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Mechanisms of HIV fitness and drug resistance inferred from high-resolution molecular dynamics and sequence co-variation models

Award Number: R01AI178849
ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 08/01/2023
PERIOD OF PERFORMANCE END DATE: 07/31/2028

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Mechanisms of HIV fitness and drug resistance inferred from high-resolution molecular dynamics and sequence co-variation models - ABSTRACT There are ~40 million people world-wide infected by the Human Immunodeficiency Virus Type 1 (HIV-1, commonly referred to as HIV). As currently there is no cure, antiretroviral treatment is the primary treatment option. Yet antiretroviral treatment eventually fails over time due to the development of drug resistance. We will develop new computational tools for forecasting HIV evolutionary trajectories under therapeutic selection pressure leading to drug resistance, using high resolution all atom molecular dynamics simulations together with physics-based machine learning models of sequence co-variation. The computational studies will be complemented by structural, biophysical, and virological studies on two HIV protein multimeric targets: HIV integrase (IN), and capsid (CA). The modeling and experiments will be employed in an iterative manner, with the experimental results being used to validate, parameterize and improve the models; and the molecular dynamics simulations used to guide new experiments and also to develop new tools for high resolution cryo-EM refinement of multiple binding modes of HIV inhibitors and interfacial solvent. The common theme of our proposed work is to provide structural interpretations for the observed fitness and resistance effects of mutations, with the goal of developing holistic structure-function models which can be used to predict viral mutation trajectories under drug selection pressure and give a mechanistic explanation for them. There are three specific aims: (1) determine the physical mechanisms underlying mutational epistasis under varied drug environments, and use MD simulations and virological data to parameterize drug specific landscapes for HIV IN and CA under a novel theoretical framework; (2) use high resolution, large scale alchemical molecular dynamics free energy simulations based on advanced sampling methods to analyze the effects of protein mutations on the stability of protein-protein interfaces that constitute the intasome and the capsid particle assemblies; (3) determine the molecular basis for multiple binding modes of inhibitors of HIV IN, and the role of solvation in the strong binding of these inhibitors. These aims seek to achieve a molecular understanding of the cooperative effects (epistasis) of multi-residue mutation patterns on the binding of inhibitors to their viral protein targets (IN, CA) and their effects on the stability of the multimers (intasome and capsid particle). We anticipate that this work will lead to the development of surveillance tools to forecast the response of viral systems to the selection pressure of antiviral therapeutics.


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: 2025 ( Subtotal = $661,831 )
2025	2025	TEMPLE UNIVERSITY-OF THE COMMONWEALTH SYSTEM OF HIGHER EDUCATION	1805 N BROAD ST	PHILADELPHIA	PA	19122	PHILADELPHIA	USA	Allergy and Infectious Diseases Research	000	3	7/15/2025	NON-COMPETING CONTINUATION	$661,831
														Subtotal = $661,831

Issue Date FY: 2024 ( Subtotal = $661,831 )
2024	2024	TEMPLE UNIVERSITY-OF THE COMMONWEALTH SYSTEM OF HIGHER EDUCATION	1805 N BROAD ST	PHILADELPHIA	PA	19122	PHILADELPHIA	USA	Allergy and Infectious Diseases Research	000	2	7/10/2024	NON-COMPETING CONTINUATION	$661,831
														Subtotal = $661,831

Issue Date FY: 2023 ( Subtotal = $691,081 )
2023	2023	TEMPLE UNIVERSITY-OF THE COMMONWEALTH SYSTEM OF HIGHER EDUCATION	1801 N BROAD ST	PHILADELPHIA	PA	19122	PHILADELPHIA	USA	Allergy and Infectious Diseases Research	000	1	7/26/2023	NEW	$691,081
														Subtotal = $691,081

Grand Total All Awards = $2,014,743

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Mechanisms of HIV fitness and drug resistance inferred from high-resolution molecular dynamics and sequence co-variation models

Award Number: R01AI178849

ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

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

PERIOD OF PERFORMANCE START DATE: 08/01/2023

PERIOD OF PERFORMANCE END DATE: 07/31/2028

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