skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Linking the Salmonella enterica 1,2-Propanediol Utilization Bacterial Microcompartment Shell to the Enzymatic Core via the Shell Protein PduB

Journal Article · · Journal of Bacteriology
DOI:https://doi.org/10.1128/jb.00576-21· OSTI ID:1980758

Bacterial microcompartments (MCPs) are protein-based organelles that house the enzymatic machinery for metabolism of niche carbon sources, allowing enteric pathogens to outcompete native microbiota during host colonization. While much progress has been made toward understanding MCP biogenesis, questions still remain regarding the mechanism by which core MCP enzymes are enveloped within the MCP protein shell. Here, we explore the hypothesis that the shell protein PduB is responsible for linking the shell of the 1,2-propanediol utilization (Pdu) MCP from Salmonella enterica serovar Typhimurium LT2 to its enzymatic core. Using fluorescent reporters, we demonstrate that all members of the Pdu enzymatic core are encapsulated in Pdu MCPs. We also demonstrate that PduB is critical for linking the entire Pdu enzyme core to the MCP shell. Using MCP purifications, transmission electron microscopy, and fluorescence microscopy, we find that shell assembly can be decoupled from the enzymatic core, as apparently empty MCPs are formed in Salmonella strains lacking PduB. Mutagenesis studies reveal that PduB is incorporated into the Pdu MCP shell via a conserved, lysine-mediated hydrogen bonding mechanism. Finally, growth assays and system-level pathway modeling reveal that unencapsulated pathway performance is strongly impacted by enzyme concentration, highlighting the importance of minimizing polar effects when conducting these functional assays. Together, these results provide insight into the mechanism of enzyme encapsulation within Pdu MCPs and demonstrate that the process of enzyme encapsulation and shell assembly are separate processes in this system, a finding that will aid future efforts to understand MCP biogenesis.

Research Organization:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); US Army Research Office (ARO); National Institutes of Health (NIH); National Science Foundation (NSF)
Grant/Contract Number:
SC0019337; W911NF-19-1-0298; DGE-1842165; T32GM008449
OSTI ID:
1980758
Journal Information:
Journal of Bacteriology, Vol. 204, Issue 9; ISSN 0021-9193
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

References (61)

The Plasticity of Molecular Interactions Governs Bacterial Microcompartment Shell Assembly journal May 2019
Bacterial microcompartments and the modular construction of microbial metabolism journal January 2015
A systems-level model reveals that 1,2-Propanediol utilization microcompartments enhance pathway flux through intermediate sequestration journal May 2017
Interactions between the termini of lumen enzymes and shell proteins mediate enzyme encapsulation into bacterial microcompartments journal August 2012
Decoding the stoichiometric composition and organisation of bacterial metabolosomes journal April 2020
The EMBL-EBI search and sequence analysis tools APIs in 2019 journal April 2019
The function of the PduJ microcompartment shell protein is determined by the genomic position of its encoding gene: Function of the PduJ microcompartment shell protein journal June 2016
The N Terminus of the PduB Protein Binds the Protein Shell of the Pdu Microcompartment to Its Enzymatic Core journal January 2017
Prokaryotic Organelles: Bacterial Microcompartments in E. coli and Salmonella journal March 2020
A single regulatory gene integrates control of vitamin B12 synthesis and propanediol degradation. journal April 1992
Bacterial microcompartments and their role in pathogenicity journal October 2021
Microcompartments for B12-Dependent 1,2-Propanediol Degradation Provide Protection from DNA and Cellular Damage by a Reactive Metabolic Intermediate journal February 2008
The control region of the pdu/cob regulon in Salmonella typhimurium. journal September 1994
The Propanediol Utilization (pdu) Operon ofSalmonella enterica Serovar Typhimurium LT2 Includes Genes Necessary for Formation of Polyhedral Organelles Involved in Coenzyme B12-Dependent 1,2-Propanediol Degradation † journal January 1999
A genomic integration platform for heterologous cargo encapsulation in 1,2-propanediol utilization bacterial microcompartments journal April 2020
Golden Gate Shuffling: A One-Pot DNA Shuffling Method Based on Type IIs Restriction Enzymes journal May 2009
The N-Terminal Region of the Medium Subunit (PduD) Packages Adenosylcobalamin-Dependent Diol Dehydratase (PduCDE) into the Pdu Microcompartment journal August 2011
Bacterial microcompartment shells of diverse functional types possess pentameric vertex proteins: Pentameric Structure of a Shell Protein from a Grp Microcompartment journal April 2013
A Survey of Bacterial Microcompartment Distribution in the Human Microbiome journal May 2021
Mechanisms of Scaffold-Mediated Microcompartment Assembly and Size Control journal March 2021
Exploring Bacterial Organelle Interactomes: A Model of the Protein-Protein Interaction Network in the Pdu Microcompartment journal February 2015
Genetic characterization of the pdu operon: use of 1,2-propanediol in Salmonella typhimurium. journal February 1997
A Taxonomy of Bacterial Microcompartment Loci Constructed by a Novel Scoring Method journal October 2014
Short N-terminal sequences package proteins into bacterial microcompartments journal March 2010
Structural Insights into Higher Order Assembly and Function of the Bacterial Microcompartment Protein PduA journal May 2014
Assembly principles and structure of a 6.5-MDa bacterial microcompartment shell journal June 2017
The PduL Phosphotransacylase Is Used To Recycle Coenzyme A within the Pdu Microcompartment journal May 2015
Assembly, function and evolution of cyanobacterial carboxysomes journal June 2016
Bacterial microcompartments journal March 2018
The PduM Protein Is a Structural Component of the Microcompartments Involved in Coenzyme B12-Dependent 1,2-Propanediol Degradation by Salmonella enterica journal February 2012
Formation and function of bacterial organelles journal July 2020
UCSF Chimera?A visualization system for exploratory research and analysis journal January 2004
NIH Image to ImageJ: 25 years of image analysis journal June 2012
Apparent size and morphology of bacterial microcompartments varies with technique journal March 2020
Structural Insight into the Mechanisms of Transport across the Salmonella enterica Pdu Microcompartment Shell journal September 2010
SciPy 1.0: fundamental algorithms for scientific computing in Python journal February 2020
A Reactivating Factor for Coenzyme B12-dependent Diol Dehydratase journal February 1999
The N-Terminal Regions of β and γ Subunits Lower the Solubility of Adenosylcobalamin-Dependent Diol Dehydratase journal January 2005
Selective molecular transport through the protein shell of a bacterial microcompartment organelle journal February 2015
Cargo encapsulation in bacterial microcompartments: Methods and analysis book January 2019
In situ reactivation of glycerol-inactivated coenzyme B12-dependent enzymes, glycerol dehydratase and diol dehydratase journal September 1980
Effect of metabolosome encapsulation peptides on enzyme activity, coaggregation, incorporation, and bacterial microcompartment formation journal February 2020
Biochemical evidence that the pduS gene encodes a bifunctional cobalamin reductase journal April 2005
A set of recombineering plasmids for gram-negative bacteria journal September 2006
Substrate channels revealed in the trimeric Lactobacillus reuteri bacterial microcompartment shell protein PduB journal November 2012
Characterisation of PduS, the pdu Metabolosome Corrin Reductase, and Evidence of Substructural Organisation within the Bacterial Microcompartment journal November 2010
Solution Structure of a Bacterial Microcompartment Targeting Peptide and Its Application in the Construction of an Ethanol Bioreactor journal November 2013
Magnetosome biogenesis in magnetotactic bacteria journal September 2016
Density-based binning of gene clusters to infer function or evolutionary history using GeneGrouper journal November 2021
Self-assembling Shell Proteins PduA and PduJ have Essential and Redundant Roles in Bacterial Microcompartment Assembly journal January 2021
Computational and Experimental Approaches to Controlling Bacterial Microcompartment Assembly journal April 2021
Synthesis of Empty Bacterial Microcompartments, Directed Organelle Protein Incorporation, and Evidence of Filament-Associated Organelle Movement journal April 2010
Engineering Transcriptional Regulation to Control Pdu Microcompartment Formation journal November 2014
The PduQ Enzyme Is an Alcohol Dehydrogenase Used to Recycle NAD+ Internally within the Pdu Microcompartment of Salmonella enterica journal October 2012
Employing bacterial microcompartment technology to engineer a shell-free enzyme-aggregate for enhanced 1,2-propanediol production in Escherichia coli journal July 2016
Origin and evolution of metabolic sub-cellular compartmentalization in eukaryotes journal December 2015
Jalview Version 2--a multiple sequence alignment editor and analysis workbench journal January 2009
A catalog of the diversity and ubiquity of bacterial microcompartments journal June 2021
Evidence for Improved Encapsulated Pathway Behavior in a Bacterial Microcompartment through Shell Protein Engineering journal June 2017
Protein Structures Forming the Shell of Primitive Bacterial Organelles journal August 2005
Bacterial microcompartments: tiny organelles with big potential journal October 2021