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Title: Unique organization and unprecedented diversity of the Bacteroides (Pseudobacteroides) cellulosolvens cellulosome system

Journal Article · · Biotechnology for Biofuels
 [1];  [1];  [1];  [2];  [3];  [4];  [5]; ORCiD logo [1]
  1. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Biomolecular Sciences
  2. Univ. of Tennessee, Knoxville, TN (United States). Graduate School of Genome Science and Technology; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)
  3. Univ. of Tennessee, Knoxville, TN (United States). Graduate School of Genome Science and Technology; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division, Energy and Environment Directorate
  4. Aix-Marseille Univ., and CNRS/IN2P3, Marseille (France). Architecture et Fonction des Macromolecules Biologiques
  5. Tel Aviv Univ., Ramat Aviv (Israel). Dept. of Molecular Microbiology and Biotechnology

The organization of the B. cellulosolvens cellulosome is unique compared to previously described cellulosome systems. In contrast to all other known cellulosomes, the cohesin types are reversed for all scaffoldins i.e., the type II cohesins are located on the enzyme-integrating primary scaffoldin, whereas the type I cohesins are located on the anchoring scaffoldins. Many of the type II dockerin-bearing ORFs include X60 modules, which are known to stabilize type II cohesin–dockerin interactions. In the present work, we focused on revealing the architectural arrangement of cellulosome structure in this bacterium by examining numerous interactions between the various cohesin and dockerin modules. In total, we cloned and expressed 43 representative cohesins and 27 dockerins. The results revealed various possible architectures of cell-anchored and cell-free cellulosomes, which serve to assemble distinctive cellulosome types via three distinct cohesin–dockerin specificities: type I, type II, and a novel-type designated R (distinct from type III interactions, predominant in ruminococcal cellulosomes). The results of this study provide novel insight into the architecture and function of the most intricate and extensive cellulosomal system known today, thereby extending significantly our overall knowledge base of cellulosome systems and their components. The robust cellulosome system of B. cellulosolvens, with its unique binding specificities and reversal of cohesin–dockerin types, has served to amend our view of the cellulosome paradigm. Revealing new cellulosomal interactions and arrangements is critical for designing high-efficiency artificial cellulosomes for conversion of plant-derived cellulosic biomass towards improved production of biofuels.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Israel Science Foundation (ISF); United States-Israel Binational Science Foundation (BSF); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC05-00OR22725; 2566/16; 1349
OSTI ID:
1394357
Journal Information:
Biotechnology for Biofuels, Vol. 10, Issue 1; ISSN 1754-6834
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (10)

Dual binding in cohesin-dockerin complexes: the energy landscape and the role of short, terminal segments of the dockerin module journal March 2018
Regulation of biomass degradation by alternative σ factors in cellulolytic clostridia journal July 2018
Changing surface grafting density has an effect on the activity of immobilized xylanase towards natural polysaccharides journal April 2019
Structural basis of oligosaccharide processing by glycosaminoglycan sulfotransferases journal June 2018
Inducing effects of cellulosic hydrolysate components of lignocellulose on cellulosome synthesis in Clostridium thermocellum journal June 2018
Creation of a functional hyperthermostable designer cellulosome journal February 2019
Unraveling essential cellulosomal components of the (Pseudo)Bacteroides cellulosolvens reveals an extensive reservoir of novel catalytic enzymes journal May 2019
Secretomic analyses of Ruminiclostridium papyrosolvens reveal its enzymatic basis for lignocellulose degradation journal July 2019
Pan-Cellulosomics of Mesophilic Clostridia: Variations on a Theme journal November 2017
The Cellulosome Paradigm in An Extreme Alkaline Environment journal September 2019