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J Biol Chem
2011 Mar 25;28612:10618-27. doi: 10.1074/jbc.M110.189100.
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NMR structure and action on nicotinic acetylcholine receptors of water-soluble domain of human LYNX1.
Lyukmanova EN
,
Shenkarev ZO
,
Shulepko MA
,
Mineev KS
,
D'Hoedt D
,
Kasheverov IE
,
Filkin SY
,
Krivolapova AP
,
Janickova H
,
Dolezal V
,
Dolgikh DA
,
Arseniev AS
,
Bertrand D
,
Tsetlin VI
,
Kirpichnikov MP
.
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Discovery of proteins expressed in the central nervous system sharing the three-finger structure with snake α-neurotoxins provoked much interest to their role in brain functions. Prototoxin LYNX1, having homology both to Ly6 proteins and three-finger neurotoxins, is the first identified member of this family membrane-tethered by a GPI anchor, which considerably complicates in vitro studies. We report for the first time the NMR spatial structure for the water-soluble domain of human LYNX1 lacking a GPI anchor (ws-LYNX1) and its concentration-dependent activity on nicotinic acetylcholine receptors (nAChRs). At 5-30 μM, ws-LYNX1 competed with (125)I-α-bungarotoxin for binding to the acetylcholine-binding proteins (AChBPs) and to Torpedo nAChR. Exposure of Xenopus oocytes expressing α7 nAChRs to 1 μM ws-LYNX1 enhanced the response to acetylcholine, but no effect was detected on α4β2 and α3β2 nAChRs. Increasing ws-LYNX1 concentration to 10 μM caused a modest inhibition of these three nAChR subtypes. A common feature for ws-LYNX1 and LYNX1 is a decrease of nAChR sensitivity to high concentrations of acetylcholine. NMR and functional analysis both demonstrate that ws-LYNX1 is an appropriate model to shed light on the mechanism of LYNX1 action. Computer modeling, based on ws-LYNX1 NMR structure and AChBP x-ray structure, revealed a possible mode of ws-LYNX1 binding.
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