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Structure and Function of a Bacterial Microcompartment Shell Protein Engineered to Bind a [4Fe-4S] Cluster

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b11734· OSTI ID:1713208
 [1];  [2];  [3];  [4];  [4];  [4];  [4];  [4];  [5];  [6];  [7]
  1. Michigan State Univ., East Lansing, MI (United States). MSU DOE Plant Research Lab.; MSU DOE Plant Research lab
  2. Pennsylvania State Univ., University Park, PA (United States)
  3. Michigan State Univ., East Lansing, MI (United States). MSU DOE Plant Research Lab.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Michigan State Univ., East Lansing, MI (United States). MSU DOE Plant Research Lab.
  5. Michigan State Univ., East Lansing, MI (United States)
  6. Brooklyn College, Brooklyn, NY (United States)
  7. Michigan State Univ., East Lansing, MI (United States). MSU DOE Plant Research Lab.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Berkeley Synthetic Biology Inst., Berkeley, CA (United States)
Bacterial microcompartments (BMCs) are self-assembling organelles composed of a selectively permeable protein shell and encapsulated enzymes. They are considered promising templates for the engineering of designed bionanoreactors for biotechnology. In particular, encapsulation of oxidoreductive reactions requiring electron transfer between the lumen of the BMC and the cytosol relies on the ability to conduct electrons across the shell. We determined the crystal structure of a component protein of a synthetic BMC shell, which informed the rational design of a [4Fe-4S] cluster-binding site in its pore. Here, we also solved the structure of the [4Fe-4S] cluster-bound, engineered protein to 1.8 Å resolution, providing the first structure of a BMC shell protein containing a metal center. The [4Fe-4S] cluster was characterized by optical and EPR spectroscopies; it has a reduction potential of -370 mV vs the standard hydrogen electrode (SHE) and is stable through redox cycling. This remarkable stability may be attributable to the hydrogen-bonding network provided by the main chain of the protein scaffold. The properties of the [4Fe-4S] cluster resemble those in low-potential bacterial ferredoxins, while its ligation to three cysteine residues is reminiscent of enzymes such as aconitase and radical S-adenosymethionine (SAM) enzymes. This engineered shell protein provides the foundation for conferring electron-transfer functionality to BMC shells.
Research Organization:
Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-91ER20021
OSTI ID:
1713208
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 16 Vol. 138; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Engineering formation of multiple recombinant Eut protein nanocompartments in E. coli journal April 2016
Glycyl Radical Enzyme-Associated Microcompartments: Redox-Replete Bacterial Organelles journal January 2019
Bacterial microcompartments: catalysis-enhancing metabolic modules for next generation metabolic and biomedical engineering journal October 2019
Connecting Structure–Property and Structure–Function Relationships across the Disciplines of Chemistry and Biology: Exploring Student Perceptions journal June 2018
Functionalization of Bacterial Microcompartment Shell Proteins With Covalently Attached Heme journal January 2020
Rational design of a hexameric protein assembly stabilized by metal chelation journal September 2018
Encapsulation of multiple cargo proteins within recombinant Eut nanocompartments journal July 2016
Bacterial microcompartments journal March 2018
The multicatalytic compartment of propionyl-CoA synthase sequesters a toxic metabolite journal October 2018
Functional protein shells fabricated from the self-assembling protein sheets of prokaryotic organelles journal January 2020
Bio-engineering of bacterial microcompartments: a mini review journal June 2019
Engineering the PduT shell protein to modify the permeability of the 1,2-propanediol microcompartment of Salmonella journal December 2019
Assembly principles and structure of a 6.5-MDa bacterial microcompartment shell journal June 2017
Bacterial Microcompartments journal January 2007
Bacterial Microcompartments journal October 2010
Rational Design of Artificial Metalloproteins and Metalloenzymes with Metal Clusters journal July 2019

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