Structural highlights
FunctionRLPA_PSEAE Lytic transglycosylase with a strong preference for naked glycan strands that lack stem peptides.[HAMAP-Rule:MF_02071] Publication Abstract from PubMedSPOR domains are widely present in bacterial proteins that recognize cell-wall peptidoglycan strands stripped of the peptide stems. This type of peptidoglycan is enriched in the septal ring as a product of catalysis by cell-wall amidases that participate in the separation of daughter cells during cell division. Here, we document binding of synthetic denuded glycan ligands to the SPOR domain of the lytic transglycosylase RlpA from Pseudomonas aeruginosa (SPOR-RlpA) by mass spectrometry and structural analyses, and demonstrate that indeed the presence of peptide stems in the peptidoglycan abrogates binding. The crystal structures of the SPOR domain, in the apo state and in complex with different synthetic glycan ligands, provide insights into the molecular basis for recognition and delineate a conserved pattern in other SPOR domains. The biological and structural observations presented here are followed up by molecular-dynamics simulations and by exploration of the effect on binding of distinct peptidoglycan modifications. Structural basis of denuded glycan recognition by SPOR domains in bacterial cell division.,Alcorlo M, Dik DA, De Benedetti S, Mahasenan KV, Lee M, Dominguez-Gil T, Hesek D, Lastochkin E, Lopez D, Boggess B, Mobashery S, Hermoso JA Nat Commun. 2019 Dec 5;10(1):5567. doi: 10.1038/s41467-019-13354-4. PMID:31804467[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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