This fact can be explained by the positive inductive effect of substituents in the tocopherol molecule (three methyl groups in the case of α-tocopherol and two methyl groups in the case of γ-tocopherol).
These are involved in the biosynthesis of purines and pyrimidines, in amino acid interconversions, and for the provision of methyl groups in methylation reactions (Kwon et al., 2008).
These conformational states were found by carrying out torsional angle analysis of the methyl groups in the methylated lysine residues.
This observation indicates that the methyl groups in the methylated lysine residue fluctuate about two or three conformations depending on the number of methyl groups.
All methylation assays monitored incorporation of tritiated methyl groups in to DNA by using a modified ion-exchange filter binding assay [23].
DNA methylation is characterized by the addition of methyl groups in cytosines within CpG islands.
An important feature of the methylation of cytosine lies in its ability to be copied, so that methyl groups in a dividing cell's DNA will result in methyl groups in the same positions in the DNA of both daughter cells.
Yang, D., Zheng, Y., Liu, D. & Wyss, D.F. Sequence-specific assignments of methyl groups in high-molecular weight proteins.
Lee, A. L., Urbauer, J. L. & Wand, A. J. Improved labeling strategy for 13C relaxation measurements of methyl groups in proteins.
Welander and her team noticed that as with eukaryotes, some bacteria modify sterols by removing chemicals called methyl groups in a process called demethylation.
