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UniProtKB/Swiss-Prot P20839: Variant p.Asn198Lys

Inosine-5'-monophosphate dehydrogenase 1
Gene: IMPDH1
Variant information

Variant position:  198
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Asparagine (N) to Lysine (K) at position 198 (N198K, p.Asn198Lys).
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 polar (N) to large size and basic (K)
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

Variant description:  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:  198
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:   VMTPRIELVVAPAGVTLKEA  N EILQRSKKGKLPIVNDCDEL
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                         VMTPRIELVVAPAGVTLKEANEILQRSKKGKLPIVNDCDEL

Mouse                         VMTPRVELVVAPAGVTLKEANEILQRSKKGKLPIVNDQDEL

Rat                           VMTPRIELVVAPAGVTLKEANEILQRSKKGKLPIVNDQDEL

Bovine                        VMTPRNELVVAPAGVTLKEANEILQRSKKGKLPIVNDRDEL

Xenopus tropicalis            VMTKRDELVVAPAGVTLKEANEILQRSKKGKLPIVNDSDEL

Zebrafish                     SMTKREDLVVAPAGVTLKEANDILQRSKKGKLPIVNDSDEL

Baker's yeast                 VMTK--NPVTGAQGITLSEGNEILKKIKKGRLLVVDEKGNL

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 1
Domain 179 – 237 CBS 2
Turn 195 – 199


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.