Cited by 52Plant biochemistry and biosynthesisPlant Molecular Biology ResearchLipid metabolism and biosynthesis

The N-terminal Domain of Tomato 3-Hydroxy-3-methylglutaryl-CoA Reductases

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Denbow, Cynthia J., Lång, Saara, Cramer, Carole L.·1996·Journal of Biological Chemistry

Abstract

The enzyme 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) catalyzes the conversion of 3-hydroxy-3-methylglutaryl-CoA to mevalonic acid, considered the rate-limiting step in isoprenoid biosynthesis. In plants, isoprenoid compounds play important roles in mediating plant growth and development, electron transport, photosynthesis, and disease resistance. Sequence comparisons of plant HMGR proteins with those from yeast and mammalian systems reveal high levels of sequence identity within the catalytic domain but significant divergence in the membrane domain. Mammalian HMGRs are integral membrane proteins of the endoplasmic reticulum with eight membrane-spanning regions. In contrast, the membrane domain of plant HMGRs is predicted to contain only one to two transmembrane spans. We have isolated and sequenced a clone (pCD4) encoding exon 1 of tomato hmg1. The membrane domain structures of two differentially regulated tomato HMGR isoforms, HMG1 and HMG2, were analyzed using in vitro transcription and translation systems. Microsomal membrane insertion of the tomato HMGRs is co-translational and does not involve cleavage of an N-terminal targeting peptide. HMGR membrane topography was established by protease protection studies of the HMG1 membrane domain and an analogous region of HMG2 engineered to contain a c-myc epitope tag. The data indicate that both tomato HMGRs span the membrane two times with both the C and N termini located in the cytosol. Lumenal localization of the short peptide predicted to lie within the endoplasmic reticulum was further confirmed by in vitro glycosylation of an asparagine-linked glycosylation site present in HMG2.

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  1. Enjuto, M., Balcells, L., Campos, N., Caelles, C., Arro, M., and Boronat, A. (1994) Proc. Natl. Acad. Sci. U. S. A. 91, 927-931
  2. Choi, D., Bostock, R. M., Avdiushko, S., and Hildebrand, D. F. (1994) Proc. Natl. Acad. Sci. U. S. A. 91, 2329 -2333
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Authors
Denbow, C. J., Lång, S., & Cramer, C. L.
Affiliations
Virginia Tech (US)
Corresponding author
Cramer, Carole L.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1996-04
Volume
271
Issue
16
Pages
9710-9715
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1510518889
Cited by
52
References
46
Citations by year
2024: 3 · 2022: 2 · 2021: 1 · 2018: 1 · 2017: 3 · 2015: 1 · 2014: 2 · 2013: 4 · 2012: 2
FWCI
1.51
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Agriculture
  • National Institutes of Health (5r29gm039549-05)
  • National Institute of General Medical Sciences (R29-GM39549)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
3-hydroxy-3-methylglutaryl-CoA reductase, HMG1, HMG2, N-terminal domain, membrane domains, transmembrane topology, isoprenoid biosynthesis, mevalonate, endoplasmic reticulum membrane insertion, co-translational insertion, asparagine-linked glycosylation, protein isoforms, plant sterol biosynthesis
MeSH terms
Amino Acid Sequence, Base Sequence, Cloning, Molecular, Glycosylation, Hydroxymethylglutaryl CoA Reductases, Intracellular Membranes, Microsomes, Molecular Sequence Data, Plants, Protein Processing, Post-Translational, Recombinant Proteins, Species Specificity, Protein Biosynthesis, Polymerase Chain Reaction, Sequence Homology, Amino Acid, Protein Structure, Secondary, DNA Primers, DNA, Complementary, Solanum lycopersicum

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