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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
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The Two Distinct Types of SecA2-Dependent Export Systems.

Miriam Braunstein1, Barbara A Bensing2, Paul M Sullam2

  • 1Department of Microbiology and Immunology, University of North Carolina-Chapel Hill, Chapel Hill, NC 27599.

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Gram-positive bacteria utilize two SecA2 systems for protein export: the accessory Sec (aSec) system for serine-rich repeat glycoproteins and multisubstrate systems for various proteins, expanding our understanding of bacterial transport diversity.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Gram-positive bacteria employ the general Sec system for protein export.
  • Many Gram-positive bacteria, including mycobacteria, also express SecA2, a distinct transport-associated ATPase.
  • SecA2 systems are classified into two mechanistically different types: accessory Sec (aSec) and multisubstrate systems.

Purpose of the Study:

  • To elucidate the mechanisms of the two distinct SecA2 systems in bacterial protein export.
  • To highlight the diversity of bacterial protein transport pathways.
  • To present current understanding of aSec and multisubstrate SecA2 system functions.

Main Methods:

  • Analysis of SecA2 system components and their roles in protein translocation.
  • Investigation of substrate targeting mechanisms for each SecA2 system type.
  • Comparative study of aSec systems (streptococci, staphylococci) and multisubstrate systems (mycobacteria, etc.).

Main Results:

  • The aSec system, involving SecY2 and accessory Sec proteins (Asps), specifically exports serine-rich repeat (SRR) glycoproteins via a specialized signal peptide.
  • Asp2 within the aSec system acetylates SRR domains during transport.
  • Multisubstrate SecA2 systems utilize the general SecYEG channel for exporting various substrates, with targeting influenced by mature protein structural features, potentially cytoplasmic folding.

Conclusions:

  • The discovery of aSec and multisubstrate SecA2 systems reveals significant diversity in bacterial protein export mechanisms.
  • SecA2 plays crucial roles beyond the general Sec system, facilitating specialized and broad-spectrum protein translocation.
  • Understanding these pathways is key to comprehending bacterial cell surface protein architecture and function.