cymR Repressor

Introduction

The 2022 UT Austin iGEM Team’s Part Collection provides a number of DNA sequences and procedures for genetically engineering Acinetobacter baylyi ADP1. We were able to effectively engineer ADP1's genome using a two-step genetic engineering protocol. See the Engineering Page for more details on how we modified ADP1's genome. On this page, we explain how our part collection can be used alongside this two-step protocol to delete ADP1 genes, insert DNA sequences into any chromosomal location, and engineer an ADP1-based biosensor to detect any DNA sequence of interest.

We hope this part collection guides future iGEM teams in engineering ADP1 and utilizing ADP1’s flexibility to tackle any challenge in synthetic biology.

Categorization

For our parts collection, we categorize our parts into the following categories:

Upstream

An Upstream basic part is a DNA sequence directly upstream of a target gene. These basic parts are homology flanks that are used for ADP1 Genetic Engineering. Examples include the ACIAD2049 Upstream for P. destructans detector (BBa_4342003) and pbpG Upstream (BBa_4342011).

Downstream

A Downstream basic part is a DNA sequence directly downstream of a target gene. These basic parts are homology flanks that are used for ADP1 Genetic Engineering. Examples include ACIAD2049 Downstream for P. destructans detector (BBa_4342004) and pbpG Downstream (BBa_4342012).

Integration Cassettes

An "Integration" cassette is a composite part consisting of an "Upstream" basic part, the tdk/kan basic part (BBa_4342000), and a "Downstream" basic part. These parts are designed to use in the first transformation step in ADP1 Genetic Engineering. Examples include the ACIAD2049 Integration cassette (BBa_4342019) and the acrB Integration cassette (BBa_4342023).

Rescue Cassettes

"Rescue" cassette is a composite part consisting of an "Upstream" basic part, an optional genetic device, and a "Downstream" basic part. These parts are designed to use in the second transformation step in ADP1 Genetic Engineering. Examples include the ACIAD2049 Rescue cassette (BBa_4342020, Upstream + Downstream), the YFP Rescue cassette (BBa_4342030, Upstream + Genetic Device + Downstream), and the nptII Detector Rescue cassette (BBa_4342031, Upstream + Composite Part + Downstream).

Genetic Device

"Genetic Device" is a basic part that can be any DNA sequence to be integrated into ADP1. Examples include the CymR YFP (BBa_4342008) and the nptII Broken Gene (BBa_4342015).

We further categorize each part with a standardized Golden Gate Assembly (GGA) Type 1-8 Overhang [2]. Each type is ligated to a complementary type (ex. Type 2 can be ligated to Type 1 and Type 3). Moreover, some parts contain consecutive GGA Type numbers, such as Type 234. These DNA sequences start with a Type 2 Overhang and end with a Type 4 Overhang (ex. tdk/kan cassette (BBa_4342000).

Usage and Biology

The CymR repressor in Acinetobacter baylyi ADP1 codes for a repressor of the CymR YFP promoter. The repressor deactivates the CymR YFP promoter, which inhibits the expression of a YFP gene.

Design

The CymR repressor part includes the 1007 base pairs comprising the CymR repressor. This part has BsaI restriction sites attached to the 5’ and 3’ ends, which are specifically designed to ligate to the tdk/kan cassette composite part (BBa_K4342000)and the P. destructans Target Sequence Downstream Homology (BBa_4342006)via BsaI digestion.

BsaI Restriction Site

The BsaI site is designed to ligate to the 3’ end of the tdk/kan cassette, (BBa_K4342000)and the 5’ end of the P. destructans Target Sequence Downstream Homology (BBa_4342006)creating the repression circuitry that deactivates the CymR YFP promoter. This part allows for screenable selection of YFP when it is removed via homologous recombination by the P. destructans entire homology.

References