5flz

Cryo-EM structure of gamma-TuSC oligomers in a closed conformation

Loading... Status: waiting for Mol* initialization Structural highlights 5flz is a 6 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 6.9Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SPC97_YEAST Involved in microtubule organization by the microtubule organizing center, the spindle pole body (SPB). Probably part of the microtubule attachment site at the SPB. Publication Abstract from PubMed Modeling protein complex structures based on distantly related homologues can be challenging due to poor sequence and structure conservation. Therefore, utilizing even low-resolution experimental data can significantly increase model precision and accuracy. Here, we present models of the two key functional states of the yeast gamma-tubulin small complex (gammaTuSC): one for the low-activity "open" state and another for the higher-activity "closed" state. Both models were computed based on remotely related template structures and cryo-EM density maps at 6.9A and 8.0A resolution, respectively. For each state, extensive sampling of alignments and conformations was guided by the fit to the corresponding cryo-EM density map. The resulting good-scoring models formed a tightly clustered ensemble of conformations in most regions. We found significant structural differences between the two states, primarily in the gamma-tubulin subunit regions where the microtubule binds. We also report a set of chemical cross-links that were found to be consistent with equilibrium between the open and closed states. The protocols developed here have been incorporated into our open-source Integrative Modeling Platform (IMP) software package (https://integrativemodeling.org), and can therefore be applied to many other systems. Structure of gamma-tubulin small complex based on a cryo-EM map, chemical cross-links, and a remotely related structure.,Greenberg CH, Kollman J, Zelter A, Johnson R, MacCoss MJ, Davis TN, Agard DA, Sali A J Struct Biol. 2016 Jun;194(3):303-10. doi: 10.1016/j.jsb.2016.03.006. Epub 2016 , Mar 8. PMID:26968363 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Tubulin 3D Structures

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