Enhanced Globulin-1 Promoter for Seed-Specific Protein Expression
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Solution Overview
Problem
There is a need for promoters that show high activity and tissue preference in cereal seed tissues for the production of recombinant proteins, as existing promoters often express proteins in non-target tissues, potentially harming plant health and complicating protein containment.
Innovation Solution
An enhanced globulin-1 regulatory region with repeated transcriptional binding domains and a transcription initiation site is used to drive expression preferentially in plant embryos, increasing protein accumulation in seed tissues while minimizing expression in other tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional promoters are used to drive gene expression in plants, then protein expression occurs in multiple tissues including non-target tissues, but this causes harm to plant health and complicates protein containment
Solution Approach 1:
The patent applies local quality by designing a promoter that confers tissue-specific expression, making the promoter active only in seed storage tissues rather than throughout the entire plant. This is achieved by using seed-preferred promoter sequences that are naturally restricted to specific tissue types, thereby localizing protein expression to where it is needed while avoiding harmful effects in other tissues.
2Productivity
If conventional promoters are used to drive gene expression in plants, then protein expression occurs in multiple tissues, but this complicates protein containment
Solution Approach 1:
By restricting promoter activity to seed storage tissues through the use of tissue-specific promoter sequences, the patent simplifies protein containment. The protein is expressed only in non-mobile storage tissues where it remains sequestered, eliminating the need for complex containment systems that would be required if expression occurred in vascular or mobile tissues.
3Productivity
If promoters with high activity are used to drive gene expression, then protein accumulation increases, but expression in metabolically active tissues causes detrimental effects on plant health
Solution Approach 1:
The patent resolves this contradiction by using promoters that are active only in seed storage tissues, which are metabolically less active compared to growing tissues. This allows high-level protein accumulation to occur in storage tissues without the detrimental effects that would result from high-level expression in metabolically active tissues such as leaves, roots, or developing flowers.
Solution Approach 2:
The patent employs promoters that are active during seed development and storage phases, before the plant requires high metabolic activity for growth and reproduction. This timing strategy allows protein accumulation to occur preliminarily in storage tissues without interfering with subsequent metabolically demanding processes.
Data Source
AI summary
An enhanced globulin-1 regulatory region is shown, a nucleotide sequence of which includes at least one additional copy of a region of the globulin-1 regulatory region which includes at least one transcriptional factor binding domain, combined with a transcription initiation site and translation start site. The promoter provides improved seed preferred, and particularly embryo preferred expression in plants. Methods of use are also shown in preferentially expressing a heterologous protein to the embryo tissue of a plant.