Rotating Image 1 Rotating Image 2 Rotating Image 3 Rotating Image 4 Rotating Image 5 Rotating Image 6
loading . . .

Overview

The project goal of BNUZH-China iGEM 2025 is to design a light-regulated pigment synthesis system and achieve pigment production through dual-plasmid co-expression. Based on our constructed light control and pigment systems, we have cataloged the relevant pathway designs including basic parts, composite pigment synthesis modules, and light control system components. All these elements have undergone synthesis and functional validation, and will be made accessible to the global community. Detailed listings will be provided in the subsequent section.

Basic parts

Number Short description Long description
BBa_25RIK1VS EcTnaA A gene from Escherichia coli encoding a kind of tryptophanase.
BBa_251L4NGE MaFMO A gene from Methylophaga aminisulfidivorans encoding flavin-dependent monooxygenase.
BBa_25UDOH90 YF1 The YF1 gene encodes a fusion histidine kinase.
BBa_25SQZ12O FixJ The gene fixJ encodes a protein that can be phosphorylated by YF1 to initiate downstream gene expression.
BBa_K2296017 Pfix-K2 This promoter can be activated by the phosphorylated protein FixJ, initiating downstream gene expression.
BBa_K1725040 PhlF The gene PhlF encodes a protein that inhibits the promoter pPhlF.
BBa_K1725000 pPhlF When the promoter pPhlF binds to the PhlF protein, its function is inhibited and downstream genes cannot be expressed.
BBa_25MREMGW PadC4 The gene encodes a di-guanylate cyclase that catalyzes the synthesis of c-di-GMP from GTP in a near-infrared light dependent manner.
BBa_25KQ28VU BphO The gene encodes a heme oxygenase that catalyzes the oxidation of heme to produce biliverdin,an essential cofactor that functions as a chromophore for light-sensing proteins.
BBa_256M7X59 YhjH A gene from Escherichia coli encoding a c-di-GMP-specific phosphodiesterase, involved in c-di-GMP degradation and maintenance of low intracellular c-di-GMP levels.
BBa_25S48UIO MrkH A gene from Klebsiella quasipneumoniae encoding a c-di-GMP-specific phosphodiesterase,which is a transcriptional activator that specifically responds to c-di-GMP and activates transcription from the synthetic promoter PmrkA.
BBa_K5210015 PmrkA A promoter from red light-responsive system,which is regulated by the MrkH protein, directly activates transcription from the mrkA promoter to initiates downstream gene expression.
BBa_250ASSOU SttH The gene encodes a flavin-dependent tryptophan 6-halogenase that relies on FAD and molecular oxygen as cofactors, and functions as a key enzyme in the biosynthesis of halogenated indole compounds.
BBa_K3722004 Fre A gene from Escherichia coli encoding a flavin reductase that primarily functions to continuously supply the flavin-dependent halogenase SttH with essential reduced cofactors, promoting the bromination reaction.
BBa_259FDUZF L3 linker The gene encodes an extended flexible peptide linker that covalently connects the two functional protein domains Fre and SttH in a fused configuration.
BBa_25WVGYOO pJ23119 pJ23119 is a strong constitutive promoter, capable of driving downstream gene expression independently of external regulation.
BBa_25MEK6RV ho1 The gene ho1 encodes the HO1 protein.HO1 protein is heme oxygenase, which catalyzes the conversion of heme to biliverdin.
BBa_25F1AWKV pcyA The gene pcyA encodes the PcyA protein.The PcyA protein is ferredoxin oxidoreductase, which catalyzes the conversion of biliverdin to phycocyanin.
BBa_25N1634Z mini-CcaS The gene mini-CcaS encodes the protein mini-CcaS.Removing two PAS domains and fusing together the GAF and HK domains with a truncated linker region, to form “miniaturized CcaSs”. Compared with wild-type, the miniaturized CcaSs is able to tightly regulate gene expression, achieving high expression of the target gene under inductive conditions and strict gene repression under non-inductive condition.
BBa_25JE4V2X CcaR The gene CcaR encodes the protein CcaR.It is a typical response regulator of the OmpR class, which consists of an N-terminal receiver domain and a C-terminal DNA-binding domain.
BBa_25C6K297 txtE The gene txtE encodes TxtE protein.TxtE protein is a novel cytochrome P450 enzyme.It can catalyze regiospecific 4-nitration of L-tryptophan.It can nitrate non-natural substrates that are structurally similar to L-tryptophan with decorated indole side chains and modified amino acid moieties.
BBa_25I36CTL txtD The gene txtD encodes TxtD protein.TxtD protein is a nitric oxide synthase (NOS) that generates NO from L-arginine.
BBa_25JSNLBP Fdr The gene Fdr encodes the protein FdR.FdR protein is a ferredoxin reductase that contains a flavin adenine dinucleotide (FAD) cofactor.It can reduce Fdx.
BBa_252BZZLO Fdx The gene Fdx encodes Fdx protein.Fdx protein is a small iron-sulfur protein ferredoxin.It can be reduced by the FdR protein.
BBa_K2012015 PcpcG2-172 PcpcG2-172 is a green light-inducible promoter. CcaS regulates the phosphorylation of CcaR by transferring the phosphate group (P) to CcaR; the phosphorylated CcaR then binds to the promoter PcpcG2-172, thereby further promoting the expression of the target gene.
BBa_252VLWW7 terminator DT25 This is a terminator, specifically the DT25 terminator derived from the pJFR2 plasmid constructed in the RGB system, which is used in conjunction with the promoter pPhlF.
BBa_J23100 pJ23100 pJ23100 is a strong constitutive promoter, capable of driving downstream gene expression independently of external regulation.
BBa_J23106 pJ23106 pJ23106 is a strong constitutive promoter, capable of driving downstream gene expression independently of external regulation.

Composite parts

Number Short description Long description
BBa_25PTX563 EcTnaA-MaFMO EcTnaA converts tryptophan (trp) and 6-Halogen-trp (6-X-trp) into indole or 6-X-indole,and MaFMO converts indole and 6-X-indole into indigo or tyrian purple dyes.
BBa_25NJPEI3 YF1-fixJ-Pfix-K2-PhlF-pPhlF The flavin mononucleotide (FMN) in Escherichia coli serves as a photoreceptor. In the absence of blue light stimulation, FixJ is phosphorylated, PhIF is expressed, and binds to pPhlF, inhibiting downstream gene expression. When stimulated by 470nm blue light, FMN forms a covalent bond with cysteine, inducing conformational changes in broussonetia papyrifera. YF1 is unable to phosphorylate FixJ, thereby suppressing the expression of PhIF. The pPhlF promoter functions normally, activating downstream gene expression.
BBa_25WDWQKK T7 promoter-YF1-FixJ-Pfix-k2-PhlF-T7 terminator We constructed the T7 promoter-YF1-FixJ-Pfix-k2-PhlF-T7 terminator system to express YF1 and FixJ proteins. The YF1 protein phosphorylates the FixJ protein, thereby activating the Pfix-k2 promoter and enabling downstream gene PhlF expression.
BBa_25LZEKHX pJ23100-YF1-FixJ-Pfix-k2-PhlF-rrnB T1 terminator We constructed the pJ23100-YF1-FixJ-Pfix-k2-PhlF-rrnB T1 terminator system to express YF1 and FixJ proteins. The YF1 protein phosphorylates the FixJ protein, thereby activating the Pfix-k2 promoter and enabling downstream gene PhlF expression.
BBa_25HA7WRH pPhlF-EcTnaA-MaFMO-L3S3P11 terminator We constructed a pPhlF-EcTnaA-MaFMO-L3S3P11 terminator to express EcTnaA and MaFMO proteins. The promoter pPhlF is regulated by PhlF protein. When PhlF protein binds to it, it can not activate the expression of downstream genes. Through this blue light control system, indigo synthesis can be controlled.
BBa_25A51YUG Fre-L3linker-SttH Fre-L3linker-SttH is an artificialy designed fusion protein complex that covalenty links the favn reductase (Fre) and the halogenase (SttH) through a fexible L3 peptide linker.This design enhances the catalytic activity of SttH and improves the efficiency of the bromination reaction.
BBa_25RA4SZ7 T7-Fre-L3linker-SttH-T7 terminator T7-Fre-L3linker-SttH-T7 terminator is a T7 promoter-driven expression cassette designed to validate the expression of the Fre-L3linker-SttH gene.
BBa_25PH8HYY PmrkA-Fre-L3linker-SttH-rrnB T1 terminator The PmrkA-Fre-L3linker-SttH-rrnB T1 terminator is a PmrkA promoter-driven expression cassette that functions as a key component for pigment production under red-light control.
BBa_25YXIYJK pJ23106-PadC4-BphO-rrnB T1 terminator-pJ23119-YhjH-MrkH-rrnB T1 terminator The genetic construct pJ23106-PadC4-BphO-rrnB T1 terminator-pJ23119-YhjH-MrkH-rrnB T1 terminator constitutes a composite red-light-sensing system. Upon red-light irradiation, this system can be stringently regulated to initiate the expression of downstream genes.
BBa_252ZD6ON pJ23108-ho1-pcyA-pJ23106-mini-CcaS-pJ23100-CcaR This composite part functions as a green light control system.Upon irradiation with green light at 520 nm, this system functions to initiate the expression of downstream genes.
BBa_254C5ONH PcpcG2-172-txtE-txtD-terminator DT25-pJ23106-Fdr-Fdx This is a green pigment synthesis system. After the green light-controlled system exerts its function, the promoter PcpcG2-172 is activated, thereby promoting the expression of 4,4'-dinitroindigo synthesis-related genes.

Part collections

Number Short description Long description
9d9d1fae-5707-424d-9536-82b189e9f976 An indigo synthesis system controlled by blue light We build this system to approach the indigo synthesis controlled by blue light.
ac229bb8-c387-4f07-945e-68b87f0caa4e An 6,6'-dibromoindigo synthesis system controlled by red light We built this system to produce 6,6'-dibromoindigo under red light irradiation.
2d95ed9f-ff40-40dd-9d57-470bde3edf48 An 4,4'-dinitroindigo synthesis system controlled by green light We built this system to produce 4,4'-dinitroindigo under green light irradiation.