Abstract
Heart/muscle type carnitine palmitoyltransferase I (M-CPTI) catalyzes the rate-limiting step of mitochondrial long-chain fatty acid (LCFA) oxidation in muscle and adipose tissue. Three replacements of nucleotides resulting in missense mutations of I66V, S427C, and E531K were observed in the M-CPTI gene of patients showing abnormal fatty acid metabolism. These nucleotide replacements were found to be common single nucleotide polymorphisms (SNPs) of this gene and not specific to patients. The question of whether these missense mutations caused by SNPs alter the functional properties of M-CPTI remains unanswered. Thus, we examined whether these missense mutations are associated with any changes in the enzymatic properties of M-CPTI. None of these mutations was found to cause remarkable alteration of its enzymatic properties. Based on the comparison of amino acid sequences of M-CPTI among different animal species, the roles of these amino acids in the enzyme are discussed.
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This work was supported by a grant-in-aid for scientific research (No. 16790055 to N.Y.) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan. This study was also partly supported by grants to Seiji Yamaguchi from the Ministry of Health, Labor, and Welfare of Japan and the Ministry of Education, Culture, Sports, Science, and Technology, and also by the Program for Promotion of Fundamental Studies in Health Sciences of the National Institute of Biomedical Innovation (NIBIO).
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Yamazaki, N., Matsuo, T., Kurata, M. et al. Substitutions of Three Amino Acids in Human Heart/Muscle Type Carnitine Palmitoyltransferase I Caused by Single Nucleotide Polymorphisms. Biochem Genet 46, 54–63 (2008). https://doi.org/10.1007/s10528-007-9129-3
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DOI: https://doi.org/10.1007/s10528-007-9129-3