Tryptophan (W) at position 105 (R105W, p.Arg105Trp). 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 large size and aromatic (W) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 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 LCA11; does not alter the enzymatic affinity of the corresponding enzyme; alters the affinity and/or the specificity of single-stranded nucleic acid. Any additional useful information about the variant.


Sequence information Variant position: help 105 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 514 The length of the canonical sequence.
Location on the sequence: help MGGIGFIHHNCTPEFQANEV R KVKKFEQGFITDPVVLSPSH 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                         MGGIGFIHHNCTPEFQANEVRKVKKFEQGFITDPVVLSPSH

Mouse                         MGGIGFIHHNCTPEFQANEVRKVKKFEQGFITDPVVLSPSH

Rat                           MGGIGFIHHNCTPEFQANEVRKVKKFEQGFITDPVVLSPSH

Bovine                        MGGIGFIHHNCTPEFQANEVRKVKKFEQGFITDPVVLSPSH

Xenopus tropicalis            MGGIGIIHHNCTPEFQANEVR--KKFEQGFITDPVVMSLNH

Zebrafish                     MGGIGIIHHNCTPEFQANEVRKVKKFEQGFITDPVVMSPRH

Baker's yeast                 LDGIGFIHHNCTPEDQADMVRRVKNYENGFINNPIVISPTT
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 2 – 514 Inosine-5'-monophosphate dehydrogenase 1
Alternative sequence 84 – 108 Missing. In isoform 2.
Alternative sequence 104 – 108 Missing. In isoform 4.
Helix 97 – 108



Literature citations
Spectrum and frequency of mutations in IMPDH1 associated with autosomal dominant retinitis pigmentosa and Leber congenital amaurosis.
Bowne S.J.; Sullivan L.S.; Mortimer S.E.; Hedstrom L.; Zhu J.; Spellicy C.J.; Gire A.I.; Hughbanks-Wheaton D.; Birch D.G.; Lewis R.A.; Heckenlively J.R.; Daiger S.P.;
Invest. Ophthalmol. Vis. Sci. 47:34-42(2006)
Cited for: VARIANTS RP10 MET-116; ASN-226; ILE-268 AND PRO-372; VARIANTS LCA11 TRP-105 AND LYS-198; VARIANTS THR-285 AND ASP-324; CHARACTERIZATION OF VARIANTS RP10 MET-116 AND PRO-372; CHARACTERIZATION OF VARIANTS LCA11 TRP-105 AND LYS-198; CHARACTERIZATION OF VARIANT ASP-324;
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.