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Title: Structural Characterization of a Newly Identified Component of α-Carboxysomes: The AAA+ Domain Protein CsoCbbQ

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep16243· OSTI ID:1256062
 [1];  [2];  [3];  [2];  [2];  [2];  [2];  [2];  [4]
  1. Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of Southern Mississippi, Hattiesburg, MS (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Michigan State Univ., East Lansing, MI (United States). Dept. of Biochemistry and Molecular Biology

Carboxysomes are bacterial microcompartments that enhance carbon fixation by concentrating ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) and its substrate CO2 within a proteinaceous shell. They are found in all cyanobacteria, some purple photoautotrophs and many chemoautotrophic bacteria. Carboxysomes consist of a protein shell that encapsulates several hundred molecules of RuBisCO, and contain carbonic anhydrase and other accessory proteins. Genes coding for carboxysome shell components and the encapsulated proteins are typically found together in an operon. The α-carboxysome operon is embedded in a cluster of additional, conserved genes that are presumably related to its function. In many chemoautotrophs, products of the expanded carboxysome locus include CbbO and CbbQ, a member of the AAA+ domain superfamily. We bioinformatically identified subtypes of CbbQ proteins and show that their genes frequently co-occur with both Form IA and Form II RuBisCO. The α-carboxysome-associated ortholog, CsoCbbQ, from Halothiobacillus neapolitanus forms a hexamer in solution and hydrolyzes ATP. The crystal structure shows that CsoCbbQ is a hexamer of the typical AAA+ domain; the additional C-terminal domain, diagnostic of the CbbQ subfamily, structurally fills the inter-monomer gaps, resulting in a distinctly hexagonal shape. Finally, we show that CsoCbbQ interacts with CsoCbbO and is a component of the carboxysome shell, the first example of ATPase activity associated with a bacterial microcompartment.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
FG02-91ER20021; AC02-05CH11231; MCB-1244534
OSTI ID:
1256062
Alternate ID(s):
OSTI ID: 1415945
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (13)

Carboxysome encapsulation of the CO2-fixing enzyme Rubisco in tobacco chloroplasts journal September 2018
Insights into the mechanism and regulation of the CbbQO-type Rubisco activase, a MoxR AAA+ ATPase journal December 2019
Bacterial microcompartments journal March 2018
Bacterial Microcompartments journal October 2010
Progress and challenges of engineering a biophysical CO2-concentrating mechanism into higher plants journal April 2017
Assembly–disassembly is coupled to the ATPase cycle of tobacco Rubisco activase journal October 2018
Cyanobacterial carboxysomes contain an unique rubisco‐activase‐like protein journal October 2019
Bacterial Microcompartments journal January 2007
Carboxysomes: metabolic modules for CO2 fixation journal August 2017
Permanent draft genome of Thiobacillus thioparus DSM 505T, an obligately chemolithoautotrophic member of the Betaproteobacteria journal January 2017
From chaperonins to Rubisco assembly and metabolic repair: Role of Chaperones in Rubisco Biogenesis journal October 2017
The Diverse AAA+ Machines that Repair Inhibited Rubisco Active Sites journal May 2017
Rubisco Activases: AAA+ Chaperones Adapted to Enzyme Repair journal April 2017

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