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HO1

Gene
HO1
Protein
Heme oxygenase 1, chloroplastic
Organism
Oryza sativa subsp. japonica
Length
289 amino acids
Function
Catalyzes the opening of the heme ring to form the open-chain tetrapyrrole biliverdin IX with the release of iron and carbon monoxide (CO). Is a key enzyme in the synthesis of the chromophore of the phytochrome family of plant photoreceptors. Essential for photoperiod response and repression of flowering through cytochromes that inhibit flowering by affecting both HD1 and EHD1 flowering pathways.
Similarity
Belongs to the heme oxygenase family.
Mass
31.918 kDa
Sequence
MAPAAASLTAPNALAATSLPFLHGRKSGGGGVSVHAGAPSPSRAVAVVARRLWGSASSSRRMVVAAATAAEMAPAASGEEGKPFVEEMRAVAMRLHTKDQAKEGEKEPQAPPVARWEPSVDGYLRFLVDSKLVFETLETIVDRAAVPWYAEFRNTGLERSEQLKKDLEWFKEQGHTIPEPSAPGTTYASYLEELAEKDSQAFICHFYNVYFAHTAGGRMIGKKVSENILNKKELEFYKWEGNLSQLLQNVRNKLNEVASSWTREEKDHCLDETEKSFSYSGDLLRHIFT

Gene
HO1
Protein
Heme oxygenase 1, chloroplastic
Organism
Arabidopsis thaliana
Length
282 amino acids
Function
Key enzyme in the synthesis of the chromophore of the phytochrome family of plant photoreceptors. Catalyzes the opening of the heme ring to form the open-chain tetrapyrrole biliverdin IX with the release of iron and carbon monoxide (CO). Produces specifically the biliverdin IX-alpha isomer. Can form complex with heme, is ferredoxin-dependent and its activity is increased in the presence of ascorbate. Plays a role in salt acclimation signaling. May affect the plastid-to-nucleus signaling pathway by perturbing tetrapyrrole synthesis. The plastid-to-nucleus signal plays an important role in the coordinated expression of both nuclear- and chloroplast-localized genes that encode photosynthesis-related proteins.
Similarity
Belongs to the heme oxygenase family.
Mass
32.691 kDa
Sequence
MAYLAPISSSLSIFKNPQLSRFQFSSSSPNPLFLRPRIQILSMTMNKSPSLVVVAATTAAEKQKKRYPGESKGFVEEMRFVAMRLHTKDQAKEGEKETKSIEERPVAKWEPTVEGYLRFLVDSKLVYDTLELIIQDSNFPTYAEFKNTGLERAEKLSTDLEWFKEQGYEIPEPTAPGKTYSQYLKELAEKDPQAFICHFYNIYFAHSAGGRMIGRKVAERILDNKELEFYKWDGELSQLLQNVREKLNKVAEEWTREEKNHCLEETEKSFKYSGEILRLILS