Expression of marker RNAs in Pseudomonas putida

Area of Science:

• Molecular Biology
• Microbial Genetics
• Synthetic Biology

Background:

• Developing novel expression vectors is crucial for synthetic biology.
• Pseudomonas putida is a versatile bacterial host with significant biotechnological potential.
• Efficient expression of non-native RNA molecules requires carefully engineered genetic constructs.

Purpose of the Study:

• To engineer a novel broad-host-range vector for expressing artificial RNA in Pseudomonas putida.
• To characterize the expression levels and cellular impact of the artificial RNA.
• To assess the potential for developing artificial RNA expression systems in diverse bacterial species.

Main Methods:

• Construction of a broad-host-range vector derived from pBBR1MCS, incorporating Escherichia coli rrnB regulatory elements (P1, P2, T1, T2).
• Cloning of an artificial RNA gene derived from Vibrio proteolyticus 5S rRNA into the vector.
• Expression and analysis of the artificial RNA in P. putida via Northern blotting and ribosome profiling.
• Comparison with the expression of wild-type V. proteolyticus 5S rRNA.

Main Results:

• The engineered vector successfully expressed a unique artificial RNA in P. putida.
• The artificial RNA accumulated to 10-20% of the total 5S rRNA pool.
• The artificial RNA was not incorporated into ribosomes and showed minimal impact on cell growth rate.
• Wild-type V. proteolyticus 5S rRNA, when expressed, was incorporated into ribosomes.

Conclusions:

• A functional artificial RNA expression system has been established in P. putida using a novel broad-host-range vector.
• The engineered artificial RNA is stable and does not interfere with essential cellular processes like ribosome biogenesis or growth.
• This vector system holds promise for the development of diverse artificial RNA applications across a wide range of bacterial species.