Phosphatidylethanolamine methyltransferases are biosynthetic enzymes that catalyze the transfer of one or more methyl group(s) from S-adenosyl-L-methionine onto phosphatidylethanolamine, monomethyl-phosphatidylethanolamine, or dimethyl-phosphatidylethanolamine to give either monomethyl-phosphatidylethanolamine, dimethyl-phosphatidylethanolamine or phosphatidylcholine. These enzymes are ubiquito...

Pulse radiolysis technique has been used to investigate the reaction of oxide radical ion (O.¡) with 4,6-dihydroxy-2-methyl pyrimidine (DHMP), 2,4-dimethyl-6-hydroxy pyrimidine (DMHP), 5,6-dimethyl uracil (DMU) and 6-methyl uracil (MU) in strongly alkaline medium. The second-order rate constants for the reaction of O.¡ with these compounds are in the range 2–5£ 108 dm3mol¡1 s¡1. The transient a...

Methyl-coenzyme M reductase (MCR) catalyzes both the synthesis and anaerobic oxidation of methane (AOM). Its catalytic site contains Ni at core cofactor F430. The ion, in its low-valent Ni(I) state, lights fuse leading to homolysis C–S bond methyl-coenzyme (methyl-SCoM) generate a methyl radical, which abstracts hydrogen atom from coenzyme B (HSCoB) mixed disulfide CoMSSCoB. Direct reversal thi...

In the title compound, C(19)H(12)BrFO(2)S, the O atom and the methyl group of the methyl-sulfinyl substituent lie on opposite sides of the plane through the naphthofuran fragment. The 4-fluoro-phenyl ring is rotated out of the naphthofuran plane, making a dihedral angle of 41.65 (7)°. In the crystal, mol-ecules are linked by weak inter-molecular C-H⋯O and C-H⋯π inter-actions, and a short Br⋯F c...

Pure six-fold symmetry (V6) internal rotation poses significant challenges to experimental and theoretical determination, as the very low torsional barriers result in huge tunneling splittings difficult to identify and to model. Here we resolved the methyl group internal rotation dynamics of 2,6- and 3,5-difluorotoluene using a newly developed computer code especially adapted to V6 problems. Th...

Transfer RNA (guanosine-2')-methyltransferase (Gm-methylase) catalyzes the transfer of a methyl group from S-adenosyl-l-methionine to 2'-OH of G18 in the D-loop of tRNA. Based on their mode of tRNA recognition, Gm-methylases can be divided into the following two types: type I having broad specificity toward the substrate tRNA, and type II that methylates only limited tRNA species. Protein synth...

A photochemical route for the synthesis of some benzopyronospiropyrans from 2-furyl-3-cycloalkenyloxybenzopyrones involving H-abstraction is reported. How a methyl group on the furyl ring affects the product formation is also investigated.

All atoms of the title mol-ecule, C(8)H(7)NO(3)S, except the two oxide O atoms and two H atoms of the methyl group, lie on a crystallographic mirror plane. The crystal structure is stabilized by weak inter- and intra-molecular C-H⋯O hydrogen bonds.

In the title compound, C(22)H(24)O(2)S, the cyclo-hexyl ring adopts a chair conformation. In the crystal, mol-ecules are linked by weak C-H⋯O and C-H⋯π inter-actions. In the methyl-sulfinyl group, the methyl group and S atom are disordered over two sets of sites, with site-occupancy factors of 0.58 (3) and 0.42 (3). In the ring of the 4-methyl-phenyl group, the four C atoms are disordered over ...