|Content of Plant Sterol Methyltransferases
So far as is known, the biosynthesis of phytosterols is a ubiquitous property
of plants and microbes, whereas insects fail to synthesize the sterol nucleus.
All of them require phytosterols to grow and mature. In recent years, the
availability of stable isotopes, modern instrumentation such as high-field
nuclear magnetic resonance spectroscopy and molecular biology have
offered new insights into the evolutionary development of sterol structure–
enzyme function relationships, pathway sequencing, chemical ecology, and in
the case of bioengineering provides a mechanism to generate value-added
traits. Here we describe results obtained with these techniques in relation to
the critical enzyme that controls the pattern of C-24 side-chain diversity,
the (S)-adenosyl-L-methionine: Δ24-sterol methyltransferase (SMT).
Key Words: Sterol methyltransferase, Sitosterol, Cholesterol, Sterol biosynthesis,