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-Structure paper
Title | Single-particle EM reveals the higher-order domain architecture of soluble guanylate cyclase. |
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Journal, issue, pages | Proc Natl Acad Sci U S A, Vol. 111, Issue 8, Page 2960-2965, Year 2014 |
Publish date | Feb 25, 2014 |
Authors | Melody G Campbell / Eric S Underbakke / Clinton S Potter / Bridget Carragher / Michael A Marletta / |
PubMed Abstract | Soluble guanylate cyclase (sGC) is the primary nitric oxide (NO) receptor in mammals and a central component of the NO-signaling pathway. The NO-signaling pathways mediate diverse physiological ...Soluble guanylate cyclase (sGC) is the primary nitric oxide (NO) receptor in mammals and a central component of the NO-signaling pathway. The NO-signaling pathways mediate diverse physiological processes, including vasodilation, neurotransmission, and myocardial functions. sGC is a heterodimer assembled from two homologous subunits, each comprised of four domains. Although crystal structures of isolated domains have been reported, no structure is available for full-length sGC. We used single-particle electron microscopy to obtain the structure of the complete sGC heterodimer and determine its higher-order domain architecture. Overall, the protein is formed of two rigid modules: the catalytic dimer and the clustered Per/Art/Sim and heme-NO/O2-binding domains, connected by a parallel coiled coil at two hinge points. The quaternary assembly demonstrates a very high degree of flexibility. We captured hundreds of individual conformational snapshots of free sGC, NO-bound sGC, and guanosine-5'-[(α,β)-methylene]triphosphate-bound sGC. The molecular architecture and pronounced flexibility observed provides a significant step forward in understanding the mechanism of NO signaling. |
External links | Proc Natl Acad Sci U S A / PubMed:24516165 / PubMed Central |
Methods | EM (single particle) |
Resolution | 30.0 Å |
Structure data | EMDB-5861: EMDB-5862: EMDB-5863: EMDB-5864: EMDB-5865: EMDB-5866: EMDB-5867: EMDB-5868: EMDB-5869: EMDB-5870: EMDB-5871: EMDB-5872: EMDB-5873: EMDB-5874: EMDB-5875: EMDB-5876: EMDB-5877: EMDB-5878: EMDB-5879: EMDB-5880: EMDB-5881: EMDB-5882: EMDB-5883: EMDB-5884: |
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