cab’extrac2on:’’asynthe2c’biology’approach’to’microbial...
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![Page 1: CAB’Extrac2on:’’ASynthe2c’Biology’Approach’to’Microbial ...2012.igem.org/files/poster/Lethbridge.pdf · 2012-10-14 · Figure’3.’Acid%concentraon%presentin%glucose%supplemented%LB%media](https://reader030.vdocuments.us/reader030/viewer/2022040916/5e901298ae3c0272340c5632/html5/thumbnails/1.jpg)
Figure 3. Acid concentra,on present in glucose supplemented LB media inoculated with E. coli. n=3, error bars indicate ±SD.
CAB Extrac2on: A Synthe2c Biology Approach to Microbial Enhanced Oil Recovery
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Iain Barkley, Harland Brandon, Mackenzie Coatham, Nathan Dawson, Sutherland Dubé, Jenna Friedt, Dipankar Goyal, Katherine Gzyl, Jennifer Huynh, Boris Lam, Alvin Lee, Jus,n Luu, Richard McLean, Fan Mo, Makay Murray, Ryan Pederson, Dus,n Smith, Zak
S,nson, Anthony Vuong, Ben Vuong, Isaac Ward, and Hans-‐Joachim Wieden University of Lethbridge, 4401 University Drive Lethbridge, Alberta, Canada T1K 3M4
Increasing global oil demands require new, innova,ve technologies for the extrac,on of unconven,onal oil sources such as those found in Alberta’s Carbonate Triangle. Carbonate oil deposits account for almost 50% of the world’s oil reserves and approximately 26% of the bitumen found in Alberta1. Due to unstable oil prices in Western Canada, these vast reserves have historically been set aside in favor of less ,me consuming, more economical sites. Microbial enhanced oil recovery (MEOR) has been u,lized across the world to increase the produc,vity of difficult resources including carbonate oil deposits.
Using a synthe,c biology approach, we have designed the CAB (CO2, ace,c acid, and biosurfactant) extrac,on method that demonstrates a modified MEOR method for extrac,ng carbonate oil deposits. CAB extrac,on will u,lize the natural carbon fixa,on machinery in the cyanobacteria Synechococcus elongatus to convert CO2 into sugars to fuel ace,c acid and biosurfactant produc,on in Escherichia coli. Ace,c acid applied to carbonate rock increases the pore sizes and allows for enhanced oil recovery. The reac,on produces gases that will help pressurize the well site to facilitate extrac,on. The natural biosurfactant rhamnolipid will also be applied to the carbonate rock to further enhance extrac,on yields.
By coupling carbon capture with ace,c acid and biosurfactant produc,on, carbonate oil deposits can be mined with reduced greenhouse gas emissions. The use of carbon fixa,on to feed downstream systems can be tailored for use as a module in many applica,ons requiring inexpensive methods for fueling biological systems. CAB extrac,on will be suitable for large-‐scale bioreactors, providing an alterna,ve, inexpensive, and environmentally sustainable method for MEOR from Alberta’s oil deposits. Furthermore, developing the carbon capture module will be of interest in oil extrac,on strategies using steam, as it will help with the mi,ga,on of CO2 release caused by steam produc,on using, for example, natural gas.
Figure 4. Growth curves of E. coli in glucose-‐supplemented LB media. Data reflects one trial and was fit using a single exponen,al func,on.
Glucose Produc2on and Transport: We exploited the carbon fixa,on pathway that is naturally found in S. elongatus for glucose produc,on by introducing a set of genes encoding for proteins that will produce and transport glucose out of the cell. To do this, we implemented Invertase A (InvA) from Zymomonas mobilis that cleaves sucrose into glucose and fructose, as well as GalU that promotes an auxiliary pathway that results in addi,onal sucrose synthesis for enhanced glucose produc,on. For glucose transport, we will employ a Glf (glucose facilitator) protein that also originates from Z. mobilis and exports the intracellular glucose into the surrounding medium.
Figure 1. Growth of S. elongatus monitored by op,cal density at 750 nm, grown with and without aera,on provided by a CO2 bubbler. Data reflects one trial.
Ace2c Acid Produc2on: An E. coli chassis is integrated with an enhanced glucose dependent ace,c acid produc,on and transport system. Typically, extracellular glucose diffuses into the cell and is oxidized into pyruvate and converted to acetyl-‐CoA through glycolysis. However, the introduced ace,c acid module modifies this pathway by u,lizing the acetyl-‐CoA as a substrate for acetate produc,on. First, phosphotransacetylase (PTA) catalyzes the chemical reac,on of acetyl-‐CoA into acetyl-‐phosphate (acetyl-‐P). As a result of the rela,ve abundance of acetyl-‐P, acetate kinase (ACK) will convert acetyl-‐P into acetate. The membrane-‐bound ace,c acid transporter (Aata) then exports the acetate into the extracellular medium.
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Figure 2. 12% SDS-‐PAGE analysis of overexpression of ACK by E. coli. Lane numbers indicate ,me in hours ajer induc,on with IPTG; L indicates ladder. The expected size of ACK is 43 kDa, indicated by the red box. B00
10 B00
10
InvA K90
1000
B0034
Lac
I R0010
BBa_K901003
B0010
B00
10
GalU K
901004
B0034
Lac
I R0010
BBa_K901007
B0010
B00
10
ACK K90
1013
B0034
Lac
I R0010
BBa_K901015
References: 1. Hryhor, D. W. Emerging Solu,ons for Heavy Oil Produc,on from Carbonates. (TAMN Oil and Gas Corp., 2008).
AKribu2ons: Dr. George Oworim, University of Alberta, Department of Biological Sciences Dr. Igor Kovalchuk, University of Lethbridge, Department of Biological Sciences Mr. Brad Reamsbooom The Department of Chemistry and Biochemistry, University of Lethbridge BioAlberta
Parts SubmiKed:
116.0
45.0
35.0
25.0
18.4
66.2
MW, kDa 0 0.5 1 2 3 L
Time ajer induc,on (h)