Download MendeleyStructures of cGMP-Dependent Protein Kinase (PKG) I alpha Leucine Zippers Reveal an Interchain Disulfide Bond Important for Dimer Stability.
Qin, L., Reger, A.S., Guo, E., Yang, M.P., Zwart, P., Casteel, D.E., Kim, C.(2015) Biochemistry 54: 4419-4422
- PubMed: 26132214
- DOI: https://doi.org/10.1021/acs.biochem.5b00572
- Primary Citation of Related Structures:
4R4L, 4R4M - PubMed Abstract:
cGMP-dependent protein kinase (PKG) Iα is a central regulator of smooth muscle tone and vasorelaxation. The N-terminal leucine zipper (LZ) domain dimerizes and targets PKG Iα by interacting with G-kinase-anchoring proteins. The PKG Iα LZ contains C42 that is known to form a disulfide bond upon oxidation and to activate PKG Iα. To understand the molecular details of the PKG Iα LZ and C42-C42' disulfide bond, we determined crystal structures of the PKG Iα wild-type (WT) LZ and C42L LZ. Our data demonstrate that the C42-C42' disulfide bond dramatically stabilizes PKG Iα and that the C42L mutant mimics the oxidized WT LZ structurally.
Organizational Affiliation:
⊥Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
