Fungi - Candida albicans - Research News, Data, Publications & Aproaches - ERG11 Mutations - Telomeres - Sub-Telomeric Structures - Chromatin Landscape - Nuclear Biology & Nuclear Chemistry Aproaches - The Chemical Ecology of the Nuclear Space: Redox Dynamics, Heme Chemistry, and the Molecular Governance of ERG11 - Non-Elaborate Posts - Post 3

 

 Heme, the iron–protoporphyrin IX complex, lies at the chemical and regulatory heart of ERG11’s function. As a prosthetic group, it enables the monooxygenation reaction that demethylates lanosterol. But within the nucleus, heme also serves as a diffusible signaling molecule, linking metabolic state to gene regulation. The nuclear heme pool fluctuates with oxygen availability and mitochondrial biosynthesis, transmitting the metabolic condition to heme-responsive transcriptional circuits. When azole drugs inhibit ERG11, intracellular lanosterol accumulation perturbs heme homeostasis, leading to transient nuclear heme sequestration and redox stress. This feedback amplifies transcriptional activation of ERG11 itself — an autoregulatory chemical loop that integrates enzyme inhibition, cofactor availability, and redox balance within a single nuclear circuit