3-12: Mining Dictyoglomus turgidum for enzymatically active carbohydrases

Monday, April 19, 2010
LL Conference Facility (Hilton Clearwater Beach)
Phillip J. Brumm1, Spencer Hermanson1, Becky Hochstein2, Julie Boyum3, Nick Hermersmann3, Krishne Gowda3 and David Mead3, (1)C5-6 Technologies and Great Lakes Bioenergy Research Center, Middleton, WI, (2)Montana State University, Bozeman, MT, (3)Lucigen and Great Lakes Bioenergy Research Center, Middleton, WI

Dictyoglomus species represent a novel group of thermophilic, anaerobic organisms with considerable biotechnological promise; these organisms are so unique that they have been given their own genus, Dictoglomi. Dictyoglomus turgidum is an anaerobic, thermophile able to degrade a wide range of biomass components including starch, cellulose, pectin and lignin. The broad range of substrate utilization is reflected in the high percentage of CAZymes present in the genome, 2.35% of its total genes, higher than the percentage present in the cellulose-degrading, thermophilc anaerobe, Clostridium thermocellum, with 2.2% of its total genes.  This apparent strong degradation capacity, coupled with the uniqueness of the organism, suggested that D. turgidum would be an excellent source of new and novel biomass-degrading enzymes. Screening of a random clone library generated from D. turgidum resulted in the discovery of several novel biomass-degrading enzymes with low homology to known molecules. Whole genome sequencing of the organism followed by bioinformatics-directed amplification of selected genes resulted in the recovery of additional novel enzyme molecules.