Comparative analysis of the ability of Clostridium clariflavum strains and Clostridium thermocellum to utilize hemicellulose and unpretreated plant material

Biotechnology for Biofuels

Javier A Izquierdo¹  Sivakumar Pattathil²  Anna Guseva³  Michael G Hahn²  Lee R Lynd³ 

[1] Department of Biology, Hofstra University, Hempstead, NY, USA

[2] Complex Carbohydrate Research Center, University of Georgia, Athens, GA, USA

[3] BioEnergy Science Center Oak Ridge National Laboratory Oak Ridge, Oak Ridge, TN, USA

关键词: Switchgrass;    Hemicellulose;    Clostridium clariflavum;    Clostridium thermocellum;    CBP;   

Others  :  1084289
DOI  :  10.1186/s13068-014-0136-4

 received in 2014-06-05, accepted in 2014-09-03,  发布年份 2014

【 摘 要 】

Background

Among themophilic consolidated bioprocessing (CBP) candidate organisms, environmental isolates of Clostridium clariflavum have demonstrated the ability to grow on xylan, and the genome of C. clariflavum DSM 19732 has revealed a number of mechanisms that foster solubilization of hemicellulose that are distinctive relative to the model cellulolytic thermophile Clostridium thermocellum.

Results

Growth experiments on xylan, xylooligosaccharides, and xylose reveal that C. clariflavum strains are able to completely break down xylan to xylose and that the environmental strain C. clariflavum sp. 4-2a is able to grow on monomeric xylose. C. clariflavum strains were able to utilize a larger proportion of unpretreated switchgrass, and solubilize a higher proportion of glucan, xylan, and arabinan, with strain 4-2a reaching the highest extent of solubilization of these components (64.7 to 69.4%) compared to C. thermocellum (29.5 to 42.5%). In addition, glycome immunoanalyses of residual plant biomass reveal differences in the extent of degradation of easily accessible xylans, with C. clariflavum strains having increased solubilization of this fraction of xylans relative to C. thermocellum.

Conclusions

C. clariflavum strains exhibit higher activity than C. thermocellum in the breakdown of hemicellulose and are capable of degrading xylan to xylooligomers and xylose. This capability seems to also play a role in the higher levels of utilization of unpretreated plant material.

【 授权许可】

   
2014 Izquierdo et al.; licensee BioMed Central Ltd.

【 图 表 】

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