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Introduction of regioselective bacterial heme oxygenases into Arabidopsis hy1-1 supports the retrograde heme signaling hypothesis.

Plant physiology - 2 Jun 2026

Takenoya Mihoko, Shimizu Takayuki, Miyake Keita, Masuda Tatsuru

Abstract excerpt

Heme is synthesized in the plastid and metabolized to phytochromobilin (PΦB) in 2 enzymatic steps: heme oxygenase (HO) and PΦB synthase (HY2). In Arabidopsis thaliana (Arabidopsis), HO1/HY1/GUN2 predominantly functions for heme catabolism among the HO isoforms. Our previous study demonstrated that HO1 localization is altered in plastids or in the cytosol due to transcriptional start-site regulation. Introduction...

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Identifiers

PMID: 42176320
DOI: 10.1093/plphys/kiag304
PMCID: PMC13316938

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