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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00480: Variant p.Arg26Gln

Ornithine transcarbamylase, mitochondrial
Gene: OTC
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Variant information Variant position: help 26 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 26 (R26Q, p.Arg26Gln). 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 OTCD. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 26 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 354 The length of the canonical sequence.
Location on the sequence: help RILLNNAAFRNGHNFMVRNF R CGQPLQNKVQLKGRDLLTLK 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                         RILLNNAAFRNGHNFMVRNFRCGQPLQNKVQLKGRDLLTLK

Mouse                         RILLNNAALRKGHTSVVRHFWCGKPVQSQVQLKGRDLLTLK

Rat                           RILLNKAALRKAHTSMVRNFRYGKPVQSQVQLKGRDLLTLK

Bovine                        RTLLNNAALRNGHNFVVRNFRCGQPLQDKVQLKGRDLLTLK

Sheep                         RTLLNNAALRNGHNFVVRNFRCGQPVQDKVQLKGRDLLTLK

Chicken                       KNLYRITKLTQNSKHLPRHFCRGPPNQMNVCLKGRDLLTLQ

Baker's yeast                 ------MSTTASTPSSLRH-----------------LISIK

Fission yeast                 ----------MSFKKFPRH-----------------LLSIR
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
Transit peptide 1 – 32 Mitochondrion
Mutagenesis 15 – 15 R -> G. Loss of cleavage of the transit peptide and loss of localization to mitochondrial matrix; when associated with G-23 and G-26.
Mutagenesis 23 – 23 R -> G. Loss of cleavage of the transit peptide and loss of localization to mitochondrial matrix; when associated with G-15 and G-26.
Mutagenesis 26 – 26 R -> G. Loss of cleavage of the transit peptide and loss of localization to mitochondrial matrix; when associated with G-15 and G-23.



Literature citations
Scanning detection of mutations in human ornithine transcarbamoylase by chemical mismatch cleavage.
Grompe M.; Muzny D.M.; Caskey C.T.;
Proc. Natl. Acad. Sci. U.S.A. 86:5888-5892(1989)
Cited for: VARIANTS OTCD GLN-26; PRO-45 AND GLU-216; VARIANT ARG-46;
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.