Cited by 130Plant biochemistry and biosynthesisCholesterol and Lipid MetabolismLipid metabolism and biosynthesis

Developmental regulation of sterol biosynthesis in Zea mays

Guo, De‐an, Venkatramesh, M., Nes, W. David·1995·Lipids

Abstract

Sixty-one sterols and pentacyclic triterpenes have been isolated and characterized by chromatographic and spectral methods from Zea mays (corn). Several plant parts were examined; seed, pollen, cultured hypocotyl cells, roots, coleoptiles (sheaths), and blades. By studying reaction pathways and mechanisms on plants fed radiotracers ([2-(14)C]mevalonic acid, [2-(14)C]acetate, and [2-(3)H]acetate), and stable isotopes (D2O), we discovered that hydroxymethylgutaryl CoA reductase is not "the" rate-limiting enzyme of sitosterol production. Additionally, we observed an ontogenetic shift and kinetic isotope effect in sterol biosynthesis that was associated with the C-24 alkylation of the sterol side chain. Blades synthesized mainly 24 alpha-ethyl-sterols, sheaths synthesized mainly 24-methyl-sterols, pollen possessed an interrupted sterol pathway, accumulating 24(28)-methylene-sterols, and germinating seeds were found to lack an active de novo pathway. Shoots, normally synthesizing (Z)-24(28)-ethylidine-cholesterol, after incubation with deuterated water, synthesized the rearranged double-bond isomer, stigmasta-5,23-dien-3 beta-ol. Examination of the mass spectrum and 1H nuclear magnetic resonance spectrum of the deuterated 24-ethyl-sterol indicated the Bloch-Cornforth route originating with acetyl-CoA and passing through mevalonic acid to sterol was not operative at this stage of development. An alternate pathway giving rise to sterols is proposed.

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Crossref · 10.1007/bf02537823

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Authors
Guo, D., Venkatramesh, M., & Nes, W. D.
Affiliations
Texas Tech University (US)
Venue
Lipids
Publisher
Wiley
Published
1995-03
Volume
30
Issue
3
Pages
203-19
ISSN
  • 0024-4201 (ISSN-L)
  • 1558-9307
OpenAlex
W2035132561
Cited by
130
References
52
Citations by year
2026: 3 · 2025: 1 · 2024: 3 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 3 · 2019: 9 · 2018: 4 · 2017: 5 · 2016: 4 · 2015: 4 · 2014: 1 · 2013: 4 · 2012: 6
FWCI
2.48
Type
journal article
Language
en
Open access
closed
Locations
  • Lipids (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
sterol biosynthesis, maize, plant development, sitosterol, rate-limiting enzyme, kinetic isotope effects, heavy water, mevalonate pathway, pollen, seed germination, coleoptile, blades, roots
MeSH terms
Acetates, Alkylation, Carbon Radioisotopes, Chromatography, High Pressure Liquid, Zea mays, Hydroxymethylglutaryl CoA Reductases, Mevalonic Acid, Models, Biological, Oxidation-Reduction, Phytosterols, Seeds, Sitosterols, Mass Spectrometry, Tissue Distribution, Plant Roots, Plant Shoots

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