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Related Concept Videos

Structure of Porins01:21

Structure of Porins

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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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Porin Insertion in the Outer Mitochondrial Membrane01:12

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
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Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
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Leaky Scanning02:28

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
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Mechanical Protein Function01:58

Mechanical Protein Function

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From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins
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Decoding Outer Membrane β-Barrels: From Structural Curiosity to Engineered Nanotherapeutics.

Radhakrishnan Mahalakshmi1

  • 1Mitochondrial Networks and Disease Laboratory, School of Interwoven Arts and Sciences, Krea University, 5655, Central Expressway, Sri City, Andhra Pradesh 517646, India.

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Summary
This summary is machine-generated.

Outer membrane proteins (OMPs) are crucial gatekeepers in various organisms. Advances in technology reveal their complex structures and functions, paving the way for novel therapeutics and precision interventions.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Structural Biology
  • Cell Biology

Background:

  • Outer membrane proteins (OMPs) act as molecular gatekeepers in Gram-negative bacteria, mitochondria, and chloroplasts.
  • They perform diverse functions including signal transduction, transport, adhesion, and protein biogenesis.
  • OMPs are vital molecular scaffolds regulating cellular homeostasis and organismal fate.

Purpose of the Study:

  • To review the discovery, structure, and function of OMPs.
  • To integrate insights on OMP biogenesis, energetics, and regulation.
  • To highlight the therapeutic and biotechnological applications of engineered OMPs.

Main Methods:

  • Review of scientific literature and early studies on OMP structures and folding.
  • Integration of data from advanced techniques like cryo-EM, NMR, MD simulations, and AlphaFold.
  • Analysis of OMP interactomes and in vivo functions.

Main Results:

  • OMPs exhibit remarkable structural versatility and functional dynamism.
  • Recent technological advances have provided unprecedented insights into OMP biogenesis, energetics, and regulation.
  • Engineered OMPs show promise in biosensing, drug delivery, diagnostics, synthetic biology, and nanomedicine.

Conclusions:

  • OMPs are critical for cellular functions and hold significant potential for therapeutic and biotechnological applications.
  • Understanding OMP structure-function relationships is key to precision biomolecular design.
  • OMPs are transitioning from structural curiosities to platforms for next-generation nanotherapeutics.