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The SH3-HOOK-GUK domains of the postsynaptic scaffolding proteins SAP90/PSD-95 and SAP97 are established targets of synaptic plasticity processes in the brain. A crucial molecular mechanism involved is the transition of this domain to different conformational states. We purified the SH3-HOOK-GUK domain of both proteins to examine variations in protein conformation and stability. As monitored by circular...
Activation of tissue transglutaminase by calcium involves a conformational change which allows exposition of the active site to the substrate via movements of domains 3 and 4 that lead to an increase of the inter-domain distance. The inhibitor GTP counteracts these changes. Here we investigate the possible existence of non-native conformational states still compatible with the enzyme activity produced...
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