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Acta Crystallographica Section F: Structural Biology and Crystallization Communications (1)
Invertebrate Neuroscience (1)
Ashikawa, Yuji (2)
Akamatsu, Miki (1)
Fujimoto, Zui (1)
Hirata, Koichi (1)
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Umeda, Takashi (1)
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Crystallization and preliminary X-ray diffraction studies of a novel ferredoxin involved in the dioxygenation of carbazole by Novosphingobium sp. KA1
Acta Crystallographica Section F: Structural Biology and Crystallization Communications
The ferredoxin component of carbazole 1,9a-dioxygenase (CARDO-F) is involved in an electron-transfer reaction. The CARDO-F from Novosphingobium sp. KA1 was crystallized under anaerobic conditions and diffracted to a resolution of 1.9 Å.
Novosphingobium sp. KA1 uses carbazole 1,9a-dioxygenase (CARDO) as the first dioxygenase in its carbazole-degradation pathway. The CARDO of KA1 contains a terminal oxygenase component and two electron-transfer components: ferredoxin and ferredoxin reductase. In contrast to the CARDO systems of other species, the ferredoxin component of KA1 is a putidaredoxin-type protein. This novel ferredoxin was crystallized at 293 K by the hanging-drop vapour-diffusion method using PEG MME 550 as the precipitant under anaerobic conditions. The crystals belong to space group C2221 and diffraction data were collected to a resolution of 1.9 Å (the diffraction limit was 1.6 Å).
carbazole; putidaredoxin-type proteins; Rieske nonhaem iron oxygenases
Crystal structures of Lymnaea stagnalis AChBP in complex with neonicotinoid insecticides imidacloprid and clothianidin
Sattelle, David B.
Neonicotinoid insecticides, which act on nicotinic acetylcholine receptors (nAChRs) in a variety of ways, have extremely low mammalian toxicity, yet the molecular basis of such actions is poorly understood. To elucidate the molecular basis for nAChR–neonicotinoid interactions, a surrogate protein, acetylcholine binding protein from Lymnaea stagnalis (Ls-AChBP) was crystallized in complex with neonicotinoid insecticides imidacloprid (IMI) or clothianidin (CTD). The crystal structures suggested that the guanidine moiety of IMI and CTD stacks with Tyr185, while the nitro group of IMI but not of CTD makes a hydrogen bond with Gln55. IMI showed higher binding affinity for Ls-AChBP than that of CTD, consistent with weaker CH–π interactions in the Ls-AChBP–CTD complex than in the Ls-AChBP–IMI complex and the lack of the nitro group-Gln55 hydrogen bond in CTD. Yet, the NH at position 1 of CTD makes a hydrogen bond with the backbone carbonyl of Trp143, offering an explanation for the diverse actions of neonicotinoids on nAChRs.
Acetylcholine binding protein (Lymnaea stagnalis); Crystal structures; Neonicotinoids; Nicotinic acetylcholine receptors; Ion channels
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