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Title: Development of a Rhodobacter capsulatus self-reporting model system for optimizing light-dependent, [FeFe]-hydrogenase-driven H2 production

Journal Article · · Biotechnology and Bioengineering
DOI:https://doi.org/10.1002/bit.26076· OSTI ID:1339249
 [1];  [2];  [2];  [3]
  1. GeneBiologics, LLC, Boulder, CO (United States)
  2. United States Air Force Academy, Colorado Springs, CO (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)

ABSTRACT The photosynthetic bacterium Rhodobacter capsulatus normally photoproduces H 2 as a by‐product of its nitrogenase‐catalyzed nitrogen‐fixing activity. Such H 2 production, however, is expensive from a metabolic perspective, requiring nearly four times as many photons as the equivalent algal hydrogenase‐based system (Ghirardi et al., 2009 Photobiological hydrogen‐producing systems. Chem Soc Rev 38(1):52–61). Here, we report the insertion of a Clostridium acetobutylicum [FeFe]‐hydrogenase and its three attendant hydrogenase assembly proteins into an R. capsulatus strain lacking its native uptake hydrogenase. Further, this strain is modified to fluoresce upon sensing H 2 . The resulting strain photoproduces H 2 and self‐reports its own H 2 production through fluorescence. This model system represents a unique method of developing hydrogenase‐based H 2 production in R. capsulatus , may serve as a powerful system for in vivo directed evolution of hydrogenases and hydrogenase‐associated genes, and provides a means of screening for increased metabolic production of H 2 . Biotechnol. Bioeng. 2017;114: 291–297. © 2016 Wiley Periodicals, Inc.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1339249
Alternate ID(s):
OSTI ID: 1400579
Report Number(s):
NREL/JA-2700-66611
Journal Information:
Biotechnology and Bioengineering, Vol. 114, Issue 2; ISSN 0006-3592
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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