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ROP GTPases with a geranylgeranylation motif modulate alkaloid biosynthesis in Catharanthus roseus
Dikki Pedenla Bomzan1,2, Anuj Sharma1,2, Pamela Lemos Cruz3
1Molecular Plant Biology and Biotechnology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, Bengaluru 560065, India.
Specific plant Rho of Plants (ROP) GTPases, CrROP3 and CrROP5, are geranylgeranylated and positively regulate monoterpene indole alkaloid (MIA) biosynthesis in Catharanthus roseus.
Area of Science:
- Plant molecular biology
- Biochemistry
- Plant signaling
Background:
- Rho of Plant (ROP) GTPases are key signaling molecules in plants.
- Their role in specialized metabolism, particularly in the biosynthesis of monoterpene indole alkaloids (MIAs), is not well understood.
- Previous work indicated prenylated proteins are involved in MIA biosynthesis signaling.
Purpose of the Study:
- To investigate the role of specific geranylgeranylated ROP GTPases in modulating MIA biosynthesis in Catharanthus roseus.
- To identify which CrROP GTPases are prenylated and how they interact with protein geranylgeranyl transferase (PGGT-I).
Main Methods:
- Biochemical assays to determine protein prenylation.
- Molecular biology techniques including gene silencing and overexpression in planta.
- Protein-protein interaction studies.
- Subcellular localization studies.
Main Results:
- Only CrROP3 and CrROP5, possessing a CSIL motif, were specifically prenylated by PGGT-I.
- CrROP3 and CrROP5 interacted with CrPGGT-I and localized to the nucleus.
- Silencing CrROP3/CrROP5 reduced MIA biosynthesis, while overexpression increased it.
- CrROP2, lacking the CSIL motif, showed no effect on MIA biosynthesis.
Conclusions:
- CrROP3 and CrROP5 are geranylgeranylated and positively regulate MIA biosynthesis in C. roseus.
- The CSIL motif is crucial for PGGT-I interaction and the regulatory function of these ROPs.
- This study elucidates a novel mechanism of specialized metabolism regulation by prenylated ROP GTPases.
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