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The amino terminus of cGMP-dependent protein kinase I? increases the dynamics of the protein's cGMP-binding pockets.


ABSTRACT: The type I cGMP-dependent protein kinases play critical roles in regulating vascular tone, platelet activation and synaptic plasticity. PKG I ? and PKG I? differ in their first ~100 amino acids giving each isoform unique dimerization and autoinhibitory domains with identical cGMP-binding pockets and catalytic domains. The N-terminal leucine zipper and autoinhibitory domains have been shown to mediate isoform specific affinity for cGMP. PKG I? has a >10 fold higher affinity for cGMP than PKG I?, and PKG I? that is missing its leucine zipper has a three-fold decreased affinity for cGMP. The exact mechanism through which the N-terminus of PKG alters cGMP-affinity is unknown. In the present study, we have used deuterium exchange mass spectrometry to study how PKG I?'s N-terminus affects the conformation and dynamics of its cGMP-binding pockets. We found that the N-terminus increases the rate of deuterium exchange throughout the cGMP-binding domain. Our results suggest that the N-terminus shifts the conformational dynamics of the binding pockets, leading to an "open" conformation that has an increased affinity for cGMP.

SUBMITTER: Lee JH 

PROVIDER: S-EPMC3107041 | BioStudies | 2011-01-01

REPOSITORIES: biostudies

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