1
|
Yen YC, Li Y, Chen CL, Klose T, Watts VJ, Dessauer CW, Tesmer JJG. Structure of adenylyl cyclase 5 in complex with Gβγ offers insights into ADCY5-related dyskinesia. Nat Struct Mol Biol 2024; 31:1189-1197. [PMID: 38589608 PMCID: PMC11329361 DOI: 10.1038/s41594-024-01263-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 03/04/2024] [Indexed: 04/10/2024]
Abstract
The nine different membrane-anchored adenylyl cyclase isoforms (AC1-9) in mammals are stimulated by the heterotrimeric G protein, Gαs, but their response to Gβγ regulation is isoform specific. In the present study, we report cryo-electron microscope structures of ligand-free AC5 in complex with Gβγ and a dimeric form of AC5 that could be involved in its regulation. Gβγ binds to a coiled-coil domain that links the AC transmembrane region to its catalytic core as well as to a region (C1b) that is known to be a hub for isoform-specific regulation. We confirmed the Gβγ interaction with both purified proteins and cell-based assays. Gain-of-function mutations in AC5 associated with human familial dyskinesia are located at the interface of AC5 with Gβγ and show reduced conditional activation by Gβγ, emphasizing the importance of the observed interaction for motor function in humans. We propose a molecular mechanism wherein Gβγ either prevents dimerization of AC5 or allosterically modulates the coiled-coil domain, and hence the catalytic core. As our mechanistic understanding of how individual AC isoforms are uniquely regulated is limited, studies such as this may provide new avenues for isoform-specific drug development.
Collapse
Affiliation(s)
- Yu-Chen Yen
- Department of Biological Sciences, Purdue University, West Lafayette, IN, USA
| | - Yong Li
- Department of Integrative Biology and Pharmacology, McGovern Medical School, University of Texas Health Science Center, Houston, TX, USA
| | - Chun-Liang Chen
- Department of Biological Sciences, Purdue University, West Lafayette, IN, USA
| | - Thomas Klose
- Purdue Cryo-EM Facility, Hockmeyer Hall for Structural Biology, Purdue University, West Lafayette, IN, USA
| | - Val J Watts
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, USA
| | - Carmen W Dessauer
- Department of Integrative Biology and Pharmacology, McGovern Medical School, University of Texas Health Science Center, Houston, TX, USA
| | - John J G Tesmer
- Department of Biological Sciences, Purdue University, West Lafayette, IN, USA.
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, USA.
| |
Collapse
|
2
|
Yen YC, Li Y, Chen CL, Klose T, Watts VJ, Dessauer CW, Tesmer JJG. Isoform Specific Regulation of Adenylyl Cyclase 5 by Gβγ. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.02.539090. [PMID: 37205557 PMCID: PMC10187219 DOI: 10.1101/2023.05.02.539090] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The nine different membrane-anchored adenylyl cyclase isoforms (AC1-9) in mammals are stimulated by the heterotrimeric G protein Gαs, but their response to Gβγ regulation is isoform-specific. For example, AC5 is conditionally activated by Gβγ. Here, we report cryo-EM structures of ligand-free AC5 in complex with Gβγ and of a dimeric form of AC5 that could be involved in its regulation. Gβγ binds to a coiled-coil domain that links the AC transmembrane region to its catalytic core as well as to a region (C1b) that is known to be a hub for isoform-specific regulation. We confirmed the Gβγ interaction with both purified proteins and cell-based assays. The interface with Gβγ involves AC5 residues that are subject to gain-of-function mutations in humans with familial dyskinesia, indicating that the observed interaction is important for motor function. A molecular mechanism wherein Gβγ either prevents dimerization of AC5 or allosterically modulates the coiled-coil domain, and hence the catalytic core, is proposed. Because our mechanistic understanding of how individual AC isoforms are uniquely regulated is limited, studies such as this may provide new avenues for isoform-specific drug development.
Collapse
Affiliation(s)
- Yu-Chen Yen
- Department of Biological Sciences, Purdue University, West Lafayette, IN, USA
| | - Yong Li
- Department Integrative Biology and Pharmacology, McGovern Medical School, University of Texas Health Science Center, Houston, TX, USA
| | - Chun-Liang Chen
- Department of Biological Sciences, Purdue University, West Lafayette, IN, USA
| | - Thomas Klose
- Purdue CryoEM Facility, Suite 171, Hockmeyer Hall for Structural Biology, Purdue University, West Lafayette, IN, USA
| | - Val J Watts
- Department of Molecular Pharmacology and Medicinal Chemistry, Purdue University, West Lafayette, IN, USA
| | - Carmen W Dessauer
- Department Integrative Biology and Pharmacology, McGovern Medical School, University of Texas Health Science Center, Houston, TX, USA
| | - John J. G. Tesmer
- Department of Biological Sciences, Purdue University, West Lafayette, IN, USA
- Department of Molecular Pharmacology and Medicinal Chemistry, Purdue University, West Lafayette, IN, USA
| |
Collapse
|
3
|
Jehle A, Garaschuk O. The Interplay between cGMP and Calcium Signaling in Alzheimer's Disease. Int J Mol Sci 2022; 23:7048. [PMID: 35806059 PMCID: PMC9266933 DOI: 10.3390/ijms23137048] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/31/2022] [Accepted: 06/22/2022] [Indexed: 02/04/2023] Open
Abstract
Cyclic guanosine monophosphate (cGMP) is a ubiquitous second messenger and a key molecule in many important signaling cascades in the body and brain, including phototransduction, olfaction, vasodilation, and functional hyperemia. Additionally, cGMP is involved in long-term potentiation (LTP), a cellular correlate of learning and memory, and recent studies have identified the cGMP-increasing drug Sildenafil as a potential risk modifier in Alzheimer's disease (AD). AD development is accompanied by a net increase in the expression of nitric oxide (NO) synthases but a decreased activity of soluble guanylate cyclases, so the exact sign and extent of AD-mediated imbalance remain unclear. Moreover, human patients and mouse models of the disease present with entangled deregulation of both cGMP and Ca2+ signaling, e.g., causing changes in cGMP-mediated Ca2+ release from the intracellular stores as well as Ca2+-mediated cGMP production. Still, the mechanisms governing such interplay are poorly understood. Here, we review the recent data on mechanisms underlying the brain cGMP signaling and its interconnection with Ca2+ signaling. We also discuss the recent evidence stressing the importance of such interplay for normal brain function as well as in Alzheimer's disease.
Collapse
Affiliation(s)
| | - Olga Garaschuk
- Department of Neurophysiology, Institute of Physiology, Eberhard Karls University of Tübingen, 72074 Tübingen, Germany;
| |
Collapse
|
4
|
Li J, Zhou Y, Lin YW, Tan X. A novel insight into the molecular mechanism of human soluble guanylyl cyclase focused on catalytic domain in living cells. Biochem Biophys Res Commun 2022; 604:51-56. [DOI: 10.1016/j.bbrc.2022.03.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 03/04/2022] [Indexed: 11/25/2022]
|
5
|
Lehnert N, Kim E, Dong HT, Harland JB, Hunt AP, Manickas EC, Oakley KM, Pham J, Reed GC, Alfaro VS. The Biologically Relevant Coordination Chemistry of Iron and Nitric Oxide: Electronic Structure and Reactivity. Chem Rev 2021; 121:14682-14905. [PMID: 34902255 DOI: 10.1021/acs.chemrev.1c00253] [Citation(s) in RCA: 96] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Nitric oxide (NO) is an important signaling molecule that is involved in a wide range of physiological and pathological events in biology. Metal coordination chemistry, especially with iron, is at the heart of many biological transformations involving NO. A series of heme proteins, nitric oxide synthases (NOS), soluble guanylate cyclase (sGC), and nitrophorins, are responsible for the biosynthesis, sensing, and transport of NO. Alternatively, NO can be generated from nitrite by heme- and copper-containing nitrite reductases (NIRs). The NO-bearing small molecules such as nitrosothiols and dinitrosyl iron complexes (DNICs) can serve as an alternative vehicle for NO storage and transport. Once NO is formed, the rich reaction chemistry of NO leads to a wide variety of biological activities including reduction of NO by heme or non-heme iron-containing NO reductases and protein post-translational modifications by DNICs. Much of our understanding of the reactivity of metal sites in biology with NO and the mechanisms of these transformations has come from the elucidation of the geometric and electronic structures and chemical reactivity of synthetic model systems, in synergy with biochemical and biophysical studies on the relevant proteins themselves. This review focuses on recent advancements from studies on proteins and model complexes that not only have improved our understanding of the biological roles of NO but also have provided foundations for biomedical research and for bio-inspired catalyst design in energy science.
Collapse
Affiliation(s)
- Nicolai Lehnert
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Eunsuk Kim
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Hai T Dong
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Jill B Harland
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Andrew P Hunt
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Elizabeth C Manickas
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Kady M Oakley
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - John Pham
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Garrett C Reed
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Victor Sosa Alfaro
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| |
Collapse
|
6
|
Dent MR, DeMartino AW, Tejero J, Gladwin MT. Endogenous Hemoprotein-Dependent Signaling Pathways of Nitric Oxide and Nitrite. Inorg Chem 2021; 60:15918-15940. [PMID: 34313417 PMCID: PMC9167621 DOI: 10.1021/acs.inorgchem.1c01048] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Interdisciplinary research at the interface of chemistry, physiology, and biomedicine have uncovered pivotal roles of nitric oxide (NO) as a signaling molecule that regulates vascular tone, platelet aggregation, and other pathways relevant to human health and disease. Heme is central to physiological NO signaling, serving as the active site for canonical NO biosynthesis in nitric oxide synthase (NOS) enzymes and as the highly selective NO binding site in the soluble guanylyl cyclase receptor. Outside of the primary NOS-dependent biosynthetic pathway, other hemoproteins, including hemoglobin and myoglobin, generate NO via the reduction of nitrite. This auxiliary hemoprotein reaction unlocks a "second axis" of NO signaling in which nitrite serves as a stable NO reservoir. In this Forum Article, we highlight these NO-dependent physiological pathways and examine complex chemical and biochemical reactions that govern NO and nitrite signaling in vivo. We focus on hemoprotein-dependent reaction pathways that generate and consume NO in the presence of nitrite and consider intermediate nitrogen oxides, including NO2, N2O3, and S-nitrosothiols, that may facilitate nitrite-based signaling in blood vessels and tissues. We also discuss emergent therapeutic strategies that leverage our understanding of these key reaction pathways to target NO signaling and treat a wide range of diseases.
Collapse
Affiliation(s)
- Matthew R Dent
- Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Anthony W DeMartino
- Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Jesús Tejero
- Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Mark T Gladwin
- Heart, Lung, Blood, and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
7
|
Fischer P, Mukherjee S, Schiewer E, Broser M, Bartl F, Hegemann P. The inner mechanics of rhodopsin guanylyl cyclase during cGMP-formation revealed by real-time FTIR spectroscopy. eLife 2021; 10:e71384. [PMID: 34665128 PMCID: PMC8575461 DOI: 10.7554/elife.71384] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 10/18/2021] [Indexed: 01/01/2023] Open
Abstract
Enzymerhodopsins represent a recently discovered class of rhodopsins which includes histidine kinase rhodopsin, rhodopsin phosphodiesterases, and rhodopsin guanylyl cyclases (RGCs). The regulatory influence of the rhodopsin domain on the enzyme activity is only partially understood and holds the key for a deeper understanding of intra-molecular signaling pathways. Here, we present a UV-Vis and FTIR study about the light-induced dynamics of a RGC from the fungus Catenaria anguillulae, which provides insights into the catalytic process. After the spectroscopic characterization of the late rhodopsin photoproducts, we analyzed truncated variants and revealed the involvement of the cytosolic N-terminus in the structural rearrangements upon photo-activation of the protein. We tracked the catalytic reaction of RGC and the free GC domain independently by UV-light induced release of GTP from the photolabile NPE-GTP substrate. Our results show substrate binding to the dark-adapted RGC and GC alike and reveal differences between the constructs attributable to the regulatory influence of the rhodopsin on the conformation of the binding pocket. By monitoring the phosphate rearrangement during cGMP and pyrophosphate formation in light-activated RGC, we were able to confirm the M state as the active state of the protein. The described setup and experimental design enable real-time monitoring of substrate turnover in light-activated enzymes on a molecular scale, thus opening the pathway to a deeper understanding of enzyme activity and protein-protein interactions.
Collapse
Affiliation(s)
- Paul Fischer
- Institute for Biology, Experimental Biophysics, Humboldt-Universität zu BerlinBerlinGermany
| | - Shatanik Mukherjee
- Institute of Biology, Biophysical Chemistry, Humboldt University of BerlinBerlinGermany
| | - Enrico Schiewer
- Institute for Biology, Experimental Biophysics, Humboldt-Universität zu BerlinBerlinGermany
| | - Matthias Broser
- Institute for Biology, Experimental Biophysics, Humboldt-Universität zu BerlinBerlinGermany
| | - Franz Bartl
- Institute of Biology, Biophysical Chemistry, Humboldt University of BerlinBerlinGermany
| | - Peter Hegemann
- Institute for Biology, Experimental Biophysics, Humboldt-Universität zu BerlinBerlinGermany
| |
Collapse
|
8
|
Aramide Modupe Dosunmu-Ogunbi A, Galley JC, Yuan S, Schmidt HM, Wood KC, Straub AC. Redox Switches Controlling Nitric Oxide Signaling in the Resistance Vasculature and Implications for Blood Pressure Regulation: Mid-Career Award for Research Excellence 2020. Hypertension 2021; 78:912-926. [PMID: 34420371 DOI: 10.1161/hypertensionaha.121.16493] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The arterial resistance vasculature modulates blood pressure and flow to match oxygen delivery to tissue metabolic demand. As such, resistance arteries and arterioles have evolved a series of highly orchestrated cell-cell communication mechanisms between endothelial cells and vascular smooth muscle cells to regulate vascular tone. In response to neurohormonal agonists, release of several intracellular molecules, including nitric oxide, evokes changes in vascular tone. We and others have uncovered novel redox switches in the walls of resistance arteries that govern nitric oxide compartmentalization and diffusion. In this review, we discuss our current understanding of redox switches controlling nitric oxide signaling in endothelial and vascular smooth muscle cells, focusing on new mechanistic insights, physiological and pathophysiological implications, and advances in therapeutic strategies for hypertension and other diseases.
Collapse
Affiliation(s)
- Atinuke Aramide Modupe Dosunmu-Ogunbi
- Heart, Lung, Blood and Vascular Medicine Institute (A.A.M.D.-O., J.C.G., S.Y., H.M.S., K.C.W., A.C.S.), University of Pittsburgh, PA.,Department of Pharmacology and Chemical Biology (A.A.M.D.-O., J.C.G., H.M.S., A.C.S), University of Pittsburgh, PA
| | - Joseph C Galley
- Heart, Lung, Blood and Vascular Medicine Institute (A.A.M.D.-O., J.C.G., S.Y., H.M.S., K.C.W., A.C.S.), University of Pittsburgh, PA.,Department of Pharmacology and Chemical Biology (A.A.M.D.-O., J.C.G., H.M.S., A.C.S), University of Pittsburgh, PA
| | - Shuai Yuan
- Heart, Lung, Blood and Vascular Medicine Institute (A.A.M.D.-O., J.C.G., S.Y., H.M.S., K.C.W., A.C.S.), University of Pittsburgh, PA
| | - Heidi M Schmidt
- Heart, Lung, Blood and Vascular Medicine Institute (A.A.M.D.-O., J.C.G., S.Y., H.M.S., K.C.W., A.C.S.), University of Pittsburgh, PA.,Department of Pharmacology and Chemical Biology (A.A.M.D.-O., J.C.G., H.M.S., A.C.S), University of Pittsburgh, PA
| | - Katherine C Wood
- Heart, Lung, Blood and Vascular Medicine Institute (A.A.M.D.-O., J.C.G., S.Y., H.M.S., K.C.W., A.C.S.), University of Pittsburgh, PA
| | - Adam C Straub
- Heart, Lung, Blood and Vascular Medicine Institute (A.A.M.D.-O., J.C.G., S.Y., H.M.S., K.C.W., A.C.S.), University of Pittsburgh, PA.,Department of Pharmacology and Chemical Biology (A.A.M.D.-O., J.C.G., H.M.S., A.C.S), University of Pittsburgh, PA.,Center for Microvascular Research (A.C.S.), University of Pittsburgh, PA
| |
Collapse
|
9
|
Wittenborn EC, Marletta MA. Structural Perspectives on the Mechanism of Soluble Guanylate Cyclase Activation. Int J Mol Sci 2021; 22:ijms22115439. [PMID: 34064029 PMCID: PMC8196705 DOI: 10.3390/ijms22115439] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/17/2021] [Accepted: 05/18/2021] [Indexed: 11/30/2022] Open
Abstract
The enzyme soluble guanylate cyclase (sGC) is the prototypical nitric oxide (NO) receptor in humans and other higher eukaryotes and is responsible for transducing the initial NO signal to the secondary messenger cyclic guanosine monophosphate (cGMP). Generation of cGMP in turn leads to diverse physiological effects in the cardiopulmonary, vascular, and neurological systems. Given these important downstream effects, sGC has been biochemically characterized in great detail in the four decades since its discovery. Structures of full-length sGC, however, have proven elusive until very recently. In 2019, advances in single particle cryo–electron microscopy (cryo-EM) enabled visualization of full-length sGC for the first time. This review will summarize insights revealed by the structures of sGC in the unactivated and activated states and discuss their implications in the mechanism of sGC activation.
Collapse
|
10
|
Tyrosine 135 of the β1 subunit as binding site of BAY-543: Importance of the Y-x-S-x-R motif for binding and activation by sGC activator drugs. Eur J Pharmacol 2020; 881:173203. [DOI: 10.1016/j.ejphar.2020.173203] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 05/11/2020] [Accepted: 05/13/2020] [Indexed: 11/22/2022]
|
11
|
Khalid RR, Maryam A, Sezerman OU, Mylonas E, Siddiqi AR, Kokkinidis M. Probing the Structural Dynamics of the Catalytic Domain of Human Soluble Guanylate Cyclase. Sci Rep 2020; 10:9488. [PMID: 32528025 PMCID: PMC7289801 DOI: 10.1038/s41598-020-66310-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 05/04/2020] [Indexed: 01/25/2023] Open
Abstract
In the nitric oxide (NO) signaling pathway, human soluble guanylate cyclase (hsGC) synthesizes cyclic guanosine monophosphate (cGMP); responsible for the regulation of cGMP-specific protein kinases (PKGs) and phosphodiesterases (PDEs). The crystal structure of the inactive hsGC cyclase dimer is known, but there is still a lack of information regarding the substrate-specific internal motions that are essential for the catalytic mechanism of the hsGC. In the current study, the hsGC cyclase heterodimer complexed with guanosine triphosphate (GTP) and cGMP was subjected to molecular dynamics simulations, to investigate the conformational dynamics that have functional implications on the catalytic activity of hsGC. Results revealed that in the GTP-bound complex of the hsGC heterodimer, helix 1 of subunit α (α:h1) moves slightly inwards and comes close to helix 4 of subunit β (β:h4). This conformational change brings loop 2 of subunit β (β:L2) closer to helix 2 of subunit α (α:h2). Likewise, loop 2 of subunit α (α:L2) comes closer to helix 2 of subunit β (β:h2). These structural events stabilize and lock GTP within the closed pocket for cyclization. In the cGMP-bound complex, α:L2 detaches from β:h2 and establishes interactions with β:L2, which results in the loss of global structure compactness. Furthermore, with the release of pyrophosphate, the interaction between α:h1 and β:L2 weakens, abolishing the tight packing of the binding pocket. This study discusses the conformational changes induced by the binding of GTP and cGMP to the hsGC catalytic domain, valuable in designing new therapeutic strategies for the treatment of cardiovascular diseases.
Collapse
Affiliation(s)
- Rana Rehan Khalid
- Department of Biosciences, COMSATS University, Islamabad, 45550, Pakistan.,Department of Biology, University of Crete, 70013, Heraklion, Greece.,Department of Biostatistics and Medical Informatics, Acibadem M. A. A. University, Istanbul, 34752, Turkey
| | - Arooma Maryam
- Department of Biosciences, COMSATS University, Islamabad, 45550, Pakistan.,Department of Pharmaceutical Chemistry, Biruni Universitesi, Istanbul, 34010, Turkey
| | - Osman Ugur Sezerman
- Department of Biostatistics and Medical Informatics, Acibadem M. A. A. University, Istanbul, 34752, Turkey
| | - Efstratios Mylonas
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas (IMBB-FORTH), 70013, Heraklion, Greece
| | - Abdul Rauf Siddiqi
- Department of Biosciences, COMSATS University, Islamabad, 45550, Pakistan.
| | - Michael Kokkinidis
- Department of Biology, University of Crete, 70013, Heraklion, Greece. .,Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas (IMBB-FORTH), 70013, Heraklion, Greece.
| |
Collapse
|
12
|
cGMP signalling in cardiomyocyte microdomains. Biochem Soc Trans 2020; 47:1327-1339. [PMID: 31652306 DOI: 10.1042/bst20190225] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 09/20/2019] [Accepted: 09/24/2019] [Indexed: 02/07/2023]
Abstract
3',5'-Cyclic guanosine monophosphate (cGMP) is one of the major second messengers critically involved in the regulation of cardiac electrophysiology, hypertrophy, and contractility. Recent molecular and cellular studies have significantly advanced our understanding of the cGMP signalling cascade, its local microdomain-specific regulation and its role in protecting the heart from pathological stress. Here, we summarise recent findings on cardiac cGMP microdomain regulation and discuss their potential clinical significance.
Collapse
|
13
|
Childers KC, Yao XQ, Giannakoulias S, Amason J, Hamelberg D, Garcin ED. Synergistic mutations in soluble guanylyl cyclase (sGC) reveal a key role for interfacial regions in the sGC activation mechanism. J Biol Chem 2019; 294:18451-18464. [PMID: 31645439 PMCID: PMC6885636 DOI: 10.1074/jbc.ra119.011010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/17/2019] [Indexed: 01/20/2023] Open
Abstract
Soluble guanylyl cyclase (sGC) is the main receptor for nitric oxide (NO) and a central component of the NO-cGMP pathway, critical to cardiovascular function. NO binding to the N-terminal sensor domain in sGC enhances the cyclase activity of the C-terminal catalytic domain. Our understanding of the structural elements regulating this signaling cascade is limited, hindering structure-based drug design efforts that target sGC to improve the management of cardiovascular diseases. Conformational changes are thought to propagate the NO-binding signal throughout the entire sGC heterodimer, via its coiled-coil domain, to reorient the catalytic domain into an active conformation. To identify the structural elements involved in this signal transduction cascade, here we optimized a cGMP-based luciferase assay that reports on heterologous sGC activity in Escherichia coli and identified several mutations that activate sGC. These mutations resided in the dorsal flaps, dimer interface, and GTP-binding regions of the catalytic domain. Combinations of mutations from these different elements synergized, resulting in even greater activity and indicating a complex cross-talk among these regions. Molecular dynamics simulations further revealed conformational changes underlying the functional impact of these mutations. We propose that the interfacial residues play a central role in the sGC activation mechanism by coupling the coiled-coil domain to the active site via a series of hot spots. Our results provide new mechanistic insights not only into the molecular pathway for sGC activation but also for other members of the larger nucleotidyl cyclase family.
Collapse
Affiliation(s)
- Kenneth C Childers
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, Maryland 21250
| | - Xin-Qiu Yao
- Department of Chemistry, Georgia State University, Atlanta, Georgia 30302-3965
| | - Sam Giannakoulias
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, Maryland 21250
| | - Joshua Amason
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, Maryland 21250.
| | - Donald Hamelberg
- Department of Chemistry, Georgia State University, Atlanta, Georgia 30302-3965
| | - Elsa D Garcin
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, Maryland 21250.
| |
Collapse
|
14
|
Horst BG, Yokom AL, Rosenberg DJ, Morris KL, Hammel M, Hurley JH, Marletta MA. Allosteric activation of the nitric oxide receptor soluble guanylate cyclase mapped by cryo-electron microscopy. eLife 2019; 8:e50634. [PMID: 31566566 PMCID: PMC6839917 DOI: 10.7554/elife.50634] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 09/27/2019] [Indexed: 12/14/2022] Open
Abstract
Soluble guanylate cyclase (sGC) is the primary receptor for nitric oxide (NO) in mammalian nitric oxide signaling. We determined structures of full-length Manduca sexta sGC in both inactive and active states using cryo-electron microscopy. NO and the sGC-specific stimulator YC-1 induce a 71° rotation of the heme-binding β H-NOX and PAS domains. Repositioning of the β H-NOX domain leads to a straightening of the coiled-coil domains, which, in turn, use the motion to move the catalytic domains into an active conformation. YC-1 binds directly between the β H-NOX domain and the two CC domains. The structural elongation of the particle observed in cryo-EM was corroborated in solution using small angle X-ray scattering (SAXS). These structures delineate the endpoints of the allosteric transition responsible for the major cyclic GMP-dependent physiological effects of NO.
Collapse
Affiliation(s)
- Benjamin G Horst
- Department of ChemistryUniversity of California, BerkeleyBerkeleyUnited States
| | - Adam L Yokom
- Department of Molecular and Cell BiologyUniversity of California, BerkeleyBerkeleyUnited States
- Graduate Group in BiophysicsUniversity of California, BerkeleyBerkeleyUnited States
| | - Daniel J Rosenberg
- Molecular Biophysics and Integrated BioimagingLawrence Berkeley National LaboratoryBerkeleyUnited States
- California Institute for Quantitative BiosciencesUniversity of California, BerkeleyBerkeleyUnited States
| | - Kyle L Morris
- Department of Molecular and Cell BiologyUniversity of California, BerkeleyBerkeleyUnited States
- Graduate Group in BiophysicsUniversity of California, BerkeleyBerkeleyUnited States
| | - Michal Hammel
- Molecular Biophysics and Integrated BioimagingLawrence Berkeley National LaboratoryBerkeleyUnited States
| | - James H Hurley
- Department of Molecular and Cell BiologyUniversity of California, BerkeleyBerkeleyUnited States
- Graduate Group in BiophysicsUniversity of California, BerkeleyBerkeleyUnited States
- Molecular Biophysics and Integrated BioimagingLawrence Berkeley National LaboratoryBerkeleyUnited States
- California Institute for Quantitative BiosciencesUniversity of California, BerkeleyBerkeleyUnited States
| | - Michael A Marletta
- Department of ChemistryUniversity of California, BerkeleyBerkeleyUnited States
- Department of Molecular and Cell BiologyUniversity of California, BerkeleyBerkeleyUnited States
- Graduate Group in BiophysicsUniversity of California, BerkeleyBerkeleyUnited States
| |
Collapse
|
15
|
Structural insights into the mechanism of human soluble guanylate cyclase. Nature 2019; 574:206-210. [PMID: 31514202 DOI: 10.1038/s41586-019-1584-6] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 09/03/2019] [Indexed: 01/01/2023]
Abstract
Soluble guanylate cyclase (sGC) is the primary sensor of nitric oxide. It has a central role in nitric oxide signalling and has been implicated in many essential physiological processes and disease conditions. The binding of nitric oxide boosts the enzymatic activity of sGC. However, the mechanism by which nitric oxide activates the enzyme is unclear. Here we report the cryo-electron microscopy structures of the human sGCα1β1 heterodimer in different functional states. These structures revealed that the transducer module bridges the nitric oxide sensor module and the catalytic module. Binding of nitric oxide to the β1 haem-nitric oxide and oxygen binding (H-NOX) domain triggers the structural rearrangement of the sensor module and a conformational switch of the transducer module from bending to straightening. The resulting movement of the N termini of the catalytic domains drives structural changes within the catalytic module, which in turn boost the enzymatic activity of sGC.
Collapse
|
16
|
Weichsel A, Kievenaar JA, Curry R, Croft JT, Montfort WR. Instability in a coiled-coil signaling helix is conserved for signal transduction in soluble guanylyl cyclase. Protein Sci 2019; 28:1830-1839. [PMID: 31411784 DOI: 10.1002/pro.3707] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/10/2019] [Accepted: 08/12/2019] [Indexed: 01/01/2023]
Abstract
How nitric oxide (NO) activates its primary receptor, α1/β1 soluble guanylyl cyclase (sGC or GC-1), remains unknown. Likewise, how stimulatory compounds enhance sGC activity is poorly understood, hampering development of new treatments for cardiovascular disease. NO binding to ferrous heme near the N-terminus in sGC activates cyclase activity near the C-terminus, yielding cGMP production and physiological response. CO binding can also stimulate sGC, but only weakly in the absence of stimulatory small-molecule compounds, which together lead to full activation. How ligand binding enhances catalysis, however, has yet to be discovered. Here, using a truncated version of sGC from Manduca sexta, we demonstrate that the central coiled-coil domain, the most highly conserved region of the ~150,000 Da protein, not only provides stability to the heterodimer but is also conformationally active in signal transduction. Sequence conservation in the coiled coil includes the expected heptad-repeating pattern for coiled-coil motifs, but also invariant positions that disfavor coiled-coil stability. Full-length coiled coil dampens CO affinity for heme, while shortening of the coiled coil leads to enhanced CO binding. Introducing double mutation αE447L/βE377L, predicted to replace two destabilizing glutamates with leucines, lowers CO binding affinity while increasing overall protein stability. Likewise, introduction of a disulfide bond into the coiled coil results in reduced CO affinity. Taken together, we demonstrate that the heme domain is greatly influenced by coiled-coil conformation, suggesting communication between heme and catalytic domains is through the coiled coil. Highly conserved structural imperfections in the coiled coil provide needed flexibility for signal transduction.
Collapse
Affiliation(s)
- Andrzej Weichsel
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona
| | - Jessica A Kievenaar
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona
| | - Roslyn Curry
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona
| | - Jacob T Croft
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona
| | - William R Montfort
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona
| |
Collapse
|
17
|
Khalid RR, Maryam A, Fadouloglou VE, Siddiqi AR, Zhang Y. Cryo-EM density map fitting driven in-silico structure of human soluble guanylate cyclase (hsGC) reveals functional aspects of inter-domain cross talk upon NO binding. J Mol Graph Model 2019; 90:109-119. [PMID: 31055154 PMCID: PMC7956049 DOI: 10.1016/j.jmgm.2019.04.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 04/05/2019] [Accepted: 04/17/2019] [Indexed: 01/19/2023]
Abstract
The human soluble Guanylate Cyclase (hsGC) is a heterodimeric heme-containing enzyme which regulates many important physiological processes. In eukaryotes, hsGC is the only known receptor for nitric oxide (NO) signaling. Improper NO signaling results in various disease conditions such as neurodegeneration, hypertension, stroke and erectile dysfunction. To understand the mechanisms of these diseases, structure determination of the hsGC dimer complex is crucial. However, so far all the attempts for the experimental structure determination of the protein were unsuccessful. The current study explores the possibility to model the quaternary structure of hsGC using a hybrid approach that combines state-of-the-art protein structure prediction tools with cryo-EM experimental data. The resultant 3D model shows close consistency with structural and functional insights extracted from biochemistry experiment data. Overall, the atomic-level complex structure determination of hsGC helps to unveil the inter-domain communication upon NO binding, which should be of important usefulness for elucidating the biological function of this important enzyme and for developing new treatments against the hsGC associated human diseases.
Collapse
Affiliation(s)
- Rana Rehan Khalid
- Department of Biosciences, COMSATS University, Islamabad, 45550, Pakistan; Department of Biostatistics and Medical Informatics, Acibadem Universitesi, Istanbul, 34752, Turkey; Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, 48109-2218, USA.
| | - Arooma Maryam
- Department of Biosciences, COMSATS University, Islamabad, 45550, Pakistan; Department of Pharmaceutical Chemistry, Biruni Universitesi, Istanbul, 34010, Turkey.
| | - Vasiliki E Fadouloglou
- Department of Molecular Biology and Genetics, Democritus University of Thrace, University Campus, Alexandroupolis, 68100, Greece.
| | - Abdul Rauf Siddiqi
- Department of Biosciences, COMSATS University, Islamabad, 45550, Pakistan.
| | - Yang Zhang
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, 48109-2218, USA.
| |
Collapse
|
18
|
Duda T, Pertzev A, Ravichandran S, Sharma RK. Ca 2+-Sensor Neurocalcin δ and Hormone ANF Modulate ANF-RGC Activity by Diverse Pathways: Role of the Signaling Helix Domain. Front Mol Neurosci 2018; 11:430. [PMID: 30546296 PMCID: PMC6278801 DOI: 10.3389/fnmol.2018.00430] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 11/05/2018] [Indexed: 11/24/2022] Open
Abstract
Prototype member of the membrane guanylate cyclase family, ANF-RGC (Atrial Natriuretic Factor Receptor Guanylate Cyclase), is the physiological signal transducer of two most hypotensive hormones ANF and BNP, and of the intracellular free Ca2+. Both the hormonal and the Ca2+-modulated signals operate through a common second messenger, cyclic GMP; yet, their operational modes are divergent. The hormonal pathways originate at the extracellular domain of the guanylate cyclase; and through a cascade of structural changes in its successive domains activate the C-terminal catalytic domain (CCD). In contrast, the Ca2+ signal operating via its sensor, myristoylated neurocalcin δ both originates and is translated directly at the CCD. Through a detailed sequential deletion and expression analyses, the present study examines the role of the signaling helix domain (SHD) in these two transduction pathways. SHD is a conserved 35-amino acid helical region of the guanylate cyclase, composed of five heptads, each meant to tune and transmit the hormonal signals to the CCD for their translation and generation of cyclic GMP. Its structure is homo-dimeric and the molecular docking analyses point out to the possibility of antiparallel arrangement of the helices. Contrary to the hormonal signaling, SHD has no role in regulation of the Ca2+- modulated pathway. The findings establish and define in molecular terms the presence of two distinct non-overlapping transduction modes of ANF-RGC, and for the first time demonstrate how differently they operate, and, yet generate cyclic GMP utilizing common CCD machinery.
Collapse
Affiliation(s)
- Teresa Duda
- Research Divisions of Biochemistry and Molecular Biology, The Unit of Regulatory and Molecular Biology, Salus University, Elkins Park, PA, United States
| | - Alexandre Pertzev
- Research Divisions of Biochemistry and Molecular Biology, The Unit of Regulatory and Molecular Biology, Salus University, Elkins Park, PA, United States
| | - Sarangan Ravichandran
- Advanced Biomedical Computational Sciences Group, Frederick National Laboratory for Cancer Research Sponsored by the National Cancer Institute, Leidos Biomedical Research Inc., Fredrick, MD, United States
| | - Rameshwar K Sharma
- Research Divisions of Biochemistry and Molecular Biology, The Unit of Regulatory and Molecular Biology, Salus University, Elkins Park, PA, United States
| |
Collapse
|
19
|
Horst BG, Marletta MA. Physiological activation and deactivation of soluble guanylate cyclase. Nitric Oxide 2018; 77:65-74. [PMID: 29704567 PMCID: PMC6919197 DOI: 10.1016/j.niox.2018.04.011] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 04/23/2018] [Accepted: 04/23/2018] [Indexed: 01/24/2023]
Abstract
Soluble guanylate cyclase (sGC) is responsible for transducing the gaseous signaling molecule nitric oxide (NO) into the ubiquitous secondary signaling messenger cyclic guanosine monophosphate in eukaryotic organisms. sGC is exquisitely tuned to respond to low levels of NO, allowing cells to respond to non-toxic levels of NO. In this review, the structure of sGC is discussed in the context of sGC activation and deactivation. The sequence of events in the activation pathway are described into a comprehensive model of in vivo sGC activation as elucidated both from studies with purified enzyme and those done in cells. This model is then used to discuss the deactivation of sGC, as well as the molecular mechanisms of pathophysiological deactivation.
Collapse
Affiliation(s)
- Benjamin G Horst
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA
| | - Michael A Marletta
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA; Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, USA; California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley, CA, USA.
| |
Collapse
|
20
|
Sömmer A, Behrends S. Methods to investigate structure and activation dynamics of GC-1/GC-2. Nitric Oxide 2018; 78:S1089-8603(17)30348-8. [PMID: 29705716 DOI: 10.1016/j.niox.2018.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 04/19/2018] [Accepted: 04/23/2018] [Indexed: 12/18/2022]
Abstract
Soluble guanylyl cyclase (sGC) is a heterodimeric enzyme consisting of one α and one β subunit. The α1β1 (GC-1) and α2β1 (GC-2) heterodimers are important for NO signaling in humans and catalyse the conversion from GTP to cGMP. Each sGC subunit consists of four domains. Several crystal structures of the isolated domains are available. However, crystals of full-length sGC have failed to materialise. In consequence, the detailed three dimensional structure of sGC remains unknown to date. Different techniques including stopped-flow spectroscopy, Förster-resonance energy transfer, direct fluorescence, analytical ultracentrifugation, chemical cross-linking, small-angle X-ray scattering, electron microscopy, hydrogen-deuterium exchange and protein thermal shift assays, were used to collect indirect information. Taken together, this circumstantial evidence from different groups brings forth a plausible model of sGC domain arrangement, spatial orientation and dynamic rearrangement upon activation. For analysis of the active conformation the stable binding mode of sGC activators has a significant methodological advantage over the transient, elusive, complex and highly concentration dependent effects of NO in many applications. The methods used and the results obtained are reviewed and discussed in this article.
Collapse
Affiliation(s)
- Anne Sömmer
- Department of Pharmacology, Toxicology and Clinical Pharmacy, University of Braunschweig - Institute of Technology, Germany.
| | - Sönke Behrends
- Department of Pharmacology, Toxicology and Clinical Pharmacy, University of Braunschweig - Institute of Technology, Germany.
| |
Collapse
|
21
|
Childers KC, Garcin ED. Structure/function of the soluble guanylyl cyclase catalytic domain. Nitric Oxide 2018; 77:53-64. [PMID: 29702251 PMCID: PMC6005667 DOI: 10.1016/j.niox.2018.04.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 02/06/2023]
Abstract
Soluble guanylyl cyclase (GC-1) is the primary receptor of nitric oxide (NO) in smooth muscle cells and maintains vascular function by inducing vasorelaxation in nearby blood vessels. GC-1 converts guanosine 5′-triphosphate (GTP) into cyclic guanosine 3′,5′-monophosphate (cGMP), which acts as a second messenger to improve blood flow. While much work has been done to characterize this pathway, we lack a mechanistic understanding of how NO binding to the heme domain leads to a large increase in activity at the C-terminal catalytic domain. Recent structural evidence and activity measurements from multiple groups have revealed a low-activity cyclase domain that requires additional GC-1 domains to promote a catalytically-competent conformation. How the catalytic domain structurally transitions into the active conformation requires further characterization. This review focuses on structure/function studies of the GC-1 catalytic domain and recent advances various groups have made in understanding how catalytic activity is regulated including small molecules interactions, Cys-S-NO modifications and potential interactions with the NO-sensor domain and other proteins.
Collapse
Affiliation(s)
- Kenneth C Childers
- University of Maryland Baltimore County, Department of Chemistry and Biochemistry, Baltimore, USA
| | - Elsa D Garcin
- University of Maryland Baltimore County, Department of Chemistry and Biochemistry, Baltimore, USA.
| |
Collapse
|
22
|
Sömmer A, Behrends S. Synergistic stabilisation of NOsGC by cinaciguat and non-hydrolysable nucleotides: Evidence for sGC activator-induced communication between the heme-binding and catalytic domains. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1866:702-711. [PMID: 29653192 DOI: 10.1016/j.bbapap.2018.03.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 03/16/2018] [Accepted: 03/31/2018] [Indexed: 11/29/2022]
Abstract
Nitric oxide sensitive guanylyl cyclase (NOsGC) is a heterodimeric enzyme consisting of one α and one β subunit. Each subunit consists of four domains: the N-terminal heme-nitric oxide oxygen binding (HNOX) domain, a PAS domain, a coiled-coil domain and the C-terminal catalytic domain. Upon activation by the endogenous ligand NO or activating drugs, NOsGC catalyses the conversion of GTP to cGMP. Although several crystal structures of the isolated domains are known, the structure of the full-length enzyme and the interdomain conformational changes during activation remain unsolved to date. In the current study, we performed protein thermal shift assays of purified NOsGC to identify discrete conformational states amenable to further analysis e.g. by crystallisation. A non-hydrolysable substrate analogue binding to the catalytic domain led to a subtle change in melting temperature. An activator drug binding to the HNOX domain led to a small increase. However, the combination of substrate analogue and activator drug led to a marked synergistic increase from 51 °C to 60 °C. This suggests reciprocal communication between HNOX domain and catalytic domain and formation of a stable activated conformation amenable to further biophysical characterization.
Collapse
Affiliation(s)
- Anne Sömmer
- Department of Pharmacology, Toxicology and Clinical Pharmacy, University of Braunschweig - Institute of Technology, Germany.
| | - Sönke Behrends
- Department of Pharmacology, Toxicology and Clinical Pharmacy, University of Braunschweig - Institute of Technology, Germany.
| |
Collapse
|
23
|
Shah RC, Sanker S, Wood KC, Durgin BG, Straub AC. Redox regulation of soluble guanylyl cyclase. Nitric Oxide 2018; 76:97-104. [PMID: 29578056 DOI: 10.1016/j.niox.2018.03.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 02/28/2018] [Accepted: 03/19/2018] [Indexed: 11/15/2022]
Abstract
The nitric oxide/soluble guanylyl cyclase (NO-sGC) signaling pathway regulates the cardiovascular, neuronal, and gastrointestinal systems. Impaired sGC signaling can result in disease and system-wide organ failure. This review seeks to examine the redox control of sGC through heme and cysteine regulation while discussing therapeutic drugs that target various conditions. Heme regulation involves mechanisms of insertion of the heme moiety into the sGC protein, the molecules and proteins that control switching between the oxidized (Fe3+) and reduced states (Fe2+), and the activity of heme degradation. Modifications to cysteine residues by S-nitrosation on the α1 and β1 subunits of sGC have been shown to be important in sGC signaling. Moreover, redox balance and localization of sGC is thought to control downstream effects. In response to altered sGC activity due to changes in the redox state, many therapeutic drugs have been developed to target decreased NO-sGC signaling. The importance and relevance of sGC continues to grow as sGC dysregulation leads to numerous disease conditions.
Collapse
Affiliation(s)
- Rohan C Shah
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Subramaniam Sanker
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Katherine C Wood
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Brittany G Durgin
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Adam C Straub
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA.
| |
Collapse
|
24
|
Bassler J, Schultz JE, Lupas AN. Adenylate cyclases: Receivers, transducers, and generators of signals. Cell Signal 2018; 46:135-144. [PMID: 29563061 DOI: 10.1016/j.cellsig.2018.03.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 03/09/2018] [Accepted: 03/12/2018] [Indexed: 11/18/2022]
Abstract
Class III adenylate cyclases (ACs) are widespread signaling proteins, which translate diverse intracellular and extracellular stimuli into a uniform intracellular signal. They are typically composed of an N-terminal array of input domains and transducers, followed C-terminally by a catalytic domain, which, as a dimer, generates the second messenger cAMP. The input domains, which receive stimuli, and the transducers, which propagate the signals, are often found in other signaling proteins. The nature of stimuli and the regulatory mechanisms of ACs have been studied experimentally in only a few cases, and even in these, important questions remain open, such as whether eukaryotic ACs regulated by G protein-coupled receptors can also receive stimuli through their own membrane domains. Here we survey the current knowledge on regulation and intramolecular signal propagation in ACs and draw comparisons to other signaling proteins. We highlight the pivotal role of a recently identified cyclase-specific transducer element located N-terminally of many AC catalytic domains, suggesting an intramolecular signaling capacity.
Collapse
Affiliation(s)
- Jens Bassler
- Max-Planck-Institut für Entwicklungsbiologie, Abt. Proteinevolution, Max-Planck-Ring 5, 72076 Tübingen, Germany
| | - Joachim E Schultz
- Pharmazeutisches Institut der Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany.
| | - Andrei N Lupas
- Max-Planck-Institut für Entwicklungsbiologie, Abt. Proteinevolution, Max-Planck-Ring 5, 72076 Tübingen, Germany.
| |
Collapse
|
25
|
Sharon D, Wimberg H, Kinarty Y, Koch KW. Genotype-functional-phenotype correlations in photoreceptor guanylate cyclase (GC-E) encoded by GUCY2D. Prog Retin Eye Res 2018; 63:69-91. [DOI: 10.1016/j.preteyeres.2017.10.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 10/16/2017] [Accepted: 10/16/2017] [Indexed: 01/09/2023]
|
26
|
Vercellino I, Rezabkova L, Olieric V, Polyhach Y, Weinert T, Kammerer RA, Jeschke G, Korkhov VM. Role of the nucleotidyl cyclase helical domain in catalytically active dimer formation. Proc Natl Acad Sci U S A 2017; 114:E9821-E9828. [PMID: 29087332 PMCID: PMC5699072 DOI: 10.1073/pnas.1712621114] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Nucleotidyl cyclases, including membrane-integral and soluble adenylyl and guanylyl cyclases, are central components in a wide range of signaling pathways. These proteins are architecturally diverse, yet many of them share a conserved feature, a helical region that precedes the catalytic cyclase domain. The role of this region in cyclase dimerization has been a subject of debate. Although mutations within this region in various cyclases have been linked to genetic diseases, the molecular details of their effects on the enzymes remain unknown. Here, we report an X-ray structure of the cytosolic portion of the membrane-integral adenylyl cyclase Cya from Mycobacterium intracellulare in a nucleotide-bound state. The helical domains of each Cya monomer form a tight hairpin, bringing the two catalytic domains into an active dimerized state. Mutations in the helical domain of Cya mimic the disease-related mutations in human proteins, recapitulating the profiles of the corresponding mutated enzymes, adenylyl cyclase-5 and retinal guanylyl cyclase-1. Our experiments with full-length Cya and its cytosolic domain link the mutations to protein stability, and the ability to induce an active dimeric conformation of the catalytic domains. Sequence conservation indicates that this domain is an integral part of cyclase machinery across protein families and species. Our study provides evidence for a role of the helical domain in establishing a catalytically competent dimeric cyclase conformation. Our results also suggest that the disease-associated mutations in the corresponding regions of human nucleotidyl cyclases disrupt the normal helical domain structure.
Collapse
Affiliation(s)
- Irene Vercellino
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Lenka Rezabkova
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Vincent Olieric
- Macromolecular Crystallography Group, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Yevhen Polyhach
- Laboratory of Physical Chemistry, Swiss Federal Institute of Technology in Zurich (ETH Zurich), 8093 Zurich, Switzerland
| | - Tobias Weinert
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Richard A Kammerer
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Gunnar Jeschke
- Laboratory of Physical Chemistry, Swiss Federal Institute of Technology in Zurich (ETH Zurich), 8093 Zurich, Switzerland
| | - Volodymyr M Korkhov
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland;
- Institute of Biochemistry, ETH Zurich, 8093 Zurich, Switzerland
| |
Collapse
|
27
|
Ziegler M, Bassler J, Beltz S, Schultz A, Lupas AN, Schultz JE. Characterization of a novel signal transducer element intrinsic to class IIIa/b adenylate cyclases and guanylate cyclases. FEBS J 2017; 284:1204-1217. [PMID: 28222489 DOI: 10.1111/febs.14047] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 01/09/2017] [Accepted: 02/17/2017] [Indexed: 11/28/2022]
Abstract
Adenylate cyclases (ACs) are signaling proteins that produce the second messenger cAMP. Class III ACs comprise four groups (class IIIa-d) of which class IIIa and IIIb ACs have been identified in bacteria and eukaryotes. Many class IIIa ACs are anchored to membranes via hexahelical domains. In eukaryotic ACs, membrane anchors are well conserved, suggesting that this region possesses important functional characteristics that are as yet unknown. To address this question, we replaced the hexahelical membrane anchor of the mycobacterial AC Rv1625c with the hexahelical quorum-sensing receptor from Legionella, LqsS. Using this chimera, we identified a novel 19-amino-acid cyclase transducer element (CTE) located N-terminally to the catalytic domain that links receptor stimulation to effector activation. Coupling of the receptor to the AC was possible at several positions distal to the membrane exit, resulting in stimulatory or inhibitory responses to the ligand Legionella autoinducer-1. In contrast, on the AC effector side functional coupling was only successful when starting with the CTE. Bioinformatics approaches established that distinct CTEs are widely present in class IIIa and IIIb ACs and in vertebrate guanylate cyclases. The data suggest that membrane-delimited receiver domains transduce regulatory signals to the downstream catalytic domains in an engineered AC model system. This may suggest a previously unknown mechanism for cellular cAMP regulation.
Collapse
Affiliation(s)
- Miriam Ziegler
- Pharmazeutisches Institut der Universität Tübingen, Germany
| | - Jens Bassler
- Max-Planck-Institut für Entwicklungsbiologie, Tübingen, Germany
| | | | - Anita Schultz
- Pharmazeutisches Institut der Universität Tübingen, Germany
| | - Andrei N Lupas
- Max-Planck-Institut für Entwicklungsbiologie, Tübingen, Germany
| | | |
Collapse
|
28
|
Probing the Molecular Mechanism of Human Soluble Guanylate Cyclase Activation by NO in vitro and in vivo. Sci Rep 2017; 7:43112. [PMID: 28230071 PMCID: PMC5322342 DOI: 10.1038/srep43112] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 01/19/2017] [Indexed: 11/12/2022] Open
Abstract
Soluble guanylate cyclase (sGC) is a heme-containing metalloprotein in NO-sGC-cGMP signaling. NO binds to the heme of sGC to catalyze the synthesis of the second messenger cGMP, which plays a critical role in several physiological processes. However, the molecular mechanism for sGC to mediate the NO signaling remains unclear. Here fluorophore FlAsH-EDT2 and fluorescent proteins were employed to study the NO-induced sGC activation. FlAsH-EDT2 labeling study revealed that NO binding to the H-NOX domain of sGC increased the distance between H-NOX and PAS domain and the separation between H-NOX and coiled-coil domain. The heme pocket conformation changed from “closed” to “open” upon NO binding. In addition, the NO-induced conformational change of sGC was firstly investigated in vivo through fluorescence lifetime imaging microscopy. The results both in vitro and in vivo indicated the conformational change of the catalytic domain of sGC from “open” to “closed” upon NO binding. NO binding to the heme of H-NOX domain caused breaking of Fe-N coordination bond, initiated the domain moving and conformational change, induced the allosteric effect of sGC to trigger the NO-signaling from H-NOX via PAS & coiled-coil to the catalytic domain, and ultimately stimulates the cyclase activity of sGC.
Collapse
|
29
|
Montfort WR, Wales JA, Weichsel A. Structure and Activation of Soluble Guanylyl Cyclase, the Nitric Oxide Sensor. Antioxid Redox Signal 2017; 26:107-121. [PMID: 26979942 PMCID: PMC5240008 DOI: 10.1089/ars.2016.6693] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
SIGNIFICANCE Soluble guanylyl/guanylate cyclase (sGC) is the primary receptor for nitric oxide (NO) and is central to the physiology of blood pressure regulation, wound healing, memory formation, and other key physiological activities. sGC is increasingly implicated in disease and is targeted by novel therapeutic compounds. The protein displays a rich evolutionary history and a fascinating signal transduction mechanism, with NO binding to an N-terminal heme-containing domain, which activates the C-terminal cyclase domains. Recent Advances: Crystal structures of individual sGC domains or their bacterial homologues coupled with small-angle x-ray scattering, electron microscopy, chemical cross-linking, and Förster resonance energy transfer measurements are yielding insight into the overall structure for sGC, which is elongated and likely quite dynamic. Transient kinetic measurements reveal a role for individual domains in lowering NO affinity for heme. New sGC stimulatory drugs are now in the clinic and appear to function through binding near or directly to the sGC heme domain, relieving inhibitory contacts with other domains. New sGC-activating drugs show promise for recovering oxidized sGC in diseases with high inflammation by replacing lost heme. CRITICAL ISSUES Despite the many recent advances, sGC regulation, NO activation, and mechanisms of drug binding remain unclear. Here, we describe the molecular evolution of sGC, new molecular models, and the linked equilibria between sGC NO binding, drug binding, and catalytic activity. FUTURE DIRECTIONS Recent results and ongoing studies lay the foundation for a complete understanding of structure and mechanism, and they open the door for new drug discovery targeting sGC. Antioxid. Redox Signal. 26, 107-121.
Collapse
Affiliation(s)
- William R Montfort
- Department of Chemistry and Biochemistry, University of Arizona , Tucson, Arizona
| | - Jessica A Wales
- Department of Chemistry and Biochemistry, University of Arizona , Tucson, Arizona
| | - Andrzej Weichsel
- Department of Chemistry and Biochemistry, University of Arizona , Tucson, Arizona
| |
Collapse
|
30
|
Vijayaraghavan J, Kramp K, Harris ME, van den Akker F. Inhibition of soluble guanylyl cyclase by small molecules targeting the catalytic domain. FEBS Lett 2016; 590:3669-3680. [PMID: 27654641 DOI: 10.1002/1873-3468.12427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 08/29/2016] [Accepted: 09/09/2016] [Indexed: 12/23/2022]
Abstract
Soluble guanylyl cyclase (sGC) plays a crucial role in cyclic nucleotide signaling that regulates numerous important physiological processes. To identify new sGC inhibitors that may prevent the formation of the active catalytic domain conformation, we carried out an in silico docking screen targeting a 'backside pocket' of the inactive sGC catalytic domain structure. Compounds 1 and 2 were discovered to inhibit sGC even at high/saturating nitric oxide concentrations. Both compounds also inhibit the BAY 58-2667-activated sGC as well as BAY 41-2272-stimulated sGC activity. Additional biochemical analyses showed that compound 2 also inhibits the isolated catalytic domain, thus demonstrating functional binding to this domain. Both compounds have micromolar affinity for sGC and are potential leads to develop more potent sGC inhibitors.
Collapse
Affiliation(s)
| | - Kristopher Kramp
- Department of Biochemistry, Case Western Reserve University, Cleveland, OH, USA
| | - Michael E Harris
- Department of Biochemistry, Case Western Reserve University, Cleveland, OH, USA
| | - Focco van den Akker
- Department of Biochemistry, Case Western Reserve University, Cleveland, OH, USA.
| |
Collapse
|
31
|
Agulló L, Buch I, Gutiérrez-de-Terán H, Garcia-Dorado D, Villà-Freixa J. Computational exploration of the binding mode of heme-dependent stimulators into the active catalytic domain of soluble guanylate cyclase. Proteins 2016; 84:1534-48. [PMID: 27364190 DOI: 10.1002/prot.25096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Revised: 06/22/2016] [Accepted: 06/28/2016] [Indexed: 11/08/2022]
Abstract
Soluble guanylate cyclase (sGC), the main target of nitric oxide (NO), has been proven to have a significant role in coronary artery disease, pulmonary hypertension, erectile dysfunction, and myocardial infarction. One of its agonists, BAY 41-2272 (Riociguat), has been recently approved for treatment of pulmonary arterial hypertension (PHA), while some others are in clinical phases of development. However, the location of the binding sites for the two known types of agonists, heme-dependent stimulators and heme-independent activators, is a matter of debate, particularly for the first group where both a location on the regulatory (H-NOX) and on the catalytic domain have been suggested by different authors. Here, we address its potential location on the catalytic domain, the unique well characterized at the structural level, by an "in silico" approach. Homology models of the catalytic domain of sGC in "inactive" or "active" conformations were constructed using the structure of previously described crystals of the catalytic domains of "inactive" sGCs (2WZ1, 3ET6) and of "active" adenylate cyclase (1CJU). Each model was submitted to six independent molecular dynamics simulations of about 1 μs. Docking of YC-1, a classic heme-dependent stimulator, to all frames of representative trajectories of "inactive" and "active" conformations, followed by calculation of absolute binding free energies with the linear interaction energy (LIE) method, revealed a potential high-affinity binding site on the "active" structure. The site, located between the pseudo-symmetric and the catalytic site just over the loop β2 -β3 , does not overlap with the forskolin binding site on adenylate cyclases. Proteins 2016; 84:1534-1548. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Luis Agulló
- Department of Systems Biology, U Science Tech, University of Vic - Central University of Catalonia (UVIC-UCC), Vic, 08500, Spain.
| | - Ignasi Buch
- Computational Biophysics Laboratory, Hospital Del Mar Medical Research Institute (IMIM), Barcelona, 08003, Spain
| | - Hugo Gutiérrez-de-Terán
- Department of Cell and Molecular Biology, Uppsala University, Uppsala Biomedicinska Centrum BMC, Uppsala, 75124, Sweden
| | - David Garcia-Dorado
- Cardiocirculatory Pathology Group, Vall D'Hebron Research Institute (VHIR), Barcelona, 08035, Spain
| | - Jordi Villà-Freixa
- Department of Systems Biology, U Science Tech, University of Vic - Central University of Catalonia (UVIC-UCC), Vic, 08500, Spain
| |
Collapse
|
32
|
Pan J, Zhang X, Yuan H, Xu Q, Zhang H, Zhou Y, Huang ZX, Tan X. The molecular mechanism of heme loss from oxidized soluble guanylate cyclase induced by conformational change. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2016; 1864:488-500. [PMID: 26876536 DOI: 10.1016/j.bbapap.2016.02.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 02/05/2016] [Accepted: 02/10/2016] [Indexed: 11/25/2022]
Abstract
Heme oxidation and loss of soluble guanylate cyclase (sGC) is thought to be an important contributor to the development of cardiovascular diseases. Nevertheless, it remains unknown why the heme loses readily in oxidized sGC. In the current study, the conformational change of sGC upon heme oxidation by ODQ was studied based on the fluorescence resonance energy transfer (FRET) between the heme and a fluorophore fluorescein arsenical helix binder (FlAsH-EDT2) labeled at different domains of sGC β1. This study provides an opportunity to monitor the domain movement of sGC relative to the heme. The results indicated that heme oxidation by ODQ in truncated sCC induced the heme-associated αF helix moving away from the heme, the Per/Arnt/Sim domain (PAS) domain moving closer to the heme, but led the helical domain going further from the heme. We proposed that the synergistic effect of these conformational changes of the discrete region upon heme oxidation forces the heme pocket open, and subsequent heme loss readily. Furthermore, the kinetic studies suggested that the heme oxidation was a fast process and the conformational change was a relatively slow process. The kinetics of heme loss from oxidized sGC was monitored by a new method based on the heme group de-quenching the fluorescence of FlAsH-EDT2.
Collapse
Affiliation(s)
- Jie Pan
- Department of Chemistry & Shanghai Key laboratory of Chemical Biology for Protein Science, Fudan University, Shanghai 200433, China
| | - Xiaoxue Zhang
- Department of Chemistry & Shanghai Key laboratory of Chemical Biology for Protein Science, Fudan University, Shanghai 200433, China
| | - Hong Yuan
- Department of Chemistry & Shanghai Key laboratory of Chemical Biology for Protein Science, Fudan University, Shanghai 200433, China
| | - Qiming Xu
- Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
| | - Huijuan Zhang
- Department of Chemistry & Shanghai Key laboratory of Chemical Biology for Protein Science, Fudan University, Shanghai 200433, China
| | - Yajun Zhou
- Department of Chemistry & Shanghai Key laboratory of Chemical Biology for Protein Science, Fudan University, Shanghai 200433, China
| | - Zhong-Xian Huang
- Department of Chemistry & Shanghai Key laboratory of Chemical Biology for Protein Science, Fudan University, Shanghai 200433, China
| | - Xiangshi Tan
- Department of Chemistry & Shanghai Key laboratory of Chemical Biology for Protein Science, Fudan University, Shanghai 200433, China; Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China.
| |
Collapse
|
33
|
Koch KW, Dell'Orco D. Protein and Signaling Networks in Vertebrate Photoreceptor Cells. Front Mol Neurosci 2015; 8:67. [PMID: 26635520 PMCID: PMC4646965 DOI: 10.3389/fnmol.2015.00067] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 10/26/2015] [Indexed: 01/10/2023] Open
Abstract
Vertebrate photoreceptor cells are exquisite light detectors operating under very dim and bright illumination. The photoexcitation and adaptation machinery in photoreceptor cells consists of protein complexes that can form highly ordered supramolecular structures and control the homeostasis and mutual dependence of the secondary messengers cyclic guanosine monophosphate (cGMP) and Ca2+. The visual pigment in rod photoreceptors, the G protein-coupled receptor rhodopsin is organized in tracks of dimers thereby providing a signaling platform for the dynamic scaffolding of the G protein transducin. Illuminated rhodopsin is turned off by phosphorylation catalyzed by rhodopsin kinase (GRK1) under control of Ca2+-recoverin. The GRK1 protein complex partly assembles in lipid raft structures, where shutting off rhodopsin seems to be more effective. Re-synthesis of cGMP is another crucial step in the recovery of the photoresponse after illumination. It is catalyzed by membrane bound sensory guanylate cyclases (GCs) and is regulated by specific neuronal Ca2+-sensor proteins called guanylate cyclase-activating proteins (GCAPs). At least one GC (ROS-GC1) was shown to be part of a multiprotein complex having strong interactions with the cytoskeleton and being controlled in a multimodal Ca2+-dependent fashion. The final target of the cGMP signaling cascade is a cyclic nucleotide-gated (CNG) channel that is a hetero-oligomeric protein located in the plasma membrane and interacting with accessory proteins in highly organized microdomains. We summarize results and interpretations of findings related to the inhomogeneous organization of signaling units in photoreceptor outer segments.
Collapse
Affiliation(s)
- Karl-Wilhelm Koch
- Department of Neurosciences, Biochemistry Group, University of Oldenburg Oldenburg, Germany
| | - Daniele Dell'Orco
- Department of Neurological, Biomedical and Movement Sciences, Section of Biological Chemistry and Center for BioMedical Computing (CBMC), University of Verona Verona, Italy
| |
Collapse
|
34
|
Sarkar A, Dai Y, Haque MM, Seeger F, Ghosh A, Garcin ED, Montfort WR, Hazen SL, Misra S, Stuehr DJ. Heat Shock Protein 90 Associates with the Per-Arnt-Sim Domain of Heme-free Soluble Guanylate Cyclase: IMplications for Enzyme Maturation. J Biol Chem 2015; 290:21615-28. [PMID: 26134567 DOI: 10.1074/jbc.m115.645515] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Indexed: 11/06/2022] Open
Abstract
Heat shock protein 90 (hsp90) drives heme insertion into the β1 subunit of soluble guanylate cyclase (sGC) β1, which enables it to associate with a partner sGCα1 subunit and mature into a nitric oxide (NO)-responsive active form. We utilized fluorescence polarization measurements and hydrogen-deuterium exchange mass spectrometry to define molecular interactions between the specific human isoforms hsp90β and apo-sGCβ1. hsp90β and its isolated M domain, but not its isolated N and C domains, bind with low micromolar affinity to a heme-free, truncated version of sGCβ1 (sGCβ1(1-359)-H105F). Surprisingly, hsp90β and its M domain bound to the Per-Arnt-Sim (PAS) domain of apo-sGC-β1(1-359), which lies adjacent to its heme-binding (H-NOX) domain. The interaction specifically involved solvent-exposed regions in the hsp90β M domain that are largely distinct from sites utilized by other hsp90 clients. The interaction strongly protected two regions of the sGCβ1 PAS domain and caused local structural relaxation in other regions, including a PAS dimerization interface and a segment in the H-NOX domain. Our results suggest a means by which the hsp90β interaction could prevent apo-sGCβ1 from associating with its partner sGCα1 subunit while enabling structural changes to assist heme insertion into the H-NOX domain. This mechanism would parallel that in other clients like the aryl hydrocarbon receptor and HIF1α, which also interact with hsp90 through their PAS domains to control protein partner and small ligand binding interactions.
Collapse
Affiliation(s)
| | - Yue Dai
- From the Departments of Pathobiology
| | | | - Franziska Seeger
- the Department of Chemistry and Biochemistry, University of Maryland at Baltimore County, Baltimore, Maryland 21250, and
| | | | - Elsa D Garcin
- the Department of Chemistry and Biochemistry, University of Maryland at Baltimore County, Baltimore, Maryland 21250, and
| | - William R Montfort
- the Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721
| | | | - Saurav Misra
- Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | | |
Collapse
|
35
|
Wobst J, Rumpf PM, Dang TA, Segura-Puimedon M, Erdmann J, Schunkert H. Molecular variants of soluble guanylyl cyclase affecting cardiovascular risk. Circ J 2015; 79:463-9. [PMID: 25746521 DOI: 10.1253/circj.cj-15-0025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Soluble guanylyl cyclase (sGC) is the physiological receptor for nitric oxide (NO) and NO-releasing drugs, and is a key enzyme in several cardiovascular signaling pathways. Its activation induces the synthesis of the second messenger cGMP. cGMP regulates the activity of various downstream proteins, including cGMP-dependent protein kinase G, cGMP-dependent phosphodiesterases and cyclic nucleotide gated ion channels leading to vascular relaxation, inhibition of platelet aggregation, and modified neurotransmission. Diminished sGC function contributes to a number of disorders, including cardiovascular diseases. Knowledge of its regulation is a prerequisite for understanding the pathophysiology of deficient sGC signaling. In this review we consolidate the available information on sGC signaling, including the molecular biology and genetics of sGC transcription, translation and function, including the effect of rare variants, and present possible new targets for the development of personalized medicine in vascular diseases.
Collapse
Affiliation(s)
- Jana Wobst
- Department of Cardiovascular Diseases, German Heart Center Munich, Technical University Munich
| | | | | | | | | | | |
Collapse
|
36
|
Structures of soluble guanylate cyclase: implications for regulatory mechanisms and drug development. Biochem Soc Trans 2014; 42:108-13. [PMID: 24450636 PMCID: PMC3901396 DOI: 10.1042/bst20130228] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Activation of cGMP synthesis leads to vasodilation, and is an important mechanism in clinical treatment of angina, heart failure, and severe peripheral and pulmonary hypertension. The nitric oxide-responsive sGC (soluble guanylate cyclase) has been the target of recent drug discovery efforts. The present review surveys recent data on the structure and regulation of sGC, and the prospects of new avenues for therapeutic intervention.
Collapse
|
37
|
Giedyk M, ó Proinsias K, Kurcoń S, Sharina I, Martin E, Gryko D. Small alterations in cobinamide structure considerably influence sGC activation. ChemMedChem 2014; 9:2344-50. [PMID: 25044578 DOI: 10.1002/cmdc.201402209] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Indexed: 11/07/2022]
Abstract
Specially designed B-ring-modified cobalamin derivatives were synthesized and tested as potential activators of soluble guanylyl cyclase (sGC). Herein, we disclose the influence of substituents at the c- and d-positions in hydrophilic and hydrophobic cobyrinic acid derivatives on their capacities to activate sGC. The presence of the amide group at c-/d-position in cobyrinic acid derivatives strongly influence the level of sGC activation. Removal of the d-position altogether has a profound effect for hydrophobic compounds. In contrast, little differences were observed in hydrophilic ones.
Collapse
Affiliation(s)
- Maciej Giedyk
- Institute of Organic Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw (Poland), Fax: (+48) 22-632-6681
| | | | | | | | | | | |
Collapse
|
38
|
A rhodopsin-guanylyl cyclase gene fusion functions in visual perception in a fungus. Curr Biol 2014; 24:1234-40. [PMID: 24835457 PMCID: PMC4046227 DOI: 10.1016/j.cub.2014.04.009] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 03/03/2014] [Accepted: 04/03/2014] [Indexed: 12/23/2022]
Abstract
Sensing light is the fundamental property of visual systems, with vision in animals being based almost exclusively on opsin photopigments [1]. Rhodopsin also acts as a photoreceptor linked to phototaxis in green algae [2, 3] and has been implicated by chemical means as a light sensor in the flagellated swimming zoospores of the fungus Allomyces reticulatus [4]; however, the signaling mechanism in these fungi remains unknown. Here we use a combination of genome sequencing and molecular inhibition experiments with light-sensing phenotype studies to examine the signaling pathway involved in visual perception in the closely related fungus Blastocladiella emersonii. Our data show that in these fungi, light perception is accomplished by the function of a novel gene fusion (BeGC1) of a type I (microbial) rhodopsin domain and guanylyl cyclase catalytic domain. Photobleaching of rhodopsin function prevents accumulation of cGMP levels and phototaxis of fungal zoospores exposed to green light, whereas inhibition of guanylyl cyclase activity negatively affects fungal phototaxis. Immunofluorescence microscopy localizes the BeGC1 protein to the external surface of the zoospore eyespot positioned close to the base of the swimming flagellum [4, 5], demonstrating this is a photoreceptive organelle composed of lipid droplets. Taken together, these data indicate that Blastocladiomycota fungi have a cGMP signaling pathway involved in phototaxis similar to the vertebrate vision-signaling cascade but composed of protein domain components arranged as a novel gene fusion architecture and of distant evolutionary ancestry to type II rhodopsins of animals.
Collapse
|
39
|
Rogers NM, Seeger F, Garcin ED, Roberts DD, Isenberg JS. Regulation of soluble guanylate cyclase by matricellular thrombospondins: implications for blood flow. Front Physiol 2014; 5:134. [PMID: 24772092 PMCID: PMC3983488 DOI: 10.3389/fphys.2014.00134] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 03/18/2014] [Indexed: 01/16/2023] Open
Abstract
Nitric oxide (NO) maintains cardiovascular health by activating soluble guanylate cyclase (sGC) to increase cellular cGMP levels. Cardiovascular disease is characterized by decreased NO-sGC-cGMP signaling. Pharmacological activators and stimulators of sGC are being actively pursued as therapies for acute heart failure and pulmonary hypertension. Here we review molecular mechanisms that modulate sGC activity while emphasizing a novel biochemical pathway in which binding of the matricellular protein thrombospondin-1 (TSP1) to the cell surface receptor CD47 causes inhibition of sGC. We discuss the therapeutic implications of this pathway for blood flow, tissue perfusion, and cell survival under physiologic and disease conditions.
Collapse
Affiliation(s)
- Natasha M Rogers
- Department of Medicine, Vascular Medicine Institute, University of Pittsburgh School of Medicine Pittsburgh, PA, USA
| | - Franziska Seeger
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County Baltimore, MD, USA
| | - Elsa D Garcin
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County Baltimore, MD, USA
| | - David D Roberts
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, NIH Bethesda, MD, USA
| | - Jeffrey S Isenberg
- Department of Medicine, Vascular Medicine Institute, University of Pittsburgh School of Medicine Pittsburgh, PA, USA ; Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh School of Medicine Pittsburgh, PA, USA
| |
Collapse
|
40
|
Seeger F, Quintyn R, Tanimoto A, Williams GJ, Tainer JA, Wysocki VH, Garcin ED. Interfacial residues promote an optimal alignment of the catalytic center in human soluble guanylate cyclase: heterodimerization is required but not sufficient for activity. Biochemistry 2014; 53:2153-65. [PMID: 24669844 PMCID: PMC3985721 DOI: 10.1021/bi500129k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
![]()
Soluble guanylate cyclase (sGC) plays
a central role in the cardiovascular
system and is a drug target for the treatment of pulmonary hypertension.
While the three-dimensional structure of sGC is unknown, studies suggest
that binding of the regulatory domain to the catalytic domain maintains
sGC in an autoinhibited basal state. The activation signal, binding
of NO to heme, is thought to be transmitted via the regulatory and
dimerization domains to the cyclase domain and unleashes the full
catalytic potential of sGC. Consequently, isolated catalytic domains
should show catalytic turnover comparable to that of activated sGC.
Using X-ray crystallography, activity measurements, and native mass
spectrometry, we show unambiguously that human isolated catalytic
domains are much less active than basal sGC, while still forming heterodimers.
We identified key structural elements regulating the dimer interface
and propose a novel role for residues located in an interfacial flap
and a hydrogen bond network as key modulators of the orientation of
the catalytic subunits. We demonstrate that even in the absence of
the regulatory domain, additional sGC domains are required to guide
the appropriate conformation of the catalytic subunits associated
with high activity. Our data support a novel regulatory mechanism
whereby sGC activity is tuned by distinct domain interactions that
either promote or inhibit catalytic activity. These results further
our understanding of heterodimerization and activation of sGC and
open additional drug discovery routes for targeting the NO–sGC–cGMP
pathway via the design of small molecules that promote a productive
conformation of the catalytic subunits or disrupt inhibitory domain
interactions.
Collapse
Affiliation(s)
- Franziska Seeger
- University of Maryland Baltimore County , Baltimore, Maryland 21250, United States
| | | | | | | | | | | | | |
Collapse
|
41
|
Underbakke ES, Iavarone AT, Chalmers MJ, Pascal BD, Novick S, Griffin PR, Marletta MA. Nitric oxide-induced conformational changes in soluble guanylate cyclase. Structure 2014; 22:602-11. [PMID: 24560804 DOI: 10.1016/j.str.2014.01.008] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 01/07/2014] [Accepted: 01/13/2014] [Indexed: 01/24/2023]
Abstract
Soluble guanylate cyclase (sGC) is the primary mediator of nitric oxide (NO) signaling. NO binds the sGC heme cofactor stimulating synthesis of the second messenger cyclic-GMP (cGMP). As the central hub of NO/cGMP signaling pathways, sGC is important in diverse physiological processes such as vasodilation and neurotransmission. Nevertheless, the mechanisms underlying NO-induced cyclase activation in sGC remain unclear. Here, hydrogen/deuterium exchange mass spectrometry (HDX-MS) was employed to probe the NO-induced conformational changes of sGC. HDX-MS revealed NO-induced effects in several discrete regions. NO binding to the heme-NO/O2-binding (H-NOX) domain perturbs a signaling surface implicated in Per/Arnt/Sim (PAS) domain interactions. Furthermore, NO elicits striking conformational changes in the junction between the PAS and helical domains that propagate as perturbations throughout the adjoining helices. Ultimately, NO binding stimulates the catalytic domain by contracting the active site pocket. Together, these conformational changes delineate an allosteric pathway linking NO binding to activation of the catalytic domain.
Collapse
Affiliation(s)
- Eric S Underbakke
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Anthony T Iavarone
- Department of Chemistry and California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Michael J Chalmers
- Department of Molecular Therapeutics, The Scripps Research Institute, Jupiter, FL 33458, USA
| | - Bruce D Pascal
- Department of Molecular Therapeutics, The Scripps Research Institute, Jupiter, FL 33458, USA
| | - Scott Novick
- Department of Molecular Therapeutics, The Scripps Research Institute, Jupiter, FL 33458, USA
| | - Patrick R Griffin
- Department of Molecular Therapeutics, The Scripps Research Institute, Jupiter, FL 33458, USA
| | - Michael A Marletta
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
| |
Collapse
|
42
|
Single-particle EM reveals the higher-order domain architecture of soluble guanylate cyclase. Proc Natl Acad Sci U S A 2014; 111:2960-5. [PMID: 24516165 DOI: 10.1073/pnas.1400711111] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Soluble guanylate cyclase (sGC) is the primary nitric oxide (NO) receptor in mammals and a central component of the NO-signaling pathway. The NO-signaling pathways mediate diverse physiological processes, including vasodilation, neurotransmission, and myocardial functions. sGC is a heterodimer assembled from two homologous subunits, each comprised of four domains. Although crystal structures of isolated domains have been reported, no structure is available for full-length sGC. We used single-particle electron microscopy to obtain the structure of the complete sGC heterodimer and determine its higher-order domain architecture. Overall, the protein is formed of two rigid modules: the catalytic dimer and the clustered Per/Art/Sim and heme-NO/O2-binding domains, connected by a parallel coiled coil at two hinge points. The quaternary assembly demonstrates a very high degree of flexibility. We captured hundreds of individual conformational snapshots of free sGC, NO-bound sGC, and guanosine-5'-[(α,β)-methylene]triphosphate-bound sGC. The molecular architecture and pronounced flexibility observed provides a significant step forward in understanding the mechanism of NO signaling.
Collapse
|
43
|
Purohit R, Fritz BG, The J, Issaian A, Weichsel A, David CL, Campbell E, Hausrath AC, Rassouli-Taylor L, Garcin ED, Gage MJ, Montfort WR. YC-1 binding to the β subunit of soluble guanylyl cyclase overcomes allosteric inhibition by the α subunit. Biochemistry 2013; 53:101-14. [PMID: 24328155 DOI: 10.1021/bi4015133] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Soluble guanylate cyclase (sGC) is a heterodimeric heme protein and the primary nitric oxide receptor. NO binding stimulates cyclase activity, leading to regulation of cardiovascular physiology and making sGC an attractive target for drug discovery. YC-1 and related compounds stimulate sGC both independently and synergistically with NO and CO binding; however, where the compounds bind and how they work remain unknown. Using linked equilibrium binding measurements, surface plasmon resonance, and domain truncations in Manduca sexta and bovine sGC, we demonstrate that YC-1 binds near or directly to the heme-containing domain of the β subunit. In the absence of CO, YC-1 binds with a Kd of 9-21 μM, depending on the construct. In the presence of CO, these values decrease to 0.6-1.1 μM. Pfizer compound 25 bound ∼10-fold weaker than YC-1 in the absence of CO, whereas compound BAY 41-2272 bound particularly tightly in the presence of CO (Kd = 30-90 nM). Additionally, we found that CO binds much more weakly to heterodimeric sGC proteins (Kd = 50-100 μM) than to the isolated heme domain (Kd = 0.2 μM for Manduca β H-NOX/PAS). YC-1 greatly enhanced binding of CO to heterodimeric sGC, as expected (Kd ∼ 1 μM). These data indicate the α subunit induces a heme pocket conformation with a lower affinity for CO and NO. YC-1 family compounds bind near the heme domain, overcoming the α subunit effect and inducing a heme pocket conformation with high affinity. We propose this high-affinity conformation is required for the full-length protein to achieve high catalytic activity.
Collapse
Affiliation(s)
- Rahul Purohit
- Department of Chemistry and Biochemistry, The University of Arizona , Tucson, Arizona 85721, United States
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Busker M, Neidhardt I, Behrends S. Nitric oxide activation of guanylate cyclase pushes the α1 signaling helix and the β1 heme-binding domain closer to the substrate-binding site. J Biol Chem 2013; 289:476-84. [PMID: 24220034 DOI: 10.1074/jbc.m113.504472] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The complete structure of the assembled domains of nitric oxide-sensitive guanylate cyclase (NOsGC) remains to be determined. It is also unknown how binding of NO to heme in guanylate cyclase is communicated to the catalytic domain. In the current study the conformational change of guanylate cyclase on activation by NO was studied using FRET. Endogenous tryptophan residues were used as donors, the substrate analog 2'-Mant-3'-dGTP as acceptor. The enzyme contains five tryptophan residues distributed evenly over all four functional domains. This provides a unique opportunity to detect the movement of the functional domains relative to the substrate-binding catalytic region. FRET measurements indicate that NO brings tryptophan 22 in the αB helix of the β1 heme NO binding domain and tryptophan 466 in the second short helix of the α1 coiled-coil domain closer to the catalytic domain. We propose that the respective domains act as a pair of tongs forcing the catalytic domain into the nitric oxide-activated conformation.
Collapse
Affiliation(s)
- Mareike Busker
- From the Department of Pharmacology, Toxicology and Clinical Pharmacy, University of Braunschweig-Institute of Technology, D-38106 Braunschweig, Germany
| | | | | |
Collapse
|
45
|
Purohit R, Weichsel A, Montfort WR. Crystal structure of the Alpha subunit PAS domain from soluble guanylyl cyclase. Protein Sci 2013; 22:1439-44. [PMID: 23934793 DOI: 10.1002/pro.2331] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 03/31/2013] [Accepted: 08/05/2013] [Indexed: 12/26/2022]
Abstract
Soluble guanylate cyclase (sGC) is a heterodimeric heme protein of ≈ 150 kDa and the primary nitric oxide receptor. Binding of NO stimulates cyclase activity, leading to regulation of cardiovascular physiology and providing attractive opportunities for drug discovery. How sGC is stimulated and where candidate drugs bind remains unknown. The α and β sGC chains are each composed of Heme-Nitric Oxide Oxygen (H-NOX), Per-ARNT-Sim (PAS), coiled-coil and cyclase domains. Here, we present the crystal structure of the α1 PAS domain to 1.8 Å resolution. The structure reveals the binding surfaces of importance to heterodimer function, particularly with respect to regulating NO binding to heme in the β1 H-NOX domain. It also reveals a small internal cavity that may serve to bind ligands or participate in signal transduction.
Collapse
Affiliation(s)
- Rahul Purohit
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | | | | |
Collapse
|
46
|
Follmann M, Griebenow N, Hahn MG, Hartung I, Mais FJ, Mittendorf J, Schäfer M, Schirok H, Stasch JP, Stoll F, Straub A. The chemistry and biology of soluble guanylate cyclase stimulators and activators. Angew Chem Int Ed Engl 2013; 52:9442-62. [PMID: 23963798 DOI: 10.1002/anie.201302588] [Citation(s) in RCA: 153] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Indexed: 12/14/2022]
Abstract
The vasodilatory properties of nitric oxide (NO) have been utilized in pharmacotherapy for more than 130 years. Still today, NO-donor drugs are important in the management of cardiovascular diseases. However, inhaled NO or drugs releasing NO and organic nitrates are associated with noteworthy therapeutic shortcomings, including resistance to NO in some disease states, the development of tolerance during long-term treatment, and nonspecific effects, such as post-translational modification of proteins. The beneficial actions of NO are mediated by stimulation of soluble guanylate cyclase (sGC), a heme-containing enzyme which produces the intracellular signaling molecule cyclic guanosine monophosphate (cGMP). Recently, two classes of compounds have been discovered that amplify the function of sGC in a NO-independent manner, the so-called sGC stimulators and sGC activators. The most advanced drug, the sGC stimulator riociguat, has successfully undergone Phase III clinical trials for different forms of pulmonary hypertension.
Collapse
Affiliation(s)
- Markus Follmann
- Bayer Pharma Aktiengesellschaft, Global Drug Discovery, Aprather Weg 18a, 42113 Wuppertal, Germany.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Follmann M, Griebenow N, Hahn MG, Hartung I, Mais FJ, Mittendorf J, Schäfer M, Schirok H, Stasch JP, Stoll F, Straub A. Chemie und Biologie der Stimulatoren und Aktivatoren der löslichen Guanylatcyclase. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302588] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
48
|
Higher-order interactions bridge the nitric oxide receptor and catalytic domains of soluble guanylate cyclase. Proc Natl Acad Sci U S A 2013; 110:6777-82. [PMID: 23572573 DOI: 10.1073/pnas.1301934110] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Nitric oxide (NO) signaling pathways mediate diverse physiological functions, including vasodilation and neurotransmission. Soluble guanylate cyclase (sGC), the primary NO receptor, triggers downstream signaling cascades by producing the second messenger cGMP. NO binds the sGC heme cofactor to stimulate cyclase activity, yet the molecular mechanisms of cyclase activation remain obscure. Although structural models of the individual sGC domains are available, the structure of the full sGC heterodimer is unknown. Understanding the higher-order domain architecture of sGC is a prerequisite to elucidating the mechanisms of NO activation. We used protein footprinting to map interdomain interaction surfaces of the sGC signaling domains. Hydrogen/deuterium exchange mass spectrometry revealed direct interactions between the Per/Arnt/Sim domain and the heme-associated signaling helix of the heme-NO/O2 binding (H-NOX) domain. Furthermore, interfaces between the H-NOX and catalytic domains were mapped using domain truncations and full-length sGC. The H-NOX domain buries surfaces of the α1 catalytic domain proximal to the cyclase active site, suggesting a signaling mechanism involving NO-induced derepression of catalytic activity. Together, our data reveal interdomain interactions responsible for communicating NO occupancy from H-NOX heme to the catalytic domain active site.
Collapse
|
49
|
Allerston CK, von Delft F, Gileadi O. Crystal structures of the catalytic domain of human soluble guanylate cyclase. PLoS One 2013; 8:e57644. [PMID: 23505436 PMCID: PMC3591389 DOI: 10.1371/journal.pone.0057644] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 01/22/2013] [Indexed: 01/05/2023] Open
Abstract
Soluble guanylate cyclase (sGC) catalyses the synthesis of cyclic GMP in response to nitric oxide. The enzyme is a heterodimer of homologous α and β subunits, each of which is composed of multiple domains. We present here crystal structures of a heterodimer of the catalytic domains of the α and β subunits, as well as an inactive homodimer of β subunits. This first structure of a metazoan, heteromeric cyclase provides several observations. First, the structures resemble known structures of adenylate cyclases and other guanylate cyclases in overall fold and in the arrangement of conserved active-site residues, which are contributed by both subunits at the interface. Second, the subunit interaction surface is promiscuous, allowing both homodimeric and heteromeric association; the preference of the full-length enzyme for heterodimer formation must derive from the combined contribution of other interaction interfaces. Third, the heterodimeric structure is in an inactive conformation, but can be superposed onto an active conformation of adenylate cyclase by a structural transition involving a 26° rigid-body rotation of the α subunit. In the modelled active conformation, most active site residues in the subunit interface are precisely aligned with those of adenylate cyclase. Finally, the modelled active conformation also reveals a cavity related to the active site by pseudo-symmetry. The pseudosymmetric site lacks key active site residues, but may bind allosteric regulators in a manner analogous to the binding of forskolin to adenylate cyclase. This indicates the possibility of developing a new class of small-molecule modulators of guanylate cyclase activity targeting the catalytic domain.
Collapse
Affiliation(s)
- Charles K. Allerston
- Structural Genomics Consortium, University of Oxford, Oxford, The United Kingdom
| | - Frank von Delft
- Structural Genomics Consortium, University of Oxford, Oxford, The United Kingdom
| | - Opher Gileadi
- Structural Genomics Consortium, University of Oxford, Oxford, The United Kingdom
- * E-mail:
| |
Collapse
|
50
|
Fritz BG, Roberts SA, Ahmed A, Breci L, Li W, Weichsel A, Brailey JL, Wysocki VH, Tama F, Montfort WR. Molecular model of a soluble guanylyl cyclase fragment determined by small-angle X-ray scattering and chemical cross-linking. Biochemistry 2013; 52:1568-82. [PMID: 23363317 PMCID: PMC3607398 DOI: 10.1021/bi301570m] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Soluble guanylyl/guanylate cyclase (sGC) converts GTP to cGMP after binding nitric oxide, leading to smooth muscle relaxation and vasodilation. Impaired sGC activity is common in cardiovascular disease, and sGC stimulatory compounds are vigorously sought. sGC is a 150 kDa heterodimeric protein with two H-NOX domains (one with heme, one without), two PAS domains, a coiled-coil domain, and two cyclase domains. Binding of NO to the sGC heme leads to proximal histidine release and stimulation of catalytic activity. To begin to understand how binding leads to activation, we examined truncated sGC proteins from Manduca sexta (tobacco hornworm) that bind NO, CO, and stimulatory compound YC-1 but lack the cyclase domains. We determined the overall shape of truncated M. sexta sGC using analytical ultracentrifugation and small-angle X-ray scattering (SAXS), revealing an elongated molecule with dimensions of 115 Å × 90 Å × 75 Å. Binding of NO, CO, or YC-1 had little effect on shape. Using chemical cross-linking and tandem mass spectrometry, we identified 20 intermolecular contacts, allowing us to fit homology models of the individual domains into the SAXS-derived molecular envelope. The resulting model displays a central parallel coiled-coil platform upon which the H-NOX and PAS domains are assembled. The β1 H-NOX and α1 PAS domains are in contact and form the core signaling complex, while the α1 H-NOX domain can be removed without a significant effect on ligand binding or overall shape. Removal of 21 residues from the C-terminus yields a protein with dramatically increased proximal histidine release rates upon NO binding.
Collapse
Affiliation(s)
- Bradley G. Fritz
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Sue A. Roberts
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Aqeel Ahmed
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Linda Breci
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Wenzhou Li
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Andrzej Weichsel
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Jacqueline L. Brailey
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Vicki H. Wysocki
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - Florence Tama
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| | - William R. Montfort
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, 85721
| |
Collapse
|