3M7J

Crystal structure of the bacteriocin LLPA from pseudomonas sp. in complex with Met-mannose

Summary for 3M7J

• Entry DOI: 10.2210/pdb3m7j/pdb
• Related: 3M7H
• Descriptor: Putidacin L1, methyl alpha-D-mannopyranoside (3 entities in total)
• Functional Keywords: monocot mannose-binding lectin, bacteriocin, llpa, pseudomonas, bacterial toxin, siras, protein-sugar complex, mannose, antimicrobial protein
• Biological source: Pseudomonas sp.
• Total number of polymer chains: 2
• Total formula weight: 60375.80

Authors

Loris, R.,Garcia-Pino, A. (deposition date: 2010-03-16, release date: 2011-03-23, Last modification date: 2023-11-01)

Primary citation

Ghequire, M.G.,Garcia-Pino, A.,Lebbe, E.K.,Spaepen, S.,Loris, R.,De Mot, R.
Structural Determinants for Activity and Specificity of the Bacterial Toxin LlpA
Plos Pathog., 9:e1003199-e1003199, 2013

PubMed Abstract: Lectin-like bacteriotoxic proteins, identified in several plant-associated bacteria, are able to selectively kill closely related species, including several phytopathogens, such as Pseudomonas syringae and Xanthomonas species, but so far their mode of action remains unrevealed. The crystal structure of LlpABW, the prototype lectin-like bacteriocin from Pseudomonas putida, reveals an architecture of two monocot mannose-binding lectin (MMBL) domains and a C-terminal β-hairpin extension. The C-terminal MMBL domain (C-domain) adopts a fold very similar to MMBL domains from plant lectins and contains a binding site for mannose and oligomannosides. Mutational analysis indicates that an intact sugar-binding pocket in this domain is crucial for bactericidal activity. The N-terminal MMBL domain (N-domain) adopts the same fold but is structurally more divergent and lacks a functional mannose-binding site. Differential activity of engineered N/C-domain chimers derived from two LlpA homologues with different killing spectra, disclosed that the N-domain determines target specificity. Apparently this bacteriocin is assembled from two structurally similar domains that evolved separately towards dedicated functions in target recognition and bacteriotoxicity.

PubMed: 23468636
DOI: 10.1371/journal.ppat.1003199

Experimental method

X-RAY DIFFRACTION (2.26 Å)