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Blue-pigment indigoidine synthetase gene from Streptomyces lavendulae

Description

BpsA stands for the blue-pigment indigoidine synthetase gene,encoded by a single module-type nonribosomal peptide synthetase (NRPS).It can synthesize two molecules of glutamine into one molecule of indigo.Itself is derived from Streptomyces lavendulae.

But Corynebacterium glutamicum is usually used to express bpsA for high indigo production,because it carries strong fluxes for the biosynthesis of L-glutamate, a precursor of L-glutamine.Meanwhile,C. glutamate can also heterologously express indigo synthase and has the pcpS gene,which expresses PPTase(4'-phosphopantetheinyl transferase).The PPTase is of great significance becasuse it mediates the activation of the apo-form of BpsA into its active holo-form by adding coenzyme A to the peptide carrier domain (PCP).

In this experiment we will optimize Komagataeibacter xylinus to express bpsA for one-step synthesis of colored fibers, and also codon optimize the bpsA coding sequence.

Experiment

Expression of indigo in Corynebacterium glutamicum

We successfully expressed bpsA in Corynebacterium glutamicum. As shown below, the right conical flask shows the fermentation results after introducing empty PEKEX2 into the C. glutamicum, whereas the left conical flask shows the fermentation results of indigo production after introducing bpsA plasmid into C.glutamicum.

Below is a diagram of Thomas Brilliant Blue staining of Corynebacterium glutamicum. From left to right, the first lane is the whole cell lysate of Valley Stick, the second lane is the whole cell lysate after introduction of the plasmid, the third lane is the supernatant of wild-type C. glutamicum, and the fourth lane is the supernatant after introduction of the plasmid. It indicates that bpsA successfully expressed indigo after introduction of the plasmid.

Prediction of alpha fold of BpsA-expressed proteins

Direct Dyeing

We stained the bacterial cellulose membranes directly with indigo-containing grain stick cultures

Co-culturing

In order to pave the way for the subsequent one-step production of colored fibers by expressing bpsA directly in K.xylinus, we first started with a co-culture of K. xylinus with C. glutamicum as a way to further explore the way indigo binds to bacterial cellulose as well as the physical and chemical properties. Unfortunately, we were not able to obtain colored membrane BC first, but rather colored granular bacterial cellulose.

Expression of bpsA in K. xylinus

With previous basic explorations, we will use a wood vinegar compatible PSB1A2 plasmid backbone, ligated with promoters such as strong promoters (J23104, J23102, etc.), and bpsA sequences to try to express bpsA in K. xylinus while binding to bacterial cellulose membranes.

References

[1] Mohammad Rifqi Ghiffary, Cindy Pricilia Surya Prabowo, Komal Sharma, Yuchun Yan, Sang Yup Lee, and Hyun Uk Kim.High-Level Production of the Natural Blue Pigment Indigoidine from Metabolically Engineered Corynebacterium glutamicum for Sustainable Fabric Dyes ACS Sustainable Chemistry & Engineering 2021 9 (19), 6613-6622

Sequence and Features