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Bacterial Protein Maturation

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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Cytosolic selection systems to study protein stability.

Ajamaluddin Malik1, Antje Mueller-Schickert1, James C A Bardwell2

  • 1Howard Hughes Medical Institute, Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, Michigan, USA.

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|October 1, 2014
PubMed
Summary

Scientists developed novel biosensors to measure protein stability in prokaryotic cells. This system links protein behavior to antibiotic resistance, enabling in vivo analysis without prior knowledge of protein structure or function.

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Biochemistry

Background:

  • Protein stability and aggregation are crucial for cellular function.
  • Assessing protein behavior in vivo, particularly in prokaryotes, presents challenges.
  • Existing methods often require prior knowledge of protein structure or function.

Purpose of the Study:

  • To develop novel biosensors for in vivo protein stability assessment in prokaryotic cytosol.
  • To link protein stability and aggregation to cellular antibiotic resistance.
  • To enable functional analysis of protein behavior without prior structural information.

Main Methods:

  • Constructed tripartite sandwich fusion biosensors.
  • Linked guest protein stability/aggregation to host cell resistance against kanamycin, spectinomycin, and nourseothricin.
  • Quantified antibiotic resistance as a readout for protein behavior.

Main Results:

  • Mutations affecting guest protein stability correlated with altered antibiotic resistance.
  • Increasing polyglutamine tract length enhanced in vivo amyloid formation and decreased aminoglycoside antibiotic resistance.
  • Demonstrated in vivo analysis of protein stability in the cytosolic compartment.

Conclusions:

  • The developed biosensors provide a robust method for in vivo protein stability analysis in prokaryotes.
  • This system allows for the study of protein aggregation and its cellular consequences.
  • The approach is versatile and does not require prior knowledge of protein structure or function.