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Title: A global analysis of gene expression in Fibrobacter succinogenes S85 grown on cellulose and soluble sugars at different growth rates

Abstract

Cellulose is the most abundant biological polymer on earth, making it an attractive substrate for the production of next-generation biofuels and commodity chemicals. However, the economics of cellulose utilization are currently unfavorable due to a lack of efficient methods for its hydrolysis. Fibrobacter succinogenes strain S85, originally isolated from the bovine rumen, is among the most actively cellulolytic mesophilic bacteria known, producing succinate as its major fermentation product. In this study, we examined the transcriptome of F. succinogenes S85 grown in continuous culture at several dilution rates on cellulose, cellobiose, or glucose to gain a system-level understanding of cellulose degradation by this bacterium. Several patterns of gene expression were observed for the major cellulases produced by F. succinogenes S85. A large proportion of cellulase genes were constitutively expressed, including the gene encoding for Cel51A, the major cellulose-binding endoglucanase produced by this bacterium. Moreover, other cellulase genes displayed elevated expression during growth on cellulose relative to growth on soluble sugars. Growth rate had a strong effect on global gene expression, particularly with regard to genes predicted to encode carbohydrate-binding modules and glycoside hydrolases implicated in hemicellulose degradation. Expression of hemicellulase genes was tightly regulated, with these genes displaying elevated expression onlymore » during slow growth on soluble sugars. Clear differences in gene expression were also observed between adherent and planktonic populations within continuous cultures growing on cellulose. This work emphasizes the complexity of the fiber-degrading system utilized by F. succinogenes S85, and reinforces the complementary role of hemicellulases for accessing cellulose by these bacteria. We report for the first time evidence of global differences in gene expression between adherent and planktonic populations of an anaerobic bacterium growing on cellulose at steady state during continuous cultivation. Lastly, our results also highlight the importance of controlling for growth rate in investigations of gene expression.« less

Authors:
; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1618750
Alternate Identifier(s):
OSTI ID: 1483933
Grant/Contract Number:  
AC02-05CH11231; SC0008104
Resource Type:
Journal Article: Published Article
Journal Name:
Biotechnology for Biofuels
Additional Journal Information:
Journal Name: Biotechnology for Biofuels Journal Volume: 11 Journal Issue: 1; Journal ID: ISSN 1754-6834
Publisher:
Springer Science + Business Media
Country of Publication:
Netherlands
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Fibrobacter succinogenes S85; Cellulose; Plant cell wall polysaccharide; RNA-Seq; Gene expression; Cellulase; Hemicellulase

Citation Formats

Neumann, Anthony P., Weimer, Paul J., and Suen, Garret. A global analysis of gene expression in Fibrobacter succinogenes S85 grown on cellulose and soluble sugars at different growth rates. Netherlands: N. p., 2018. Web. doi:10.1186/s13068-018-1290-x.
Neumann, Anthony P., Weimer, Paul J., & Suen, Garret. A global analysis of gene expression in Fibrobacter succinogenes S85 grown on cellulose and soluble sugars at different growth rates. Netherlands. https://doi.org/10.1186/s13068-018-1290-x
Neumann, Anthony P., Weimer, Paul J., and Suen, Garret. 2018. "A global analysis of gene expression in Fibrobacter succinogenes S85 grown on cellulose and soluble sugars at different growth rates". Netherlands. https://doi.org/10.1186/s13068-018-1290-x.
@article{osti_1618750,
title = {A global analysis of gene expression in Fibrobacter succinogenes S85 grown on cellulose and soluble sugars at different growth rates},
author = {Neumann, Anthony P. and Weimer, Paul J. and Suen, Garret},
abstractNote = {Cellulose is the most abundant biological polymer on earth, making it an attractive substrate for the production of next-generation biofuels and commodity chemicals. However, the economics of cellulose utilization are currently unfavorable due to a lack of efficient methods for its hydrolysis. Fibrobacter succinogenes strain S85, originally isolated from the bovine rumen, is among the most actively cellulolytic mesophilic bacteria known, producing succinate as its major fermentation product. In this study, we examined the transcriptome of F. succinogenes S85 grown in continuous culture at several dilution rates on cellulose, cellobiose, or glucose to gain a system-level understanding of cellulose degradation by this bacterium. Several patterns of gene expression were observed for the major cellulases produced by F. succinogenes S85. A large proportion of cellulase genes were constitutively expressed, including the gene encoding for Cel51A, the major cellulose-binding endoglucanase produced by this bacterium. Moreover, other cellulase genes displayed elevated expression during growth on cellulose relative to growth on soluble sugars. Growth rate had a strong effect on global gene expression, particularly with regard to genes predicted to encode carbohydrate-binding modules and glycoside hydrolases implicated in hemicellulose degradation. Expression of hemicellulase genes was tightly regulated, with these genes displaying elevated expression only during slow growth on soluble sugars. Clear differences in gene expression were also observed between adherent and planktonic populations within continuous cultures growing on cellulose. This work emphasizes the complexity of the fiber-degrading system utilized by F. succinogenes S85, and reinforces the complementary role of hemicellulases for accessing cellulose by these bacteria. We report for the first time evidence of global differences in gene expression between adherent and planktonic populations of an anaerobic bacterium growing on cellulose at steady state during continuous cultivation. Lastly, our results also highlight the importance of controlling for growth rate in investigations of gene expression.},
doi = {10.1186/s13068-018-1290-x},
url = {https://www.osti.gov/biblio/1618750}, journal = {Biotechnology for Biofuels},
issn = {1754-6834},
number = 1,
volume = 11,
place = {Netherlands},
year = {Sat Oct 27 00:00:00 EDT 2018},
month = {Sat Oct 27 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1186/s13068-018-1290-x

Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

Figures / Tables:

Table 1 Table 1: Culture summary statistics

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journal, November 2019


Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.