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2 Cadmium Poisoning Ingestion of cadmium can cause: Cancer Renal failure Bone weakening and fracture Damage to nervous and immune systems Death Danger Level Present in over 60% of hazardous waste sites as identified by the EPA
3 Sources of contamination Mining operations Sewage Irrigation water
4 Cadmium Detection Current cadmium measurement techniques Atomic Absorption Spectroscopy Advantages of Biosensor More affordable Measures bio-available cadmium
5 Objective Engineer B. subtilis to sense cadmium Create Biobrick Parts Construct Devices Transform Devices into B. subtilis Characterize Chassis
6 Bacillus subtilis Chassis Gram positive soil bacteria Well characterized Naturally competent Complex metal ion homeostasis system
7 Metal Ion Homeostasis Influx Protein (MntH) Efflux Protein (CadA)
8 Cadmium Influx Regulation Inactive Repressor (MntR) Active Repressor (MntR) Cadmium Repressor (mntr) Repressor (mntr)
9 Low Intracellular [Cadmium] Cadmium Influx Protein (MntH) Inactive Repressor (MntR) Influx Protein Gene (mnth) Influx Promoter (MntH)
10 High Intracellular [Cadmium] Cadmium Active Repressor (MntR) Influx Protein Gene (mnth) Influx Promoter (MntH)
11 Cadmium Efflux Regulation Inactive Repressor (czra) Active Repressor (czra) Cadmium Repressor (mntr) Repressor (mntr)
12 Low Intracellular [Cadmium] Cadmium Active Repressor (CzrA) Efflux Protein (CadA) Promoter Efflux Protein Gene (cada)
13 High Intracellular [Cadmium] Inactive Repressor (CzrA) Cadmium Efflux Protein (CadA) Efflux Protein Gene (cada) Efflux Protein (CadA) Promoter
14 Objective Engineer B. subtilis to sense cadmium Create Biobrick Parts Construct Devices Influx Protein (mnth) Efflux Protein (cada) Internal Reference (mrga, mrgarbs) Cadmium Sensor Module A Cadmium Sensor Module B Internal Reference Module Transform Devices into B. subtilis Characterizing Chassis
15 Cadmium Sensor Module A Absence of cadmium increases expression of YFP reporter sequence Inactive Repressor (MntR) No Repression RBS YFP Coding Sequence Influx Promoter (MntH) Expression YFP
16 Module A: Active Form Inactive Repressor (MntR) Cd(II) Active Repressor (MntR) Repression Influx Promoter (MntH) RBS YFP Coding Sequence No Expression
17 Cadmium Sensor Module B Absence of cadmium decreases expression of CFP reporter sequence Active Repressor (CzrA) Repression RBS CFP Coding Sequence Efflux Promoter (CadA) No Expression
18 Module B: Active Form Active Repressor (CzrA) Cadmium Inactive Repressor (CzrA) No Repression RBS CFP Coding Sequence Efflux Promoter (CadA) Expression CFP
19 Possible outputs Condition Detectable Cadmium Undetectable Cadmium Dead cells Module A (influx mnth) Module B (efflux cada) Active Inactive Legend Can t distinguish between an undetectable level of cadmium and dead cells!
20 Internal Reference Module (Mutated) Metal regulated Gene A (mrga) reference promoter Constitutive Similar level of expression between mrga and cada promoters Constitutive RBS Reference Promoter (mrga) GFP Coding Sequence Expression GFP
21 New possible outputs Condition Module A (influx mnth) Module B (efflux cada) Internal Reference Module Sufficient Cadmium Insufficient Cadmium Dead Cells Can distinguish between conditions!
22 Integrated System Module A (Influx protein mnth) RBS YFP Coding Sequence Module B (Efflux protein cada) RBS CFP Coding Sequence Internal Reference Module RBS GFP Coding Sequence
23 Objective Engineer B. subtilis to sense Cd(II) Create Biobrick Parts Influx protein (mnth) Efflux protein (cada) Internal Reference(mrgA, mrga rbs) Construct Devices Cadmium Sensor Module A Cadmium Sensor Module B Reference Module Transform Devices into B. subtilis Single Homologous Recombination Double Homologous Recombination Identify Appropriate Strain for Chassis *Intermediate Constructs Completed
24 Integration into B. subtilis Chromosomal DNA Single Homologous Recombination Efflux Promoter (CadA) Plasmid RBS CFP Coding Sequence Chromosome Efflux Promoter (CadA) Efflux Protein Gene (cada)
25 Integration into B. subtilis Chromosomal DNA Double Homologous Recombination Plasmid Reference Promoter (mrga) 5 amye RBS GFP Coding Sequence 3 amye Chromosome amye
26 Objective Engineer B. subtilis to sense Cd(II) Create Biobrick Parts Construct Devices Influx protein (mnth) Efflux protein (cada) Internal Reference(mrgA, mrga rbs) Cadmium Sensor Module A Cadmium Sensor Module B Reference Module Transform Devices into B. subtilis Characterizing for Chassis Single Homologous Recombination Double Homologous Recombination WT mnth null mntr null
27 Characterizing Chassis: WT Need to find appropriate sensing range 0 um 2.5 um 5 um 10 um
28 Optimizing Sensitivity Increase number of healthy cells Increase sensitivity of each cell
29 Characterizing Chassis: mnth null mnth null growth normal at high [Cadmium] mnth null wild type
30 Characterizing Chassis: mntr null mntr null increases sensitivity to Cadmium Cd(II) Influx Protein (MntH) No MntR Repressor Influx Promoter (MntH) Influx Protein Gene (mnth)
31 Optimizing Sensitivity Increase number of healthy cells Decrease Cadmium influx by reducing mntr expression Increase sensitivity of each cell Increase Cadmium influx by reducing mnth
32 Objective Engineer B. subtilis to sense Cd(II) Create Biobrick Parts Construct Devices Influx protein (mnth) Efflux protein (cada) Internal Reference(mrgA, mrga rbs) Cadmium Sensor Module A Cadmium Sensor Module B Reference Module Transform Devices into B. subtilis Characterizing for Chassis Single Homologous Recombination Double Homologous Recombination WT mnth null mntr null
33 Future Work Complete Cadmium Sensor Modules Transform constructs in B. subtilis Compare cadmium sensitivity in different chassis: WT, Influx protein (mnth), Influx protein represssor (mntr) tuned strains Additional metal sensing promoters: copper(copz),arsenic(arsr)
34 Advisors and Sponsors Advisors: Dr. Maki Inada Dr. Carl Batt Dr. John D. Helmann Dr. Xiling Shen Sponsors: College of Engineering Weill Institute of Cell and Molecular Biology College of Agriculture and Life Sciences SAFC Bartels Co-sponsorship Special thanks to: Dr. Jeff Pleiss and his lab Dr. Ahmed Gaballa Dr. Kent Kemphues
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