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Structural basis for regulation of beta2 adrenergic receptor signaling by the dynamic post-translational modification S-palmitoylation

Award Number: F31HL164002
ORGANIZATION: NATIONAL HEART, LUNG, & BLOOD INSTITUTE
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: FELLOWSHIP/SCHOLARSHIP/STUDENT LOANS

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PROJECT SUMMARY/ABSTRACT Heart failure is a leading cause of morbidity and mortality in western countries and represents the final common clinical event of numerous cardiovascular diseases. Cardiac ß2 adrenergic signaling determines cardiac output and has been extensively studied as treatments directed toward ß2 adrenergic signaling have proven effective at improving cardiac performance and heart failure outcomes. The ß2 adrenergic receptor (ß2AR) is a G-protein- coupled receptor (GPCR), a family of membrane proteins representing the largest and most versatile group of cell surface receptors. They are ubiquitous membrane proteins that facilitate the initial role in the transduction of information into the cell via a wide array of extracellular signal-receptor interactions. Although much progress has been made in elucidating conformational insights into ligand-mediated signaling of GPCRs, there has not been commensurate investigation into endogenous modulators of GPCR signaling. Endogenous modulators include but are not limited to protein-lipid interactions, post-translational modifications, and accessory protein interactions. The ß2AR has a site for S-palmitoylation, the covalent attachment of palmitate to a cysteine, in the C-terminal helix 8 (H8). Interestingly, H8 of the ß2AR is implicated in ß-arrestin recruitment, resulting in a non- canonical signaling pathway, yet little is known of the effect that palmitoylation of H8 has on intracellular signaling and structural dynamics of the receptor. I hypothesize that S-palmitoylation of the ß2AR has an allosteric effect on the conformational plasticity therein modulating functional transducer coupling in the context of ligand mediated protein activation. The goal of this project is to determine the effect S-palmitoylation has on ß2AR signaling in the following two specific aims. Aim 1. To define the impact of s-palmitoylation on the conformational dynamics at the cytoplasmic surface of the ß2AR and the effect it has on the interaction with transducers to facilitate intracellular signaling using both electron paramagnetic resonance (EPR) techniques and signaling assays. In preliminary experiments, we performed site-directed spin-labeling to generate a set of nitroxide spin labeled receptor mutants to perform EPR spectroscopy experiments. Aim 2. To determine the impact of S-palmitoylation on H8 and tail dynamics of the ß2AR using EPR techniques. These experiments will help us better understand ß2AR signaling as a whole and provide new insight into novel ways of GPCR signaling regulation via endogenous modulators. Further, the experiments will provide new insight into the effects of S- palmitoylation on the conformational plasticity and, ultimately, the signaling of the ß2AR. These results will provide a greater clarity on ß2AR signaling and regulation within the context of a physiologically relevant cellular environment, which will help with the design of effective treatments targeting cardiac ß2 adrenergic signaling.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2024 ( Subtotal = $47,694 )
2024	2024	THE MEDICAL COLLEGE OF WISCONSIN, INC.	8701 WATERTOWN PLANK RD	MILWAUKEE	WI	53226	MILWAUKEE	USA	Cardiovascular Diseases Research	000	2	2/3/2024	NON-COMPETING CONTINUATION	$47,694
														Subtotal = $47,694

Issue Date FY: 2023 ( Subtotal = $47,694 )
2023	2023	THE MEDICAL COLLEGE OF WISCONSIN, INC.	8701 WATERTOWN PLANK RD	MILWAUKEE	WI	53226	MILWAUKEE	USA	Cardiovascular Diseases Research	002	1	4/14/2023	NEW	$942
2023	2023	THE MEDICAL COLLEGE OF WISCONSIN, INC.	8701 WATERTOWN PLANK RD	MILWAUKEE	WI	53226	MILWAUKEE	USA	Cardiovascular Diseases Research	001	1	1/3/2023	NEW	$0
2023	2023	MEDICAL COLLEGE OF WISCONSIN, INC., THE	8701 WATERTOWN PLANK RD	MILWAUKEE	WI	53226	MILWAUKEE	USA	Cardiovascular Diseases Research	000	1	1/3/2023	NEW	$46,752
														Subtotal = $47,694

Grand Total All Awards = $95,388

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Structural basis for regulation of beta2 adrenergic receptor signaling by the dynamic post-translational modification S-palmitoylation

Award Number: F31HL164002

ORGANIZATION: NATIONAL HEART, LUNG, & BLOOD INSTITUTE

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: FELLOWSHIP/SCHOLARSHIP/STUDENT LOANS

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