Structural changes at the myrtenol backbone reverse its positive allosteric potential into inhibitory GABAA receptor modulation
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Structural changes at the myrtenol backbone reverse its positive allosteric potential into inhibitory GABAA receptor modulation. / Milanos, Sinem; Kuenzel, Katharina; Gilbert, Daniel F; Janzen, Dieter; Sasi, Manju; Buettner, Andrea; Frimurer, Thomas M.; Villmann, Carmen.
In: Biological Chemistry, Vol. 399, No. 6, 2018, p. 549-563.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Structural changes at the myrtenol backbone reverse its positive allosteric potential into inhibitory GABAA receptor modulation
AU - Milanos, Sinem
AU - Kuenzel, Katharina
AU - Gilbert, Daniel F
AU - Janzen, Dieter
AU - Sasi, Manju
AU - Buettner, Andrea
AU - Frimurer, Thomas M.
AU - Villmann, Carmen
PY - 2018
Y1 - 2018
N2 - GABAA receptors are ligand-gated anion channels that form pentameric arrangements of various subunits. Positive allosteric modulators of GABAA receptors have been reported either isolated from plants or synthesized analogs of known GABAA receptor targeting drugs. Recently, we identified monoterpenes, e.g. myrtenol as positive allosteric modulator at α1β2 GABAA receptors. Here, along with pharmacophore-based virtual screening studies, we demonstrate that scaffold modifications of myrtenol resulted in loss of modulatory activity. Two independent approaches, fluorescence-based compound analysis and electrophysiological recordings in whole-cell configurations were used for analysis of transfected cells. C-atoms 1 and 2 of the myrtenol backbone were identified as crucial to preserve positive allosteric potential. A modification at C-atom 2 and lack of the hydroxyl group at C-atom 1 exhibited significantly reduced GABAergic currents at α1β2, α1β2γ, α2β3, α2β3γ, and α4β3δ receptors. This effect was independent of the γ2 subunit. A sub-screen with side chain length and volume differences at C-atom 1 identified two compounds that inhibited GABAergic responses but without receptor subtype specificity. Our combined approach of pharmacophore-based virtual screening and functional readouts reveals that side chain modifications of the bridged six-membered ring structure of myrtenol are crucial for its modulatory potential at GABAA receptors.
AB - GABAA receptors are ligand-gated anion channels that form pentameric arrangements of various subunits. Positive allosteric modulators of GABAA receptors have been reported either isolated from plants or synthesized analogs of known GABAA receptor targeting drugs. Recently, we identified monoterpenes, e.g. myrtenol as positive allosteric modulator at α1β2 GABAA receptors. Here, along with pharmacophore-based virtual screening studies, we demonstrate that scaffold modifications of myrtenol resulted in loss of modulatory activity. Two independent approaches, fluorescence-based compound analysis and electrophysiological recordings in whole-cell configurations were used for analysis of transfected cells. C-atoms 1 and 2 of the myrtenol backbone were identified as crucial to preserve positive allosteric potential. A modification at C-atom 2 and lack of the hydroxyl group at C-atom 1 exhibited significantly reduced GABAergic currents at α1β2, α1β2γ, α2β3, α2β3γ, and α4β3δ receptors. This effect was independent of the γ2 subunit. A sub-screen with side chain length and volume differences at C-atom 1 identified two compounds that inhibited GABAergic responses but without receptor subtype specificity. Our combined approach of pharmacophore-based virtual screening and functional readouts reveals that side chain modifications of the bridged six-membered ring structure of myrtenol are crucial for its modulatory potential at GABAA receptors.
KW - Journal Article
KW - virtual screening
KW - patch clamp recording
KW - myrtenol
KW - YFPI152L
KW - GABA receptor
KW - allosteric modulation
KW - GABA(A) receptor
U2 - 10.1515/hsz-2017-0262
DO - 10.1515/hsz-2017-0262
M3 - Journal article
C2 - 29408795
VL - 399
SP - 549
EP - 563
JO - Biological Chemistry Hoppe-Seyler
JF - Biological Chemistry Hoppe-Seyler
SN - 1431-6730
IS - 6
ER -
ID: 189765286