6X8T

CryoEM structure of the apo-SrpI encapasulin complex from Synechococcus elongatus PCC 7942


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Discovery and characterization of a novel family of prokaryotic nanocompartments involved in sulfur metabolism.

Nichols, R.J.LaFrance, B.Phillips, N.R.Radford, D.R.Oltrogge, L.M.Valentin-Alvarado, L.E.Bischoff, A.J.Nogales, E.Savage, D.F.

(2021) Elife 10

  • DOI: 10.7554/eLife.59288
  • Primary Citation of Related Structures:  
    6X8T, 6X8M

  • PubMed Abstract: 
  • Prokaryotic nanocompartments, also known as encapsulins, are a recently discovered proteinaceous organelle-like compartment in prokaryotes that compartmentalize cargo enzymes. While initial studies have begun to elucidate the structure and physiological roles of encapsulins, bioinformatic evidence suggests that a great diversity of encapsulin nanocompartments remains unexplored ...

    Prokaryotic nanocompartments, also known as encapsulins, are a recently discovered proteinaceous organelle-like compartment in prokaryotes that compartmentalize cargo enzymes. While initial studies have begun to elucidate the structure and physiological roles of encapsulins, bioinformatic evidence suggests that a great diversity of encapsulin nanocompartments remains unexplored. Here, we describe a novel encapsulin in the freshwater cyanobacterium Synechococcus elongatus PCC 7942. This nanocompartment is upregulated upon sulfate starvation and encapsulates a cysteine desulfurase enzyme via an N-terminal targeting sequence. Using cryo-electron microscopy, we have determined the structure of the nanocompartment complex to 2.2 Å resolution. Lastly, biochemical characterization of the complex demonstrated that the activity of the cysteine desulfurase is enhanced upon encapsulation. Taken together, our discovery, structural analysis, and enzymatic characterization of this prokaryotic nanocompartment provide a foundation for future studies seeking to understand the physiological role of this encapsulin in various bacteria.


    Related Citations: 
    • Discovery and characterization of a novel family of prokaryotic nanocompartments involved in sulfur metabolism
      Nichols, R.J., LaFrance, B.J., Phillips, N.R., Oltrogge, L.M., Valentin-Alvarado, L.E., Bischoff, A.J., Nogales, E., Savage, D.F.
      (2020) Biorxiv --: --

    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein SrpIA314Synechococcus elongatus PCC 7942 = FACHB-805Mutation(s): 0 
Gene Names: srpISynpcc7942_B2662pANL38
Find proteins for Q55032 (Synechococcus elongatus (strain PCC 7942 / FACHB-805))
Explore Q55032 
Go to UniProtKB:  Q55032
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of Energy (DOE, United States)United StatesDE- 638 SC00016240
National Science Foundation (NSF, United States)United States1106400

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-10
    Type: Initial release
  • Version 1.1: 2021-04-21
    Changes: Database references