3SZ7
Crystal structure of the Sgt2 TPR domain from Aspergillus fumigatus
Summary for 3SZ7
| Entry DOI | 10.2210/pdb3sz7/pdb |
| Descriptor | Hsc70 cochaperone (SGT) (2 entities in total) |
| Functional Keywords | tpr domain, cochaperone, get4, get5, get3, mdy2, ssa1, sse1, hsp104, hsc82, chaperone regulator |
| Biological source | Aspergillus fumigatus |
| Total number of polymer chains | 1 |
| Total formula weight | 17268.11 |
| Authors | Chartron, J.W.,Gonzalez, G.M.,Clemons Jr., W.M. (deposition date: 2011-07-18, release date: 2011-08-10, Last modification date: 2023-09-13) |
| Primary citation | Chartron, J.W.,Gonzalez, G.M.,Clemons, W.M. A structural model of the Sgt2 protein and its interactions with chaperones and the Get4/Get5 complex. J.Biol.Chem., 286:34325-34334, 2011 Cited by PubMed Abstract: The insertion of tail-anchored transmembrane (TA) proteins into the appropriate membrane is a post-translational event that requires stabilization of the transmembrane domain and targeting to the proper destination. Sgt2 is a heat-shock protein cognate (HSC) co-chaperone that preferentially binds endoplasmic reticulum-destined TA proteins and directs them to the GET pathway via Get4 and Get5. Here, we present the crystal structure from a fungal Sgt2 homolog of the tetratrico-repeat (TPR) domain and part of the linker that connects to the C-terminal domain. The linker extends into the two-carboxylate clamp of the TPR domain from a symmetry-related molecule mimicking the binding to HSCs. Based on this structure, we provide biochemical evidence that the Sgt2 TPR domain has the ability to directly bind multiple HSC family members. The structure allows us to propose features involved in this lower specificity relative to other TPR containing co-chaperones. We further show that a dimer of Sgt2 binds a single Get5 and use small angle x-ray scattering to characterize the domain arrangement of Sgt2 in solution. These results allow us to present a structural model of the Sgt2-Get4/Get5-HSC complex. PubMed: 21832041DOI: 10.1074/jbc.M111.277798 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.72 Å) |
Structure validation
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