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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P00480: Variant p.Arg277Trp

Ornithine transcarbamylase, mitochondrial
Gene: OTC
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Variant information Variant position: help 277 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 277 (R277W, p.Arg277Trp). 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 OTCD; late onset. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 277 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 GNVLITDTWISMGQEEEKKK R LQAFQGYQVTMKTAKVAASD 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                         GNVLITDTWISMGQEEEKKKRLQAFQGYQVTMKTAKVAASD

Mouse                         GNVLITDTWISMGQEDEKKKRLQAFQGYQVTMKTAKVAASD

Rat                           GNVLITDTWISMGQEDEKKKRLQAFQGYQVTMKTAKVAASD

Bovine                        GNVLITDTWISMGQEEEKKKRLQAFQGYQVTMKTAKVAAPD

Sheep                         GNVLITDTWISMGQEEEKKKRLQAFQGYQVTMKTAKVAAPD

Chicken                       ANVLVTDTWISMGQEEEKRRRLKAFQGYQITMQTVQSAASN

Baker's yeast                 ANILVTDTFVSMGEEFAKQAKLKQFKGFQINQELVSVADPN

Fission yeast                 ADIVVTDTWISMGQEAEKEQRLKQFTGFQVTGEIMKLAKPS
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 33 – 354 Ornithine transcarbamylase, mitochondrial
Binding site 263 – 263
Binding site 267 – 267
Binding site 268 – 268
Modified residue 274 – 274 N6-succinyllysine
Modified residue 289 – 289 N6-succinyllysine
Modified residue 292 – 292 N6-acetyllysine; alternate
Modified residue 292 – 292 N6-succinyllysine; alternate
Helix 274 – 280



Literature citations
Use of denaturing gradient gel electrophoresis for detection of mutation and prospective diagnosis in late onset ornithine transcarbamylase deficiency.
Finkelstein J.E.; Francomano C.A.; Brusilow S.W.; Traystman M.D.;
Genomics 7:167-172(1990)
Cited for: VARIANT OTCD TRP-277; Expression, purification and kinetic characterization of wild-type human ornithine transcarbamylase and a recurrent mutant that produces 'late onset' hyperammonaemia.
Morizono H.; Tuchman M.; Rajagopal B.S.; McCann M.T.; Listrom C.D.; Yuan X.; Venugopal D.; Barany G.; Allewell N.M.;
Biochem. J. 322:625-631(1997)
Cited for: CHARACTERIZATION OF VARIANT OTCD TRP-277;
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.