Summary for 9MLH
| Entry DOI | 10.2210/pdb9mlh/pdb |
| EMDB information | 48372 |
| Descriptor | XptA2 protein (1 entity in total) |
| Functional Keywords | tca, pore forming toxin, toxin |
| Biological source | Xenorhabdus nematophila |
| Total number of polymer chains | 5 |
| Total formula weight | 1421960.94 |
| Authors | Aller, S.G.,Martin, C.L. (deposition date: 2024-12-19, release date: 2025-01-15, Last modification date: 2025-03-05) |
| Primary citation | Martin, C.L.,Hill, J.H.,Wright, B.D.,Fernandez, S.R.,Miller, A.L.,Yoon, K.J.,Lapi, S.E.,Aller, S.G. Evaluating TcAs for Use in Biotechnology Applications. BioTech (Basel), 14:-, 2025 Cited by PubMed Abstract: ABC toxin complexes (Tcs) are tripartite complexes that come together to form nano-syringe-like translocation systems. ABC Tcs are often compared with (Bt) toxins, and as such, they have been highly studied as a potential novel pesticide to combat growing insect resistance. Moreover, it is possible to substitute the cytotoxic hypervariable region with alternative peptides, which promise potential use as a novel peptide delivery system. These toxins possess the unique ability to form active chimeric holotoxins across species and display the capability to translocate a variety of payloads across membrane bilayers. Additionally, mutagenesis on the linker region and the receptor binding domains (RBDs) show that mutations do not inherently cause a loss of functionality for translocation. For these reasons, Tcs have emerged as an ideal candidate for targeted protein engineering. However, elucidation of the specific function of each RBD in relation to target receptor recognition currently limits the use of a rational design approach with any ABC Tc. Additionally, there is a distinct lack of targeting and biodistribution data for many Tcs among mammals and mammalian cell lines. Here, we outline two separate strategies for modifying the targeting capabilities of the A subunit (TcA) from , Xn-XptA2. We identify novel structural differences that make Xn-XptA2 different than other characterized TcAs and display the modular capabilities of substituting RBDs from alternative TcAs into the Xn-XptA2 scaffold. Finally, we show the first, to our knowledge, biodistribution data of any TcA in mice. PubMed: 39982272DOI: 10.3390/biotech14010005 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.9 Å) |
Structure validation
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