Abstract
IRE1 belongs to a type I transmembrane protein family harboring two functional domains, cytoplasmic domain with kinase and RNAse catalytic activity, and the luminal domain, which is involved in the sensing of unfolded proteins. IRE1 molecule undergoes dimerization in the lumenal domain, which functionally activates the catalytic C-terminal domain. IRE1 activation is directly related to transition between monomeric and dimeric forms. We have deduced two quaternary structures from the published crystal structure of IRE1. One structure with a large stable interface that requires large activation and deactivation energy to active IRE1. The other quaternary structure has low dissociation energy and is more suitable for IRE1 oligomeric transition.
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