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Title: Novel bacterial clade reveals origin of form I Rubisco

Journal Article · · Nature Plants (Online)
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [3];  [2]; ORCiD logo [6]; ORCiD logo [7]
  1. Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lancaster Univ. (United Kingdom)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of California, Berkeley, CA (United States)
  6. Univ. of California, Berkeley, CA (United States); Chan Zuckerberg Biohub, San Francisco, CA (United States)
  7. Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Joint BioEnergy Institute (JBEI), Emeryville, CA (United States)

Rubisco sustains the biosphere through the fixation of CO2 into biomass. In plants and cyanobacteria, form I Rubisco is structurally comprised of large and small subunits, whereas all other Rubisco forms lack small subunits. The rise of the form I complex through the innovation of small subunits represents a key, yet poorly understood, transition in Rubisco's evolution. Here, through metagenomic analyses, we discovered a previously uncharacterized clade sister to form I Rubisco that evolved without small subunits. This clade diverged before the evolution of cyanobacteria and the origin of the small subunit; thus, it provides a unique reference point to advance our understanding of form I Rubisco evolution. Structural and kinetic data presented here reveal how a proto-form I Rubisco assembled and functioned without the structural stability imparted from small subunits. Our findings provide insight into a key evolutionary transition of the most abundant enzyme on Earth and the predominant entry point for nearly all global organic carbon.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); USDOE Bioenergy Research Centers (BRC) (United States). Joint BioEnergy Inst. (JBEI)
Sponsoring Organization:
Allen Foundation; Biotechnology and Biological Sciences Research Council (BBSRC); Camille and Henry Dreyfus Foundation; Chan Zuckerberg Biohub; Innovative Genomics Institute; National Institute of General Medical Sciences (NIGMS); USDOE Office of Science (SC); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1782186
Journal Information:
Nature Plants (Online), Journal Name: Nature Plants (Online) Journal Issue: 9 Vol. 6; ISSN 2055-0278
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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