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Self-regulation of Lipases by Changes to Quaternary Structure

Award Number: R00GM146024
ORGANIZATION: NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 09/15/2022
PERIOD OF PERFORMANCE END DATE: 04/30/2027

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Self-regulation of Lipases by Changes to Quaternary Structure - Abstract Lipases are a key regulator of metabolic equilibrium in the human body. Examples of conditions in which lipases are dysregulated include pancreatitis, metabolic syndrome, and lipid storages diseases. One of the hallmarks of pancreatitis is the secretion of digestive enzymes, such as pancreatic triacylglycerol lipase (PTL), into the capillaries, rather than the digestive tract, which damages pancreatic cells. Thus, there is a clear need for precise spatiotemporal regulation of lipase activity in the body. In recent work, we found that lipoprotein lipase (LPL) adopts an inactive helical oligomer for storage in adipocyte vesicles prior to secretion. Lipases, like LPL, have a special need for mechanisms of self-regulation, as many possess phospholipase activity, making it difficult to store them in phospholipid-based vesicles. It is likely that other lipases beyond LPL self-regulate by quaternary structure formation to protect the delicate balance of metabolism in the body. In Aim 1, I will elucidate the in situ structure of inactive oligomers of LPL. I will train to use cryo-electron tomography (cryoET) to study LPL structure inside of vesicles. I will also develop a conformation-specific nanobody to discriminate between helical LPL and monomer LPL for use with immunofluorescence microscopy. I will launch my independent R00 research phase by investigating PTL in Aim 2. Preliminary data suggests that PTL forms filaments inside of vesicles and I will screen PTL in vitro for the ability to form inactive self-regulated oligomers and solve their structure using cryo-electron microscopy (cryoEM). I will then apply the pipeline of cryoET and nanobodies developed for studying LPL in vivo, to look at PTL. Finally in Aim 3, I will use pancreatic acinar cells to examine the secretome of the pancreas with and without an acute pancreatitis phenotype. I will look specifically for enzymes stored in inactive quaternary structures and characterize the role played by heparan-sulfate proteoglycans (HSPGs) in secretion. HSPGs have been shown to stabilize LPL filaments and are top candidates for targeting self-regulated filaments into secretory granules. This research will provide crucial information about the structure of lipases in vesicles during cellular trafficking and identify innovative ways to address dysregulation of enzyme secretion associated with pancreatitis. The skills I acquire using cryoET, developing nanobodies, performing immunofluorescence microscopy, and learning about the pancreas will be essential for setting up my success as an independent researcher. They will allow me to pursue pioneering studies of in situ lipase quaternary structure and uncover mechanisms to prevent dysregulation of enzyme secretion during pancreatitis.


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: 2026 ( Subtotal = $249,000 )
2026	2026	THE RESEARCH FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK	W5510 FRANKS MELVILLE MEMORIAL LIBRARY	STONY BROOK	NY	11794	SUFFOLK	USA	Biomedical Research and Research Training	000	5	4/22/2026	NON-COMPETING CONTINUATION	$249,000
														Subtotal = $249,000

Issue Date FY: 2025 ( Subtotal = $249,000 )
2025	2025	THE RESEARCH FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK	W5510 FRANKS MELVILLE MEMORIAL LIBRARY	STONY BROOK	NY	11794	SUFFOLK	USA	Biomedical Research and Research Training	000	4	4/29/2025	NON-COMPETING CONTINUATION	$249,000
														Subtotal = $249,000

Issue Date FY: 2024 ( Subtotal = $261,644 )
2024	2024	THE RESEARCH FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK	W5510 FRANKS MELVILLE MEMORIAL LIBRARY	STONY BROOK	NY	11794	SUFFOLK	USA	Biomedical Research and Research Training	000	3	5/13/2024	EXTENSION WITH OR WITHOUT FUNDS	$249,000
2024	2024	THE RESEARCH FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK	W5510 FRANKS MELVILLE MEMORIAL LIBRARY	STONY BROOK	NY	11794	SUFFOLK	USA	Biomedical Research and Research Training	001	3	8/13/2024	EXTENSION WITH OR WITHOUT FUNDS	$12,644
														Subtotal = $261,644

Grand Total All Awards = $759,644

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Self-regulation of Lipases by Changes to Quaternary Structure

Award Number: R00GM146024

ORGANIZATION: NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 09/15/2022

PERIOD OF PERFORMANCE END DATE: 04/30/2027

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