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Polyhydroxybutyrate And Inorganic Polyphosphate Are Essential In Structure/function Relationship Of A Cold/pain/steroid Receptor TRPM8 | 58032
ISSN: 2155-6199
Journal of Bioremediation & Biodegradation
Open Access
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Protein post translational modifications, such as glycosylation, acetylation, or phosphorylation, are widespread phenomena
in cellular physiology. In our study, we focus on post translational modification (PTM) of a cold, pain, and newly
recognized testosterone receptor, TRPM8 by a polyester comprised of repeated units of R-3-hydroxybutyrate, which forms
a polymeric chain, poly-(R)-3-hydroxybutyrate (PHB). We term this modification PHBylation by analogy with the known
protein modifications. However, PHBylation stands out of other PTMs that it is a covalent and permanent attachment of a large
hydrophobic polymer that introduces significant conformational changes on the channel protein and therefore impacts its
function. Along with PHB, we discovered that TRPM8 is modified with inorganic polyphosphate (polyP), where both polymers
essentially contribute to the channel structure/function relationship. We found that PHB was critical for the temperature and
ligand-induced TRPM8 channel activity. Furthermore, PHB mediated ligand binding to the channel, while polyP contributed
to its voltage-sensitivity. These results indicate that TRPM8 functions in a form of supramolecular complexes with PHB and
polyP. The formation of such complexes offers a new concept for model of a mammalian ion channel. It proposes indispensable
roles of these PTMs, reflecting (a) temperature- or ligand-induced conformational changes that translate to channel gating; (b)
proper protein folding and localization to the plasma membrane; and (c) PHB-poly P-rendered structure of anion-conducting
core within the protein, which ensures ion selection and conduction along the uniform energy profile lining the internal cavity
between both polymers.