Difference between revisions of "Part:BBa K4765011"

Latest revision as of 07:11, 12 October 2023

MysB codon optimized

Introduction

MysB (O-MT), an O-methyltrans-ferase, converts Demethyl 4-deoxygadusol into 4-deoxygadusol (4-DG), completing the production of 4-DG, the basic substrate of MAAs^[1].

Figure 1. The biosynthetic pathway of shinorine, porphyra-334, palythine-Ser, and palythine-Thr

Usage and Biology

We performed codon optimization on BBa_K4273005(NpR5599) specifically for the Escherichia coli K12 strain, resulting in the creation of this part. The enzyme MysB catalyzes the second reaction involved in the biosynthesis of Mycosporine-like amino acids (MAAs) within E. coli.

Characterization

Anti-UV Survival Assay

We employed the Colony-Forming Unit (CFU) assay. After plasmid transformation and plating, we shielded one/half of the agar plate from UV light using a black cloth, while the other one/half was exposed to UV irradiation (6W power) with wavelengths of 254 nm and 365 nm for 10 seconds.

Figure 2. Anti-UV Assay.

Our experiments demonstrated that introducing three or four of the five enzymes from the MAA biosynthetic pathway into E. coli did not yield a significant enhancement in the bacterium's UV resistance. We postulate that this lack of effect may arise from two factors: Firstly, the synthetic pathway may not play a pivotal role amidst the numerous routes involved in MAA synthesis. Secondly, to augment MAA levels within E. coli through protein expression in the pathway, additional substrates like ATP and amino acids would likely be required in the reaction.

Figure 3. Plates displaying transformed E. coli after anti-UV assay.

Sequence and Features

References

1. ↑ Chen, M., Rubin, G. M., Jiang, G., Raad, Z., & Ding, Y. (2021). Biosynthesis and heterologous production of mycosporine-like amino acid palythines. The Journal of Organic Chemistry, 86(16), 11160–11168.