Introduction to 3-Hydroxy-3-Methylglutaryl-Coenzyme A Reductase (HMGR)
3-Hydroxy-3-methylglutaryl-coenzyme A reductase (HMGR) is a crucial enzyme in the mevalonate pathway, which is responsible for the biosynthesis of isoprenoids, including sterols and terpenoids. In plants, HMGR plays a pivotal role in regulating the production of phytosterols and other secondary metabolites essential for plant growth and defense. The rubber tree, Hevea brasiliensis, contains multiple HMGR genes, including HMGR2, which is part of a small gene family involved in isoprenoid biosynthesis.
Expression and Regulation of HMGR Genes in Hevea brasiliensis
In Hevea brasiliensis, the HMGR gene family includes five members (HMGR1 to HMGR5). The expression of these genes varies across different tissues and conditions. For instance, HMGR4 and HMGR5 are highly expressed in mature leaves and xylem. While HMGR1 has been associated with high latex yield and is upregulated in high-yielding clones, specific studies on HMGR2's expression patterns and regulatory mechanisms are scarce.
Table 1: HMGR Expression in Hevea brasiliensis
Gene
Tissue Expression
Association with Yield
HMGR1
High in high-yielding clones
Positive correlation with latex yield
HMGR2
Limited data available
Not specifically studied for yield association
HMGR4 & HMGR5
Mature leaves and xylem
Not directly linked to latex yield
Table 2: Effects of HMGR Overexpression in Plants
Plant Species
HMGR Overexpression Effect
Tobacco
Increased phytosterol content
Catharanthus roseus
Enhanced terpenoid production
Avocado
Larger fruit size
References Characterization and Function of 3-Hydroxy-3-Methylglutaryl-CoA Reductase. Characterization and Function of 3-Hydroxy-3-Methylglutaryl-CoA Reductase. Frameshift variation in the HMG-CoA reductase gene and pharmacogenetic relationship with hypercholesterolemia in type 2 diabetes mellitus patients. Expression of the Hevea brasiliensis 3-Hydroxy-3-Methylglutaryl Coenzyme A Reductase in Tobacco. Expression analysis of rubber biosynthetic pathway genes in Hevea brasiliensis. Genome-Wide Identification and Characterization of the HMGR Gene Family. Regulation of partitioned sterol biosynthesis in Saccharomyces cerevisiae.
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Notes
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Reconstitution
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Synonyms
HMGR2; 3-hydroxy-3-methylglutaryl-coenzyme A reductase 2; HMG-CoA reductase 2; Fragment