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The Role of Siroheme in Sulfite and Nitrite Reductases
2009Sulfite and nitrite reductases (SiRs/NiRs) use siroheme, an iron-containing isobacteriochlorin, alongside a [4Fe-4S] cluster to perform the six-electron reduction of sulfite to sulfide or nitrite to ammonia. X-ray crystallographic structures of the catalytic siroheme-containing subunit of Escherichia coli assimilatory SiR provide clues about the ...
M. Elizabeth Stroupe +1 more
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Spectroscopic Properties of Siroheme Extracted from Sulfite Reductases
Journal of Inorganic Biochemistry, 1987Siroheme has been extracted from sulfite reductases and its properties in aqueous solution have been investigated by optical absorption, electron paramagnetic resonance (EPR), and magnetic circular dichroism (MDC) spectroscopy. The absorption spectrum of siroheme exhibits a marked pH dependence, and two pK values, 4.2 and 9.0, were determined by pH ...
L, Kang +3 more
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[207] Sulfite reductase (Bakers' Yeast)
1971Publisher Summary This chapter discusses the methods of preparation of Sulfite Reductase (Bakers' Yeast). Sulfite reductase of bakers' yeast catalyzes four types of reaction: reduction of sulfite, nitrite, and hydroxylamine by NADPH (reaction 1); reduction of sulfite by reduced methyl viologen (MVH) (reaction 2); diaphorase-like reactions in which ...
Akio Yoshimoto, Nobuo Naiki, Ryo Sato
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The octahaem MccA is a haem c–copper sulfite reductase
Nature, 2015The six-electron reduction of sulfite to sulfide is the pivot point of the biogeochemical cycle of the element sulfur. The octahaem cytochrome c MccA (also known as SirA) catalyses this reaction for dissimilatory sulfite utilization by various bacteria.
Hermann, Bianca +4 more
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Studies on yeast sulfite reductase I. Purification and characterization
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 19681. NADPH-sulfite reductase, catalyzing the reduction of sulfite to sulfide by NADPH, was purified from baker's yeast to an almost homogeneous state. The purified enzyme showed a sedimentation coefficient of 14.8 S. A minimal molecular weight of 350 000 was estimated from its flavin content. 2.
A, Yoshimoto, R, Sato
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[33] Sulfite reductase and APS reductase from Archaeoglobus fulgidus
2001Publisher Summary Archaeoglobus fulgidus carries out sulfate reduction via the pathway originally proposed for bacterial species. All steps of sulfate reduction occur in the cytoplasm, implying that sulfate must be transported across the cytoplasmic membrane. Sulfate transport has not been studied in A.
Christiane Dahl, Hans G. Trüper
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A Sulfite Reductase from Aspergills nidulans
The Journal of Biochemistry, 1961A, YOSHIMOTO, T, NAKAMURA, R, SATO
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