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Their concentrations are exquisitely regulated, including via dedicated two-component systems (TCSs) that sense signals and regulate adaptive responses. HemKR is a TCS present in both saprophytic and pathogenic <jats:italic>Leptospira<\/jats:italic> species, involved in the control of heme metabolism. However, the molecular means by which HemKR is switched on\/off in a signal-dependent way, are still unknown. Moreover, a comprehensive list of HemKR-regulated genes, potentially overlapped with iron-responsive targets, is also missing. Using the saprophytic species <jats:italic>Leptospira biflexa<\/jats:italic> as a model, we now show that 5-aminolevulinic acid (ALA) triggers the shutdown of the HemKR pathway in live cells, and does so by stimulating the phosphatase activity of HemK towards phosphorylated HemR. Phospho~HemR dephosphorylation leads to differential expression of multiple genes, including of heme metabolism and transport systems. Besides the heme-biosynthetic genes <jats:italic>hemA<\/jats:italic> and the catabolic <jats:italic>hmuO<\/jats:italic>, which we had previously reported as phospho~HemR targets, we now extend the regulon identifying additional genes. Finally, we discover that HemR inactivation brings about an iron-deficit tolerant phenotype, synergistically with iron-responsive signaling systems. Future studies with pathogenic <jats:italic>Leptospira<\/jats:italic> will be able to confirm whether such tolerance to iron deprivation is conserved among <jats:italic>Leptospira<\/jats:italic> spp., in which case HemKR could play a vital role during infection where available iron is scarce. In sum, HemKR responds to abundance of porphyrin metabolites by shutting down and controlling heme homeostasis, while also contributing to integrate the regulation of heme and iron metabolism in the <jats:italic>L<\/jats:italic>. <jats:italic>biflexa<\/jats:italic> spirochete model.<\/jats:p>","DOI":"10.1371\/journal.pone.0311040","type":"journal-article","created":{"date-parts":[[2024,9,26]],"date-time":"2024-09-26T17:41:17Z","timestamp":1727372477000},"page":"e0311040","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Signal-sensing triggers the shutdown of HemKR, regulating heme and iron metabolism in the spirochete Leptospira biflexa"],"prefix":"10.1371","volume":"19","author":[{"given":"Juan 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