Encapsulation mechanisms and structural studies of GRM2 bacterial microcompartment particles

Bacterial microcompartments (BMCs) are prokaryotic organelles consisting of a protein shell and an encapsulated enzymatic core. BMCs are involved in several biochemical processes, such as choline, glycerol and ethanolamine degradation and carbon fixation. Since non-native enzymes can also be encapsu...

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Published in:Nature communications Vol. 11; no. 1; pp. 388 - 13
Main Authors: Kalnins, Gints, Cesle, Eva-Emilija, Jansons, Juris, Liepins, Janis, Filimonenko, Anatolij, Tars, Kaspars
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 20.01.2020
Nature Publishing Group
Nature Portfolio
Subjects:
101/28
45/77
631/326/41/2536
631/326/88
631/535/1258/1259
82/16
82/83
Bacteria
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
Biodegradation
Carbon fixation
Choline
Choline - metabolism
Cryoelectron Microscopy
Encapsulation
Enzymes
Ethanolamine
Gene expression
Genetic Loci
Glycerol
Humanities and Social Sciences
Icosahedral phase
Klebsiella
Klebsiella pneumoniae
Klebsiella pneumoniae - cytology
Klebsiella pneumoniae - enzymology
Klebsiella pneumoniae - genetics
Klebsiella pneumoniae - ultrastructure
Lyases - genetics
Lyases - metabolism
multidisciplinary
Organelles
Organelles - enzymology
Organelles - ultrastructure
Proteins
Recombinant Proteins - genetics
Recombinant Proteins - metabolism
Science
Science (multidisciplinary)
Synthetic Biology
ISSN:2041-1723, 2041-1723
Online Access:Get full text
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Summary:Bacterial microcompartments (BMCs) are prokaryotic organelles consisting of a protein shell and an encapsulated enzymatic core. BMCs are involved in several biochemical processes, such as choline, glycerol and ethanolamine degradation and carbon fixation. Since non-native enzymes can also be encapsulated in BMCs, an improved understanding of BMC shell assembly and encapsulation processes could be useful for synthetic biology applications. Here we report the isolation and recombinant expression of BMC structural genes from the Klebsiella pneumoniae GRM2 locus, the investigation of mechanisms behind encapsulation of the core enzymes, and the characterization of shell particles by cryo-EM. We conclude that the enzymatic core is encapsulated in a hierarchical manner and that the CutC choline lyase may play a secondary role as an adaptor protein. We also present a cryo-EM structure of a pT = 4 quasi-symmetric icosahedral shell particle at 3.3 Å resolution, and demonstrate variability among the minor shell forms. Bacterial microcompartments (BMCs) consist of a protein shell and an encapsulated enzymatic core. Here, Kalnins et al. study a BMC from Klebsiella pneumoniae , show that the enzymatic core is encapsulated in a hierarchical manner, and solve the cryo-EM structure of a pT = 4 quasi-symmetric icosahedral shell particle.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-019-14205-y