This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The 13 resolution structures of GroEL bound to a single monomer of the protein substrate glutamine synthetase (GSm), as well as that of unliganded GroEL have been determined from a heterogeneous image population using cryo-electron microscopy (cryo-EM) coupled with single particle image classification and reconstruction techniques. Structural data from cryo-EM maps and dynamic modeling were combined, taking advantage of the known X-ray crystallographic structure and normal mode flexible fitting (NMFF) analysis, to describe the changes that occur in GroEL structure induced by GSm binding. The NMFF analysis reveals that the molecular movements induced by GSm binding propagate throughout the GroEL structure. The modeled molecular motions show that some domains undergo en-bloc movements while others show more complex independent internal movements. Interestingly, the substrate-bound apical domains of both the cis (GS-bound ring) and trans (opposite substrate free ring) show counter-clockwise rotations, in the same direction (though not as dramatic) as those documented for the ATP-GroEL induced structure changes. The structural changes from the allosteric substrate protein-induced negative cooperativity between the GroEL rings involves upward concerted movements of both cis and trans equatorial domains toward the GSm bound ring while the interring distances between the heptamer contact residues are maintained. Furthermore, the NMFF analysis also identifies the secondary structural elements that are involved in the observed ~5 reduction in the diameter of the cavity opening in the unbound trans ring. Understanding the molecular basis of these substrate protein-induced structural changes across the heptamer rings provides insight into the origins of the allosteric negative cooperative effects that are transmitted over long distances (~140 ).
| Salmon, Loïc; Ahlstrom, Logan S; Horowitz, Scott et al. (2016) Capturing a Dynamic Chaperone-Substrate Interaction Using NMR-Informed Molecular Modeling. J Am Chem Soc 138:9826-39 |
| Bruno, Paul A; Morriss-Andrews, Alex; Henderson, Andrew R et al. (2016) A Synthetic Loop Replacement Peptide That Blocks Canonical NF-?B Signaling. Angew Chem Int Ed Engl 55:14997-15001 |
| Montiel-García, Daniel J; Mannige, Ranjan V; Reddy, Vijay S et al. (2016) Structure based sequence analysis of viral and cellular protein assemblies. J Struct Biol 196:299-308 |
| Rosen, Laura E; Kathuria, Sagar V; Matthews, C Robert et al. (2015) Non-native structure appears in microseconds during the folding of E. coli RNase H. J Mol Biol 427:443-53 |
| Cheng, Shanshan; Brooks 3rd, Charles L (2015) Protein-Protein Interfaces in Viral Capsids Are Structurally Unique. J Mol Biol 427:3613-3624 |
| Carrillo-Tripp, Mauricio; Montiel-García, Daniel Jorge; Brooks 3rd, Charles L et al. (2015) CapsidMaps: protein-protein interaction pattern discovery platform for the structural analysis of virus capsids using Google Maps. J Struct Biol 190:47-55 |
| Ahlstrom, Logan S; Law, Sean M; Dickson, Alex et al. (2015) Multiscale modeling of a conditionally disordered pH-sensing chaperone. J Mol Biol 427:1670-80 |
| Mustoe, Anthony M; Brooks, Charles L; Al-Hashimi, Hashim M (2014) Hierarchy of RNA functional dynamics. Annu Rev Biochem 83:441-66 |
| Nobrega, R Paul; Arora, Karunesh; Kathuria, Sagar V et al. (2014) Modulation of frustration in folding by sequence permutation. Proc Natl Acad Sci U S A 111:10562-7 |
| Arthur, Evan J; King, John T; Kubarych, Kevin J et al. (2014) Heterogeneous preferential solvation of water and trifluoroethanol in homologous lysozymes. J Phys Chem B 118:8118-27 |
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