Dual Transit Peptides for Chloroplast and Mitochondria Targeting
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Solution Overview
Problem
Current methods face challenges in precisely and efficiently targeting proteins synthesized by cytoplasmic ribosomes to their appropriate intracellular locations in transgenic higher plants, particularly for chloroplasts and mitochondria, which is crucial for transgenic plants to function correctly.
Innovation Solution
The development of recombinant chimeric nucleic acid molecules featuring dual transit peptides from the Amaranthus or Alopecurus genus, operably linked to heterologous nucleic acid sequences, enables efficient targeting of polypeptides to chloroplasts and mitochondria, including those with PPO activity for herbicide tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional single transit peptides are used for protein targeting, then the protein can be directed to one organelle, but the protein cannot be efficiently targeted to both chloroplasts and mitochondria simultaneously
Solution Approach 1:
The invention divides the targeting function into two separate transit peptide sequences (first transit peptide from Amaranthus genus and second transit peptide from Alopecurus genus) that work together in a dual transit peptide construct. This segmentation allows each peptide to contribute its organelle-specific targeting capability, enabling simultaneous targeting to both chloroplasts and mitochondria while maintaining precision through the cooperative action of the two segmented components.
Solution Approach 2:
The invention merges two distinct transit peptide sequences from different plant genera (Amaranthus and Alopecurus) into a single dual transit peptide construct. This combining of two functional elements with different targeting specificities creates a versatile targeting system that can direct proteins to multiple organelles (chloroplasts and mitochondria) simultaneously, resolving the contradiction between adaptability and precision.
2Adaptability or versatility
If dual targeting sequences are used, then proteins can reach both organelles, but the translocation efficiency decreases
Solution Approach 1:
The invention optimizes the parameters of the dual transit peptide by selecting specific transit peptide sequences from Amaranthus and Alopecurus genera that have complementary properties. By changing the parameters of the peptide sequences (amino acid composition, length, charge distribution) and their arrangement, the system achieves both dual organelle targeting capability and high translocation efficiency, overcoming the typical trade-off between versatility and productivity.
3Manufacturing precision
If precise protein localization is ensured, then organelle function is maintained, but the complexity of the targeting system increases
Solution Approach 1:
The dual transit peptide construct serves multiple functions simultaneously: it directs proteins to chloroplasts via the first transit peptide, directs proteins to mitochondria via the second transit peptide, and maintains precision for both targeting pathways. This multi-functionality in a single construct reduces the need for separate targeting systems for each organelle, thereby managing complexity while achieving precise localization to multiple destinations.
Data Source
AI summary
The present invention refers to a recombinant chimeric nucleic acid molecule comprising a nucleic acid sequence encoding a dual transit peptide operably linked to a heterologous nucleic acid sequence encoding a polypeptide of interest which, when overexpressed in a plant, confers herbicide tolerance to said plant.