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245	1	0	_aAbscisic Acid Stimulates a Calcium-Dependent Protein Kinase in Grape Berry
490	0		_vPlant Physiology, 140, p.558-579, 2006
520	3		_aIt has been demonstrated that calcium plays a central role in mediating abscisic acid (ABA)signaling, but many of the Ca21-binding sensory proteins as the components of the ABA-signaling pathway remain to be elucidated. Here we identified, characterized, and purified a 58-kD ABA-stimulated calcium-dependent protein kinase from the mesocarp of grape berries (Vitis vinifera3Vitis labrusca), designated ACPK1 (for ABA-stimulated calcium-dependent protein kinase1). ABA stimulates ACPK1 in a dose-dependent manner, and the ACPK1 expression and enzyme activities alter accordantly with the endogenous ABA concentrations during fruit development. The ABA-induced ACPK1 stimulation appears to be transient with a rapid effect in 15 min but also with a slow and steady state of induction after 60 min. ABA acts on ACPK1 indirectly and dependently on in vivo state of the tissues. Two inactive ABA isomers, (2)-2-cis, 4-trans-ABA and 2-trans, 4-trans-(6)-ABA, are ineffective for inducing ACPK1 stimulation, revealing that the ABA-induced effect is stereo specific to physiological active (1)-2-cis, 4-trans-ABA. The other phytohormones such as auxin indoleacetic acid, gibberellic acid, synthetic cytokinin N-benzyl-6- aminopurine, and brassinolide are also ineffective in this ACPK1 stimulation. Based on sequencing of the two-dimensional electrophoresis-purified ACPK1, we cloned the ACPK1 gene. The ACPK1 is expressed specifically in grape berry covering a fleshy portion and seeds, and in a developmental stage-dependent manner.We further showed that ACPK1 is localized in both plasma membranes and chloroplasts/plastids and positively regulates plasma membrane H1-ATPase in vitro, suggesting that ACPK1 may be involved in the ABA-signaling pathway.
700	1	2	_aYu, X.C.
700	1	2	_aLi, M.J.
700	1	2	_aGao, J.F.
700	1	2	_aFeng, H.Z.
700	1	2	_aGeng, X.Q.
700	1	2	_aPeng, C.C.
700	1	2	_aZhu, S.Y.
700	1	2	_aZhu, S.Y.
700	1	2	_aShen, Y.Y.
700	1	2	_aZhang, D.P.
856	4	0	_uhttps://drive.google.com/file/d/1fx4aAUkJdpw60aXkdfWFmyq-a0cuW_9v/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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