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A novel insight into the heme and NO/CO binding mechanism of the alpha subunit of human soluble guanylate cyclase

Content Provider	Springer Nature Link
Author	Zhong, Fangfang Pan, Jie Liu, Xiaoxiao Wang, Hongyan Ying, Tianlei Su, Jihu Huang, Zhong Xian Tan, Xiangshi
Copyright Year	2011
Abstract	Human soluble guanylate cyclase (sGC), a critical heme-containing enzyme in the NO-signaling pathway of eukaryotes, is an αβ heterodimeric hemoprotein. Upon the binding of NO to the heme, sGC catalyzes the conversion of GTP to cyclic GMP, playing a crucial role in many physiological processes. However, the specific contribution of the α and β subunits of sGC in the intact heme binding remained intangible. The recombinant human sGC α1 subunit has been expressed in Escherichia coli and characterized for the first time. The heme binding and related NO/CO binding properties of both the α1 subunit and the β1 subunit were investigated via heme reconstitution, UV–vis spectroscopy, EPR spectroscopy, stopped-flow kinetics, and homology modeling. These results indicated that the α1 subunit of human sGC, lacking the conserved axial ligand, is likely to interact with heme noncovalently. On the basis of the equilibrium and kinetics of CO binding to sGC, one possible CO binding model was proposed. CO binds to human sGCβ195 by simple one-step binding, whereas CO binds to human sGCα259, possibly from both axial positions through a more complex process. The kinetics of NO dissociation from human sGC indicated that the NO dissociation from sGC was complex, with at least two release phases, and human sGCα259 has a smaller k 1 but a larger k 2. Additionally, the role of the cavity of the α1 subunit of human sGC was explored, and the results indicate that the cavity likely accommodates heme. These results are beneficial for understanding the overall structure of the heme binding site of the human sGC and the NO/CO signaling mechanism.
Starting Page	1227
Ending Page	1239
Page Count	13
File Format	PDF
ISSN	09498257
Journal	JBIC Journal of Biological Inorganic Chemistry
Volume Number	16
Issue Number	8
e-ISSN	14321327
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-07-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Human soluble guanylate cyclase NO/CO binding Heme binding NO/CO signaling YC-1 Biochemistry Microbiology
Content Type	Text
Resource Type	Article
Subject	Biochemistry Inorganic Chemistry

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