Selective Secretion of KDEL-Bearing Proteins: Mechanisms and Functions

In multicellular organisms, cells must continuously exchange messages with the right meaning, intensity, and duration. Most of these messages are delivered through cognate interactions between membrane and secretory proteins. Their conformational maturation is assisted by a vast array of chaperones...

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Bibliographic Details
Published in:Frontiers in cell and developmental biology 2022-07, Vol.10, p.967875-967875
Main Authors: Palazzo, F. C., Sitia, R., Tempio, T.
Format: Article
Language:English
Subjects:
Cell and Developmental Biology
ERp44
KDEL receptors
PDI
protein folding
protein quality control
protein secretion
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Summary:In multicellular organisms, cells must continuously exchange messages with the right meaning, intensity, and duration. Most of these messages are delivered through cognate interactions between membrane and secretory proteins. Their conformational maturation is assisted by a vast array of chaperones and enzymes, ensuring the fidelity of intercellular communication. These folding assistants reside in the early secretory compartment (ESC), a functional unit that encompasses endoplasmic reticulum (ER), intermediate compartment and cis-Golgi. Most soluble ESC residents have C-terminal KDEL-like motifs that prevent their transport beyond the Golgi. However, some accumulate in the ER, while others in downstream stations, implying different recycling rates. Moreover, it is now clear that cells can actively secrete certain ESC residents but not others. This essay discusses the physiology of their differential intracellular distribution, and the mechanisms that may ensure selectivity of release.
ISSN:2296-634X
2296-634X
DOI:10.3389/fcell.2022.967875