Janette B Myers / Vincent Zaegel / Steven J Coultrap / Adam P Miller / K Ulrich Bayer / Steve L Reichow /
PubMed Abstract
The Ca/calmodulin-dependent protein kinase II (CaMKII) assembles into large 12-meric holoenzymes, which is thought to enable regulatory processes required for synaptic plasticity underlying learning, ...The Ca/calmodulin-dependent protein kinase II (CaMKII) assembles into large 12-meric holoenzymes, which is thought to enable regulatory processes required for synaptic plasticity underlying learning, memory and cognition. Here we used single particle electron microscopy (EM) to determine a pseudoatomic model of the CaMKIIα holoenzyme in an extended and activation-competent conformation. The holoenzyme is organized by a rigid central hub complex, while positioning of the kinase domains is highly flexible, revealing dynamic holoenzymes ranging from 15-35 nm in diameter. While most kinase domains are ordered independently, ∼20% appear to form dimers and <3% are consistent with a compact conformation. An additional level of plasticity is revealed by a small fraction of bona-fide 14-mers (<4%) that may enable subunit exchange. Biochemical and cellular FRET studies confirm that the extended state of CaMKIIα resolved by EM is the predominant form of the holoenzyme, even under molecular crowding conditions.
EMDB-8514:3D reconstruction of the CaMKIIa holoenzyme. PDB-5u6y:Pseudo-atomic model of the CaMKIIa holoenzyme. Method: EM (single particle) / Resolution: 20.0 Å
Oct 5, 2021. Nobel Prize for mechanically activated and temperature-gated ion channels
Nobel Prize for mechanically activated and temperature-gated ion channels
The Nobel Prize in Physiology or Medicine 2021 was awarded jointly to David Julius and Ardem Patapoutian "for their discoveries of receptors for temperature and touch."
EM Navigator can help to find cryo-EM structure data by both pioneers.
In the structure databanks used in Yorodumi, some data are registered as the other names, "COVID-19 virus" and "2019-nCoV". Here are the details of the virus and the list of structure data.
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TRANSFERASE / Calcium/calmodulin-dependent kinase II (CaMKII) / 
