- EMDB-18662: Cryo-EM structure of coproheme decarboxylase from Corynebacterium... -
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データベース: EMDB / ID: EMD-18662
タイトル
Cryo-EM structure of coproheme decarboxylase from Corynebacterium diphtheriae in complex with heme b
マップデータ
試料
複合体: Coproheme decarboxylase from Corynebacterium diphteriae in complex with heme b
タンパク質・ペプチド: Coproheme decarboxylase
リガンド: PROTOPORPHYRIN IX CONTAINING FE
リガンド: water
キーワード
Heme Binding protein / Heme Biosynthesis / Actinobacteria / OXIDOREDUCTASE
機能・相同性
oxidoreductase activity, acting on the CH-CH group of donors, oxygen as acceptor / hydrogen peroxide-dependent heme synthase / Heme-dependent peroxidase ChdC/CLD / Chlorite dismutase / heme B biosynthetic process / Dimeric alpha-beta barrel / heme binding / metal ion binding / Coproheme decarboxylase
ジャーナル: Protein Sci / 年: 2025 タイトル: Insights into the flexibility of the domain-linking loop in actinobacterial coproheme decarboxylase through structures and molecular dynamics simulations. 著者: Gaurav Patil / Diego Javier Alonso de Armiño / Yirui Guo / Paul G Furtmüller / Dominika Borek / Dario A Estrin / Stefan Hofbauer / 要旨: Prokaryotic heme biosynthesis in Gram-positive bacteria follows the coproporphyrin-dependent heme biosynthesis pathway. The last step in this pathway is catalyzed by the enzyme coproheme ...Prokaryotic heme biosynthesis in Gram-positive bacteria follows the coproporphyrin-dependent heme biosynthesis pathway. The last step in this pathway is catalyzed by the enzyme coproheme decarboxylase, which oxidatively transforms two propionate groups into vinyl groups yielding heme b. The catalytic reaction cycle of coproheme decarboxylases exhibits four different states: the apo-form, the substrate (coproheme)-bound form, a transient three-propionate intermediate form (monovinyl, monopropionate deuteroheme; MMD), and the product (heme b)-bound form. In this study, we used cryogenic electron microscopy single-particle reconstruction (cryo-EM SPR) to characterize structurally the apo and heme b-bound forms of actinobacterial coproheme decarboxylase from Corynebacterium diphtheriae. The flexible loop that connects the N-terminal and the C-terminal ferredoxin domains of coproheme decarboxylases plays an important role in interactions between the enzyme and porphyrin molecule. To understand the role of this flexible loop, we performed molecular dynamics simulations on the apo and heme b coproheme decarboxylase from Corynebacterium diphtheriae. Our results are discussed in the context of the published structural information on coproheme-bound and MMD-bound coproheme decarboxylase and with respect to the reaction mechanism. Having structural information of all four enzymatically relevant states helps in understanding structural restraints with a functional impact.