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Title: Functional metagenomic selection of ribulose 1, 5-bisphosphate carboxylase/oxygenase from uncultivated bacteria

Journal Article · · Environmental Microbiology
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6];  [6];  [4];  [1];  [1]
  1. The Ohio State Univ., Columbus, OH (United States). Dept. of Microbiology
  2. Botanical Research Inst. of Texas, Fort Worth,TX (United States)
  3. Univ. of Sao Paulo, Sao Paulo (Brazil). Dept. of Genetics, ESALQ
  4. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
  5. Univ. of California, Los Angeles, CA (United States). Protein Expression Technology Center, UCLA-DOE Inst.
  6. U.S. Geological Survey, Menlo Park, CA (United States)

Ribulose 1,5-bisphosphate carboxylase/oxygenase (RubisCO) is a critical yet severely inefficient enzyme that catalyses the fixation of virtually all of the carbon found on Earth. Here, we report a functional metagenomic selection that recovers physiologically active RubisCO molecules directly from uncultivated and largely unknown members of natural microbial communities. Selection is based on CO2-dependent growth in a host strain capable of expressing environmental deoxyribonucleic acid (DNA), precluding the need for pure cultures or screening of recombinant clones for enzymatic activity. Seventeen functional RubisCO-encoded sequences were selected using DNA extracted from soil and river autotrophic enrichments, a photosynthetic biofilm and a subsurface groundwater aquifer. Notably, three related form II RubisCOs were recovered which share high sequence similarity with metagenomic scaffolds from uncultivated members of the Gallionellaceae family. One of the Gallionellaceae Rubis COs was purified and shown to possess CO2/O2 specificity typical of form II enzymes. X-ray crystallography determined that this enzyme is a hexamer, only the second form II multimer ever solved and the first RubisCO structure obtained from an uncultivated bacterium. Functional metagenomic selection leverages natural biological diversity and billions of years of evolution inherent in environmental communities, providing a new window into the discovery of CO2-fixing enzymes not previously characterized.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH)
Grant/Contract Number:
AC02-05CH11231; FC02‐02ER63421
OSTI ID:
1471013
Journal Information:
Environmental Microbiology, Vol. 18, Issue 4; ISSN 1462-2912
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (5)

Engineering of a chromogenic enzyme screening system based on an auxiliary indole‐3‐carboxylic acid monooxygenase journal January 2019
Harnessing the power of microbial autotrophy journal September 2016
The evolving interface between synthetic biology and functional metagenomics journal July 2018
A load driver device for engineering modularity in biological networks journal November 2014
Unraveling RubisCO Form I and Form II Regulation in an Uncultured Organism from a Deep-Sea Hydrothermal Vent via Metagenomic and Mutagenesis Studies journal July 2017