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X-ray crystal structure of the light-independent protochlorophyllide reductase
A unique trans-specific reduction mechanism is proposed in which the distorted C17-propionate of Pchlide and an aspartate from BchB serve as proton donors for C18 and C17 of PChlide, respectively. Expand
Mechanism of the Carotenoid-to-Bacteriochlorophyll Energy Transfer via the S1 State in the LH2 Complexes from Purple Bacteria
This investigation was motivated by a desire to get a deeper insight into the mechanism of carotenoiod-to-bacteriochlorophyll (Car-to-BChl) energy transfer proceeding via the carotenoid S1 state.Expand
A Second Nitrogenase-like Enzyme for Bacteriochlorophyll Biosynthesis
It is demonstrated that the B-ring of chlorin is reduced by a second nitrogenase-like enzyme and that the sequential actions of two nitrogen enzyme-like enzymes, DPOR and COR, convert porphyrin to bacteriochlorin. Expand
Identification of Two Homologous Genes, chlAI and chlAII, That Are Differentially Involved in Isocyclic Ring Formation of Chlorophyll a in the Cyanobacterium Synechocystis sp. PCC 6803*
Findings suggested that Chl AI is the sole MPE cyclase system under aerobic conditions and that the induced ChlAII operates together with ChlAI under micro-oxic conditions. Expand
An unexpectedly branched biosynthetic pathway for bacteriochlorophyll b capable of absorbing near-infrared light
The present data indicate that the plasticity of the nitrogenase-like enzyme caused the branched pathways of BChls a and b biosynthesis, ultimately leading to ecologically different niches of B Chl a- and b-based photosynthesis differentiated by more than 150 nm wavelength. Expand
Metabolic engineering of the Chl d-dominated cyanobacterium Acaryochloris marina: production of a novel Chl species by the introduction of the chlorophyllide a oxygenase gene.
A transformation system for a Chl d-dominated cyanobacterium, Acaryochloris marina, is established for the first time, demonstrating the flexibility of the Chl biosynthetic pathway for the production of novel Chl species, indicating that a new organism with a novel ChL might be discovered in the future. Expand
Ubiquity and quantitative significance of detoxification catabolism of chlorophyll associated with protistan herbivory
The herbivorous protists that convert chlorophyll a to cPPB-aE are suggested to play more significant roles in the modern oceanic carbon flux than was previously recognized, critically linking microscopic primary producers to the macroscopic food web and carbon sequestration in the ocean. Expand
Inactivation of human placenta glutathione S-transferase by SH/SS exchange reaction with biological disulfides.
Cystine and cystamine inactivated the activity by pseudo first-order in low concentrations, accompanying the stoichiometric incorporation of the radioactivity of [14C]-cystine to the enzyme protein until a half mole per one subunit. Expand
A null lesion in the rhodopin 3,4-desaturase of Rhodospirillum rubrum unmasks a cryptic branch of the carotenoid biosynthetic pathway.
It is proposed that the observed nonnatural carotenoids can be explained by the inclusion of a cryptic branch, unmasked by the absence of rhodopin 3,4-desaturase, in the established linear pathway for spirilloxanthin biosynthesis. Expand
Completion of biosynthetic pathways for bacteriochlorophyll g in Heliobacterium modesticaldum: The C8-ethylidene group formation.
The finding led to plausible biosynthetic pathways for 8(1)-hydroxy-chlorophyll a, a primary electron acceptor from the special pair in heliobacterial reaction centers, and proposed catalytic mechanisms on hydrogenation reaction of the ethylidene synthase-type CORs are discussed. Expand