Difference between revisions of "Part:BBa K3748015"

Revision as of 12:11, 11 October 2022

pREV1

Weak strenght yeast promoter S.cerevisiae.

Sequence and Features

Team Estonia_TUIT2022 characterization of BBa_K3748015 (pREV1)

pREV1 is a constitutive promoter responsible for the expression of REV1, a gene encoding bi-functional DNA-directed DNA polymerase/deoxycytidyl transferase (Lee et al., 2015). This enzyme is involved in error-prone translesion synthesis, one of the pathways for DNA repair (Lawrence, 2004).

We quantified the expression driven by pREV1 using fluorescent proteins as reporter genes. The expression cassettes were integrated into the yeast genome, and the fluorescence of the reporter proteins was monitored by quantitative time-lapse microscopy. The fluorescence levels were compared to the cell background fluorescence of the control DOM90 strain, which does not express any fluorescent proteins

pREV1 promoters showed a constitutive level of Venus fluorescence throughout the experiment, confirming that it is a constitutive promoter. Compared to the background fluorescence of the DOM90 strain pREV1 demonstrated a five-fold higher level of fluorescence intensity (Figure 1).

<Figure 2. The expression level of Venus is controlled by pREV1. Bars indicate the mean fluorescence intensity (expressed in arbitrary units, AU) of pREV1-Venus and DOM090 control from the analyzed cell population. Error bars show standard deviation.

Analyzed constitutive promoters can be recommended when constant weak (pREV1 promoter) expression of a target gene is required.

References:

• Lee, M. E., DeLoache, W. C., Cervantes, B., & Dueber, J. E. (2015). A Highly Characterized Yeast Toolkit for Modular, Multipart Assembly. ACS Synthetic Biology, 4(9), 975–986. https://doi.org/10.1021/SB500366V/SUPPL_FILE/SB500366V_SI_002.ZIP
• Lawrence, C. W. (2004). Cellular functions of DNA polymerase ζ and REV1 protein. Advances in Protein Chemistry, 69, 167–203. https://doi.org/10.1016/S0065-3233(04)69006-1