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Eukaryotic Compartmentalization01:37

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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In a multicellular organism, cells must communicate to work together in a coordinated manner. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Updated: May 29, 2025

A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
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Programming biological communication between distinct membraneless compartments.

Bo-Tao Ji1, He-Tong Pan1, Zhi-Gang Qian2

  • 1State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China.

Nature Chemical Biology
|February 5, 2025
PubMed
Summary
This summary is machine-generated.

Researchers created synthetic membraneless organelles that communicate and provide feedback. These programmable compartments can sense and deliver molecules, advancing synthetic biology and understanding cellular organization.

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Area of Science:

  • Synthetic biology
  • Cell biology
  • Biochemistry

Background:

  • Membraneless organelles are crucial for cellular functions but creating synthetic communicating ones remains a challenge.
  • Understanding the principles of membraneless organelle crosstalk is essential for designing complex cellular systems.

Purpose of the Study:

  • To engineer a binary population of synthetic membraneless compartments capable of communication and feedback.
  • To demonstrate programmable control over the assembly and function of these synthetic compartments.

Main Methods:

  • Utilized two orthogonally phase-separating proteins in a cell-free expression system to form compartment consortia.
  • Programmed the temporal and ordered appearance of compartments for controlled molecular delivery.
  • Implemented protease and DNA-based molecular messages to trigger sensing, processing, and delivery of protein cargo.
  • Integrated a feedback loop at the messenger RNA level to control information flow.

Main Results:

  • Successfully created coexisting membraneless compartments with biological communication and controllable feedback.
  • Demonstrated programmable, on-demand delivery of functional protein cargo in response to molecular cues.
  • Showcased DNA-based programming for sensing and processing information, including a feedback mechanism.
  • Established a design principle for constructing functional compartment consortia.

Conclusions:

  • The engineered compartment consortia represent a novel approach to creating biosynthetic communicating membraneless organelles.
  • These findings offer insights into the crosstalk mechanisms of natural membraneless organelles.
  • Provides a foundational design principle for building complex, functional synthetic cellular systems.