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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9HCC0: Variant p.Arg268Thr

Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial
Gene: MCCC2
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Variant information Variant position: help 268 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 Threonine (T) at position 268 (R268T, p.Arg268Thr). 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 (T) 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 MCC2D; asymptomatic form. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 268 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 563 The length of the canonical sequence.
Location on the sequence: help KAATGEEVSAEDLGGADLHC R KSGVSDHWALDDHHALHLTR 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                         KAATGEEVSAEDLGGADLHCRKSGVSDHWALDDHHALHLTR

Mouse                         KAATGEEVSAEDLGGADLHCRKSGVTDHYALDDHHALHLTR

Rat                           KAATGEEVSAEDLGGADLHCRRSGVTDHYALDDHHALHLTR

Caenorhabditis elegans        KAATGEEISAEELGGADLHCGESGVTDYYAHNDKHALYLAR

Drosophila                    KAATGEEVSAEDLGGADLHCKTSGVTDHYALDDEHALYLAR

Slime mold                    KAATGEIVTSEELGGADLHCRTSGVTDHYARDDAEAIAITR
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 23 – 563 Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial
Domain 49 – 306 CoA carboxyltransferase N-terminal
Region 49 – 555 Carboxyltransferase



Literature citations
Cloning of the human MCCA and MCCB genes and mutations therein reveal the molecular cause of 3-methylcrotonyl-CoA: carboxylase deficiency.
Holzinger A.; Roeschinger W.; Lagler F.; Mayerhofer P.U.; Lichtner P.; Kattenfeld T.; Thuy L.P.; Nyhan W.L.; Koch H.G.; Muntau A.C.; Roscher A.A.;
Hum. Mol. Genet. 10:1299-1306(2001)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1); VARIANT MCC2D THR-268; 3-Methylcrotonyl-CoA carboxylase deficiency: mutation analysis in 28 probands, 9 symptomatic and 19 detected by newborn screening.
Dantas M.F.; Suormala T.; Randolph A.; Coelho D.; Fowler B.; Valle D.; Baumgartner M.R.;
Hum. Mutat. 26:164-174(2005)
Cited for: VARIANTS MCC2D GLN-99; TRP-155; GLN-155; TYR-190; THR-268; ARG-282; ARG-310; PHE-375 AND VAL-456; CHARACTERIZATION OF VARIANTS TYR-190 AND ARG-352;
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.