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UniProtKB/Swiss-Prot Q5VT66: Variant p.Met268Ile

Mitochondrial amidoxime-reducing component 1
Gene: MTARC1
Variant information

Variant position:  268
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 Methionine (M) to Isoleucine (I) at position 268 (M268I, p.Met268Ile).
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:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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:  No effect on binding of the molybdenum cofactor; no significant effect on catalytic efficiency toward benzamidoxime; no significant effect on affinity for benzamidoxime.
Any additional useful information about the variant.

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



Sequence information

Variant position:  268
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  337
The length of the canonical sequence.

Location on the sequence:   VYAEDSWDELLIGDVELKRV  M ACSRCILTTVDPDTGVMSRK
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                         VYAEDSWDELLIGDVELKRVMACSRCILTTVDPDTGVMSRK

Mouse                         VYAEDSWNEVLIGDVELKRVMACTRCLLTTVDPDTGISDRK

Xenopus laevis                AFAEDDWDDVRLGATRLKRVMACGRCVLTTVNPNSGVITRK

Zebrafish                     AFTEDTWDHIRIGEVELKRVIGCGRCLFTTVDPETGVFSRK

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 – 337 Mitochondrial amidoxime-reducing component 1
Topological domain 41 – 337 Cytoplasmic
Domain 187 – 335 MOSC
Region 210 – 335 Molybdopterin-binding
Metal binding 273 – 273 Molybdenum
Alternative sequence 251 – 251 E -> EVTLCPFGSFLGFDFFFK. In isoform 2 and isoform 3.
Beta strand 262 – 271


Literature citations

Functional characterization of protein variants encoded by non-synonymous SNPs in MARC1 and MARC2 in healthy Caucasians.
Ott G.; Reichmann D.; Boerger C.; Cascorbi I.; Bittner F.; Mendel R.R.; Kunze T.; Clement B.; Havemeyer A.;
Drug Metab. Dispos. 42:718-725(2014)
Cited for: VARIANTS ALA-165; LYS-187; SER-246 AND HIS-247; CHARACTERIZATION OF VARIANTS LEU-96; ALA-165; LYS-187; SER-246; HIS-247 AND ILE-268; BIOPHYSICOCHEMICAL PROPERTIES; COFACTOR;

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.