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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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Extracellular small heat shock proteins: exosomal biogenesis and function.

V Sudhakar Reddy1, Satish K Madala2, Jamma Trinath3

  • 1Biochemistry Division, National Institute of Nutrition, Tarnaka, Jamai-Osmania, Hyderabad, 500007, India. sudhakarnin@gmail.com.

Cell Stress & Chaperones
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Small heat shock proteins (sHsps) are found outside cells, acting in cell communication and immune responses. Their non-classical secretion via exosomes suggests therapeutic potential in disease models.

Keywords:
ExosomesExportPlasmaSmall heat shock proteins

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Immunology

Background:

  • Small heat shock proteins (sHsps) are typically intracellular chaperones.
  • Recent findings reveal extracellular sHsps in pathological conditions.
  • This suggests novel extracellular functions beyond intracellular roles.

Purpose of the Study:

  • To review the current understanding of extracellular small heat shock proteins (sHsps).
  • To highlight the secretion mechanisms and therapeutic potential of sHsps (Hsp27, αBC, Hsp20).

Main Methods:

  • Literature review of studies on extracellular sHsps.
  • Analysis of proposed non-classical secretion pathways (lysoendosomal, exosomal).
  • Examination of therapeutic effects of exogenous sHsps in disease models.

Main Results:

  • Extracellular sHsps are involved in cell-cell communication, immune cell activation, and anti-inflammatory responses.
  • sHsps are secreted via non-classical pathways, notably through exosomes.
  • Exosomal sHsps demonstrate beneficial effects in preclinical disease models.

Conclusions:

  • Extracellular sHsps possess significant roles in intercellular signaling and immune modulation.
  • Exosomal secretion is a key mechanism for extracellular sHsp release.
  • Further research into sHsp secretion and therapeutic applications is warranted.