textile industry monomer for the synthesis of polyesters
TRANSCRIPT
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1, 3-Propanediol production and screening
Sandeep AmetaRoll No.: 06530003
Bioschool, IIT Bombay
BT-612 Course Presentation
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Scheme of presentation
• Industrial aspect of 1,3-Propanediol production (1,3-PD)
• Strain development to increase production of 1,3-PD
• Paper:
“Novel Redox Potential-Based Screening Strategy for Rapid Isolation ofKlebsiella pneumoniae Mutants with Enhanced 1,3-Propanediol-Producing Capability”
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Industrial Aspect of Propanediol Production
Glycerol is a major by-product of industries involved in Biodiesel production
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Industrial Aspect of Propanediol Production
Glycerol is a major by-product of industries involved in Biodiesel production
Dihydroxyacetone : Cosmetic Industry
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Industrial Aspect of Propanediol Production
Glycerol is a major by-product of industries involved in Biodiesel production
Dihydroxyacetone : Cosmetic Industry
1,3-Propanediol : Textile Industry
Chemical Industry
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Industrial Aspect of Propanediol Production
Textile Industry Monomer for the synthesis of polyesters
PPT: polypropylene terephtalate
PET: polyethylene terephtalate
Better chemical, Mechanical &
biodegradability properties
Chemical Industry Polyurethane, lubricant, solvent and
precursor in the chemical and pharmaceutical
products
Drugs (derivative of 1,3-PD):
Ex: Famvir: Antiviral
Carisoprodol: For acute muscle
pain
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Scheme of presentation
• Industrial aspect of 1,3-Propanediol production (1,3-PD)
• Strain development to increase production of 1,3-PD
• Paper:
“Novel Redox Potential-Based Screening Strategy for Rapid Isolation ofKlebsiella pneumoniae Mutants with Enhanced 1,3-Propanediol-Producing Capability”
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Appl Microbiol Biotechnol , 1999 52:289
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Appl Microbiol Biotechnol 1999 , 52:289
glycerol dehydratase
oxidoreductas
e (
Mic
robia
l ro
ute
of
Pro
panedio
l B
iosy
nth
esi
s
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Improvement of Production
• The over expression enzyme: Glycerol dehydratase Limiting enzyme for 1,3-PD production
• Alternate Cheap substrate: Glucose
Bottleneck: Natural producers don’t have Glucose Propanediol pathway
Recombinant Approach: Heterologous expression of the 1,3-PD pathway genes
Process Approach: Mixed Fermentation
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Heterologous expression of the 1,3-PD pathway the genes
Expression of glycerol dehydratase andoxidoreductase genes in S. cerevisiae (Glycerol Producer)
Did not worked: Yield is 0.1g/L
Appl Microbiol Biotechnol 1999, 52:289
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Yeast (Glycerol Producer ) and Enterobacteriaceae (Glycerol to Propanediol producer)
in two consecutive stages.
Haynie and Wagner 1996, WO 35799 (E I DuPont de Nemours)
However, because of the repression of microbial 1,3-PD formation by glucose using
a yeast culture appears not to be very favorable.
Mixed Culture Approach
Recombinant E.coli with glycerol producing genes are used with K. pneumoniae as
a mixed culture for 1,3-Propanediol production.
Appl Microbiol Biotechnol 2002, 60:60
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Yeast (Glycerol Producer ) and Enterobacteriaceae (Glycerol to Propanediol producer)
in two consecutive stages.
Haynie and Wagner 1996, WO 35799 (E I DuPont de Nemours)
However, because of the repression of microbial 1,3-PD formation by glucose using
a yeast culture appears not to be very favorable.
Mixed Culture Approach
Appl Microbiol Biotechnol 2002, 60:60
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Scheme of presentation
• Industrial aspect of 1,3-Propanediol production (1,3-PD)
• Strain development to increase production of 1,3-PD
• Paper:
“Novel Redox Potential-Based Screening Strategy for Rapid Isolation ofKlebsiella pneumoniae Mutants with Enhanced 1,3-Propanediol-Producing Capability”
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Novel Redox Potential-Based Screening Strategy for Rapid Isolation
of Klebsiella pneumoniae Mutants with Enhanced 1,3-Propanediol
Producing Capability
Chenyu Du, Yanping Zhang, Yin Li and Zhu’an Cao
Applied and Environmental Microbiology 2007, p- 4515–4521
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The approaches used to screen for a metabolite hyper producer can
be generally categorized on the basis:
(i) a change in the absorption peak at a specific wavelength of either
the
target product or a derived compound
(ii) a change in the morphology of mutant colonies
(iii) resistance to extreme conditions such as acid, alkali, or
antibiotics
Screening of a hyper producer
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1,3-PD does not have specific absorbance peaks in the visible-UV range.
The chemical functional groups of 1,3-PD are highly similar to those of
the substrate, glycerol, and the by-products, such as ethanol, lactic acid,
and acetic acid.
Moreover, tolerance to 1,3-PD does not directly correlate with 1,3-PD
production.
Problems with 1, 3 PD screening
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ORP: (oxidoreduction potential) Screening
Recently, ORP has been used as a parameter to investigate mass and energymetabolic fluxes in several microorganisms
It has been reported that each species, has a preferred redox potential range.
Only within this range is maximum cell growth possible, and the flux may be directed toward the target metabolite.
In K. pneumoniae 1,3-PD production require anaerobic growth on glycerol.
Klebsiella pneumoniae M5aL , the most-preferred ORP levels were -160 to -190 mV.
Higher or lower ORP levels resulted in poor cell growth and poor 1,3-PD production.
J. Appl. Microbiol. 2003 94:280 FEMS Microbiol. Lett. 2002 214:257
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Results and discussion
Correlation of CDW and 1,3-PD production of the mutants
CDW cut off : 1.2g/L is chosen for screening
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Results and discussion
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Results and discussion
40 mutants with CWD is more than 1.2 g/LAverageParent
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Results and discussion
• The average 1,3-PD concentration was only 66.1% of that of the parent strain.
• Only 2 of the 67 mutants selected were recognized as positive mutants.
• Cell growth correlation is able to screen but the selection efficiency was not so high.
• The procedure of this method was very laborious.
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Results and discussion
Oxido-reduction Potential [ORP] Method of Screening
The most-preferred ORP levels of the parent strain: -160 to -190 mV.
Hypothesis: 1,3-PD is synthesized in the bio-reductive branch enhancing
the reductive reactions could improve 1,3-PD production.
ORP tolerance levels of -240 mV and -280 mV were selected to enhance
1,3-PD production.
The mutant colonies cultured in the 5-liter fermentor at an ORP of -240 mV
and -280 mV separately.
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Results and discussion
Oxido-reduction Potential [ORP] Method of Screening
The most-preferred ORP levels of the parent strain: -160 to -190 mV.
Hypothesis: 1,3-PD is synthesized in the bio-reductive branch enhancing
the reductive reactions could improve 1,3-PD production.
ORP tolerance levels of -240 mV and -280 mV were selected to enhance
1,3-PD production.
The mutant colonies cultured in the 5-liter fermentor at an ORP of -240 mV
and -280 mV separately.
Survived Colonies:
13 colonies with -240mV
11 colonies with -280mV Subjected to 36hr Anaerobic fermentation for
1,3-PD production
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Results and discussion
-240mV -280mV
13 Mutants 11 Mutants
Comparison of 1,3-PD production by the parent and mutant strains and the average of the isolated mutant strains by the ORP-based screening method
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Results and discussion
M5aL: Parent Strain
YC1: Mutant screened from CDW correlation method
YF1: Mutant screened from ORP -240mV
YMU1: Mutant screened from ORP -280mV
YMU2: Aldehyde dehydrogenase Mutant (Previous Work) at ORP -280mV
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Results and discussion
M5aL: Parent Strain
YC1: 5.5 % Increase
YF1: 22.5 % Increase
YMU1: 30.5 % Increase
YMU2: 25.2 % Increase
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Results and discussion
Preferred ORP range of K. pneumoniae YMU1
As mutant strain K. pneumoniae YMU1 was at -280mV may differ from
that of the parent strain in its preferred ORP range.
To check the preferred ORP of K. pneumoniae YMU1:
Fed-batch fermentations of K. pneumoniae YMU1 were carried out at
constant ORPs of -190 mV, -240 mV, -280 mV, -320 mV
separately.
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Results and discussion
Preferred ORP range of K. pneumoniae YMU1
As mutant strain K. pneumoniae YMU1 was at -280mV may differ from
that of the parent strain in its preferred ORP range.
To check the preferred ORP of K. pneumoniae YMU1:
Fed-batch fermentations of K. pneumoniae YMU1 were carried out at
constant ORPs of -190 mV, 240 mV, 280 mV, 320 mV
separately.
-280mV
-240mV
-320mVParent
- 190mV
Conclusion: -280mV is the preferable ORP for the mutants
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Results and discussion
Change in the intracellular NAD/NADH ratio
To verify the change in intracellular redox potential, the time courses of the intracellular NAD/NADH ratio of the parent strain and the mutant strain were investigated
NAD/NADH ratio:
Parent: 4
Muatnt:2
Parent
Mutant
Thus intracellular environment is more reductive
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Results and discussion
Metabolic-flux analysis of mutant strain K. pneumoniaeYMU1 at-280mV ORP
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Results and discussion
Metabolic-flux analysis of mutant strain K. pneumoniaeYMU1 at-280mV ORP
• Acetate production is decreased Acetate is one of the strongest K. pneumoniae cell growth inhibitors Annu Rev Microbiol 1976, 36:535
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Results and discussion
Metabolic-flux analysis of mutant strain K. pneumoniaeYMU1 at-280mV ORP
• Acetate production is decreased Acetate is one of the strongest K. pneumoniae cell growth inhibitors Annu Rev Microbiol 1976, 36:535
• 2,3 Butanediol Production increased Bio-reductive branch enhanced
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Results and discussion
Metabolic-flux analysis of mutant strain K. pneumoniaeYMU1 at-280mV ORP
• Acetate production is decreased Acetate is one of the strongest K. pneumoniae cell growth inhibitors. Annu Rev Microbiol 1976, 36:535
• 2,3 Butanediol Production increased Bio-reductive branch enhanced
• 1,3 PD production increased
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Conclusion
A positive correlation between the CDW of K. pneumoniae and its 1,3-PD biosyn-thesis was observed.
Cell growth correlation screening method was not efficient: 2 out of 67
ORP method shown a increased efficiency: 4 out of 11
The preferred ORP range of the mutant shifted from around -190 mV to -280 mV.
The redistribution of metabolic flux of the mutant strain, with the altered environmental conditions (an ORP of -280 mV), resulted in a decreased intracellular NAD/NADH ratio, which might enhance the activity of 1,3-PD dehydrogenase and consequently accelerate 1,3-PD production.
Thus the bioconversion steps in the reductive branch was improved in isolated mutant strain K. pneumoniae YMU1.
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Thank you!!!!