Differential regulation by ATP versus ADP further links CaMKII aggregation to ischemic conditions.
Differential regulation by ATP versus ADP further links CaMKII aggregation to ischemic conditions.
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DOI:
10.1016/j.febslet.2009.10.028
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发表时间:
2009-11-19
期刊:
影响因子:
3.5
通讯作者:
Bayer, K. Ulrich
中科院分区:
文献类型:
--
作者:
Vest, Rebekah S.;O'Leary, Heather;Bayer, K. Ulrich
CaMKII, a major mediator of synaptic plasticity, forms extra-synaptic clusters under ischemic conditions. This study further supports self-aggregation of CaMKII holoenzymes as the underlying mechanism. Aggregation in vitro was promoted by mimicking ischemic conditions: low pH (6.8 or less), Ca2+ (and calmodulin), and low ATP and/or high ADP concentration. Mutational analysis showed that high ATP prevented aggregation by a mechanism involving T286 auto-phosphorylation, and indicated requirement for nucleotide binding but not auto-phosphorylation also for extra-synaptic clustering within neurons. These results clarify a previously apparent paradox in the nucleotide and phosphorylation requirement of aggregation, and support a mechanism that involves inter-holoenzyme T286-region/T-site interaction.
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