Is disrupted nucleotide-substrate cooperativity a common trait for Cushing's syndrome driving mutations of protein kinase A?

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Is disrupted nucleotide-substrate cooperativity a common trait for Cushing's syndrome driving mutations of protein kinase A? / Walker, Caitlin; Wang, Yingjie; Olivieri, Cristina; V.S, Manu; Gao, Jiali; Bernlohr, David A.; Calebiro, Davide; Taylor, Susan S.; Veglia, Gianluigi.

In: Journal of Molecular Biology, Vol. 433, No. 18, 167123, 03.09.2021.

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Walker, Caitlin ; Wang, Yingjie ; Olivieri, Cristina ; V.S, Manu ; Gao, Jiali ; Bernlohr, David A. ; Calebiro, Davide ; Taylor, Susan S. ; Veglia, Gianluigi. / Is disrupted nucleotide-substrate cooperativity a common trait for Cushing's syndrome driving mutations of protein kinase A?. In: Journal of Molecular Biology. 2021 ; Vol. 433, No. 18.

Bibtex

@article{a96c9dbed00347c685716a7b9fd0b5cc,
title = "Is disrupted nucleotide-substrate cooperativity a common trait for Cushing's syndrome driving mutations of protein kinase A?",
abstract = "Somatic mutations in the PRKACA gene encoding the catalytic α subunit of protein kinase A (PKA-C) are responsible for cortisol-producing adrenocortical adenomas. These benign neoplasms contribute to the development of Cushing's syndrome. The majority of these mutations occur at the interface between the two lobes of PKA-C and interfere with the enzyme's ability to recognize substrates and regulatory (R) subunits, leading to aberrant phosphorylation patterns and activation. Rarely, patients with similar phenotypes carry an allosteric mutation, E31V, located at the C-terminal end of the αA-helix and adjacent to the αC-helix, but structurally distinct from the PKA-C/R subunit interface mutations. Using a combination of solution NMR, thermodynamics, kinetic assays, and molecular dynamics simulations, we show that the E31V allosteric mutation disrupts central communication nodes between the N- and C- lobes of the enzyme as well as nucleotide-substrate binding cooperativity, a hallmark for kinases' substrate fidelity and regulation. For both orthosteric (L205R and W196R) and allosteric (E31V) Cushing{\textquoteright}s syndrome mutants, the loss of binding cooperativity is proportional to the density of the intramolecular allosteric network. This structure–activity relationship suggests a possible common mechanism for Cushing's syndrome driving mutations in which decreased nucleotide/substrate binding cooperativity is linked to loss in substrate fidelity and dysfunctional regulation.",
keywords = "cAMP-dependent protein kinase A, Cushing's syndrome, allostery, binding cooperativity",
author = "Caitlin Walker and Yingjie Wang and Cristina Olivieri and Manu V.S and Jiali Gao and Bernlohr, {David A.} and Davide Calebiro and Taylor, {Susan S.} and Gianluigi Veglia",
year = "2021",
month = sep,
day = "3",
language = "English",
volume = "433",
journal = "Journal of Molecular Biology",
issn = "0022-2836",
publisher = "Elsevier",
number = "18",

}

RIS

TY - JOUR

T1 - Is disrupted nucleotide-substrate cooperativity a common trait for Cushing's syndrome driving mutations of protein kinase A?

AU - Walker, Caitlin

AU - Wang, Yingjie

AU - Olivieri, Cristina

AU - V.S, Manu

AU - Gao, Jiali

AU - Bernlohr, David A.

AU - Calebiro, Davide

AU - Taylor, Susan S.

AU - Veglia, Gianluigi

PY - 2021/9/3

Y1 - 2021/9/3

N2 - Somatic mutations in the PRKACA gene encoding the catalytic α subunit of protein kinase A (PKA-C) are responsible for cortisol-producing adrenocortical adenomas. These benign neoplasms contribute to the development of Cushing's syndrome. The majority of these mutations occur at the interface between the two lobes of PKA-C and interfere with the enzyme's ability to recognize substrates and regulatory (R) subunits, leading to aberrant phosphorylation patterns and activation. Rarely, patients with similar phenotypes carry an allosteric mutation, E31V, located at the C-terminal end of the αA-helix and adjacent to the αC-helix, but structurally distinct from the PKA-C/R subunit interface mutations. Using a combination of solution NMR, thermodynamics, kinetic assays, and molecular dynamics simulations, we show that the E31V allosteric mutation disrupts central communication nodes between the N- and C- lobes of the enzyme as well as nucleotide-substrate binding cooperativity, a hallmark for kinases' substrate fidelity and regulation. For both orthosteric (L205R and W196R) and allosteric (E31V) Cushing’s syndrome mutants, the loss of binding cooperativity is proportional to the density of the intramolecular allosteric network. This structure–activity relationship suggests a possible common mechanism for Cushing's syndrome driving mutations in which decreased nucleotide/substrate binding cooperativity is linked to loss in substrate fidelity and dysfunctional regulation.

AB - Somatic mutations in the PRKACA gene encoding the catalytic α subunit of protein kinase A (PKA-C) are responsible for cortisol-producing adrenocortical adenomas. These benign neoplasms contribute to the development of Cushing's syndrome. The majority of these mutations occur at the interface between the two lobes of PKA-C and interfere with the enzyme's ability to recognize substrates and regulatory (R) subunits, leading to aberrant phosphorylation patterns and activation. Rarely, patients with similar phenotypes carry an allosteric mutation, E31V, located at the C-terminal end of the αA-helix and adjacent to the αC-helix, but structurally distinct from the PKA-C/R subunit interface mutations. Using a combination of solution NMR, thermodynamics, kinetic assays, and molecular dynamics simulations, we show that the E31V allosteric mutation disrupts central communication nodes between the N- and C- lobes of the enzyme as well as nucleotide-substrate binding cooperativity, a hallmark for kinases' substrate fidelity and regulation. For both orthosteric (L205R and W196R) and allosteric (E31V) Cushing’s syndrome mutants, the loss of binding cooperativity is proportional to the density of the intramolecular allosteric network. This structure–activity relationship suggests a possible common mechanism for Cushing's syndrome driving mutations in which decreased nucleotide/substrate binding cooperativity is linked to loss in substrate fidelity and dysfunctional regulation.

KW - cAMP-dependent protein kinase A

KW - Cushing's syndrome

KW - allostery

KW - binding cooperativity

UR - http://www.journals.elsevier.com/journal-of-molecular-biology/

M3 - Article

VL - 433

JO - Journal of Molecular Biology

JF - Journal of Molecular Biology

SN - 0022-2836

IS - 18

M1 - 167123

ER -