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Structure of Porins

Structure of Porins

Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...

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Updated: Apr 21, 2026

Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior

Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior

Published on: March 8, 2024

Fullerenes generated from porous structures.

Ricardo Paupitz¹, Chad E Junkermeier, Adri C T van Duin

¹Departamento de Física, IGCE, Univ Estadual Paulista, UNESP, 13506-900, Rio Claro, SP, Brazil. paupitz@rc.unesp.br.

Physical Chemistry Chemical Physics : PCCP

|October 28, 2014

Summary

This summary is machine-generated.

New fullerene-like macromolecules built from graphene and biphenylene-carbon show high thermal stability up to 2500 K. Their porous nature suggests potential applications in gas storage and molecular encapsulation.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Area of Science:

Materials Science
Computational Chemistry
Nanotechnology

Background:

Fullerenes are a well-known class of carbon-based macromolecules with unique properties.
Two-dimensional materials like graphene and biphenylene-carbon offer novel structural possibilities.

Purpose of the Study:

To theoretically investigate a new class of fullerene-like macromolecules.
To explore the electronic and structural properties of these novel carbon structures.

Main Methods:

Density functional-based tight binding (DFTB) methods were employed.
Reactive molecular dynamics (MD) simulations were utilized.
Electronic and structural properties were analyzed.

Main Results:

Predicted high thermal stability for these structures, up to 2500 K.
Calculated atomization energies for carbon structures range from 0.45 to 12.11 eV/atom (relative to C60 fullerene).
Atomization energies for hexagonal boron nitride analogues range from -0.17 to 12.01 eV/atom (relative to B12N12 fullerene).

Conclusions:

The investigated fullerene-like macromolecules exhibit significant thermal stability.
Their inherent porosity makes them promising candidates for gas storage applications.
These novel structures may also be suitable for molecular encapsulation purposes.