An adaptor for feedback regulation of heme biosynthesis by a mitochondrial protease · T. Cottle et al.
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Thomas Cottle1†, Lydia Joh1†, Cori Posner1†, Adam DeCosta1, Dean R. Campagna2, Mark D. Fleming2,3, Sarah Ducamp2,3, Julia R. Kardon1* Heme biosynthesis is tightly coordinated to support essential functions without accumulating toxic porphyrins and depleting cellular iron. Heme induces degradation of the heme biosynthetic enzyme, 5-aminolevulinate synthase (ALAS), by the mitochondrial caseinolytic protease complex CLPX-CLPP (CLPXP), but the mechanism for heme-triggered degradation had not been elucidated. We found that polymerase delta-interacting protein 2 (POLDIP2) is a heme-sensing adaptor protein sufficient to reconstitute negative feedback degradation of ALAS by CLPXP. POLDIP2 was necessary to support ALAS turnover in cells and regulate heme production during erythropoiesis. POLDIP2 directly recognized and recruited heme-bound ALAS to CLPXP. …
摘自《科学》(Science)第393卷 第6810期 · 2026年7月30日,T. Cottle et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。