5SXL
Structure of EspG3 chaperone from the type VII (ESX-3) secretion system, space group P3221
Summary for 5SXL
| Entry DOI | 10.2210/pdb5sxl/pdb |
| Related | 4L4W 4RCL |
| Descriptor | ESX-3 secretion-associated protein EspG3 (2 entities in total) |
| Functional Keywords | esx-3, type vii secretion system, rv0289, protein secretion, chaperone |
| Biological source | Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155) |
| Total number of polymer chains | 1 |
| Total formula weight | 31866.91 |
| Authors | Korotkov, K.V. (deposition date: 2016-08-09, release date: 2016-08-24, Last modification date: 2024-03-06) |
| Primary citation | Tuukkanen, A.T.,Freire, D.,Chan, S.,Arbing, M.A.,Reed, R.W.,Evans, T.J.,Zenkeviciute, G.,Kim, J.,Kahng, S.,Sawaya, M.R.,Chaton, C.T.,Wilmanns, M.,Eisenberg, D.,Parret, A.H.A.,Korotkov, K.V. Structural Variability of EspG Chaperones from Mycobacterial ESX-1, ESX-3, and ESX-5 Type VII Secretion Systems. J. Mol. Biol., 431:289-307, 2019 Cited by PubMed Abstract: Type VII secretion systems (ESX) are responsible for transport of multiple proteins in mycobacteria. How different ESX systems achieve specific secretion of cognate substrates remains elusive. In the ESX systems, the cytoplasmic chaperone EspG forms complexes with heterodimeric PE-PPE substrates that are secreted from the cells or remain associated with the cell surface. Here we report the crystal structure of the EspG chaperone from the ESX-1 system determined using a fusion strategy with T4 lysozyme. EspG adopts a quasi 2-fold symmetric structure that consists of a central β-sheet and two α-helical bundles. In addition, we describe the structures of EspG chaperones from four different crystal forms. Alternate conformations of the putative PE-PPE binding site are revealed by comparison of the available EspG structures. Analysis of EspG, EspG, and EspG chaperones using small-angle X-ray scattering reveals that EspG and EspG chaperones form dimers in solution, which we observed in several of our crystal forms. Finally, we propose a model of the ESX-3 specific EspG-PE5-PPE4 complex based on the small-angle X-ray scattering analysis. PubMed: 30419243DOI: 10.1016/j.jmb.2018.11.003 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.46 Å) |
Structure validation
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