Heterogeneity in human hippocampal CaMKII transcripts reveals allosteric hub-dependent regulation.

Science Signaling
Roman SloutskyMargaret M Stratton

Abstract

Calcium/calmodulin-dependent protein kinase II (CaMKII) plays a central role in Ca2+ signaling throughout the body. In the hippocampus, CaMKII is required for learning and memory. Vertebrate genomes encode four CaMKII homologs: CaMKIIα, CaMKIIβ, CaMKIIγ, and CaMKIIδ. All CaMKIIs consist of a kinase domain, a regulatory segment, a variable linker region, and a hub domain, which is responsible for oligomerization. The four proteins differ primarily in linker length and composition because of extensive alternative splicing. Here, we report the heterogeneity of CaMKII transcripts in three complex samples of human hippocampus using deep sequencing. We showed that hippocampal cells contain a diverse collection of over 70 CaMKII transcripts from all four CaMKII-encoding genes. We characterized the Ca2+/CaM sensitivity of hippocampal CaMKII variants spanning a broad range of linker lengths and compositions. The effect of the variable linker on Ca2+/CaM sensitivity depended on the kinase and hub domains. Moreover, we revealed a previously uncharacterized role for the hub domain as an allosteric regulator of kinase activity, which may provide a pharmacological target for modulating CaMKII activity. Using small-angle x-ray scattering and ...Continue Reading

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Citations

Aug 21, 2020·Proceedings of the National Academy of Sciences of the United States of America·Mateusz Dyla, Magnus Kjaergaard
Mar 29, 2021·Brain Research Bulletin·Martina Proietti Onori, Geeske M van Woerden
Aug 1, 2021·Proceedings of the National Academy of Sciences of the United States of America·Ulrike LeursPetrine Wellendorph

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