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Nitric Oxide Signaling Through Soluble Guanylate Cyclase (Paperback) Loot Price: R1,584 Discovery Miles 15 840
Nitric Oxide Signaling Through Soluble Guanylate Cyclase (Paperback): Xiaohui Hu
Nitric Oxide Signaling Through Soluble Guanylate Cyclase (Paperback): Xiaohui Hu

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Nitric Oxide Signaling Through Soluble Guanylate Cyclase (Paperback)

Xiaohui Hu

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Loot Price R1,584 Discovery Miles 15 840

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Soluble guanylyl/guanylate cyclase (sGC), the primary receptor for nitric oxide (NO), is a heme containing heterodimeric enzyme involved in numerous physiological events in animals. The small molecule YC-1 stimulates sGC, but the mechanism behind and the location of binding are unknown. I have developed a prokaryotic expression system for insect (Manduca sexta) sGC. The recombinant holoenzyme, like its mammalian counterpart, is responsive to NO, CO and YC-1, displaying a 175-fold increase in activity on binding. Truncated constructs containing the N-terminal two-thirds of both subunits (msGC-NT) were designed to facilitate expression. With the highly pure material, we investigated NO and CO binding, reaction kinetics and regulation. Binding of NO to msGC-NT heme forms a six-coordinate intermediate followed by release of the proximal histidine to yield a five-coordinate nitrosyl complex. The conversion rate is insensitive to nucleotides, YC-1 and changes in NO concentration up to ∼30 micromolar. In contrast, NO release from msGC-NT is biphasic in the absence of YC-1, while binding of YC-1 eliminates the fast phase but has little effect on the slower phase. CO binding to msGC-NT is also regulated by YC-1. The CO release rate is reduced by YC-1 while the on rate remains unchanged, which leads to an ∼50-fold increase in binding affinity. YC-1 binding leads to a substantial geminate recombination of CO to msGC-NT upon photolysis. Our data are consistent with a model for allosteric activation in which (1) YC-1 binds away from the catalytic site and; (2) sGC undergoes a conformational switch between two states of an open and a closed heme pocket. The final catalysis results from the integration of the influence of numerous allosteric effectors on the equilibrium between these two states. S -nitrosoglutathione (GSNO) exists in vivo and plays important roles in NO signaling. We have developed a model cell line, in which inducible NO synthase and human sGC genes were included. GSNO stimulation of sGC has been investigated using recombinant insect and human enzymes. GSNO can activate sGC as efficiently as gaseous NO, but apparently with a distinct mechanism. GSNO or endogenous NO could S -nitrosylate sGC, which might regulate the enzyme function.


Imprint: Proquest, Umi Dissertation Publishing
Country of origin: United States
Release date: September 2011
First published: September 2011
Authors: Xiaohui Hu
Dimensions: 254 x 203 x 11mm (L x W x T)
Format: Paperback - Trade
Pages: 168
ISBN-13: 978-1-243-56509-9
Barcode: 9781243565099
Categories: Books > Science & Mathematics > Biology, life sciences
Books > Science & Mathematics > Biology, life sciences > General
LSN: 1-243-56509-8

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