Structural highlights
FunctionPublication Abstract from PubMedThe immunoglobulin (Ig)-like domain is found in a broad range of proteins with diverse functional roles. While an essential beta-sandwich fold is maintained, considerable structural variations exist and are critical for functional diversity. The Rib-domain family, primarily found as tandem-repeat modules in the surface proteins of Gram-positive bacteria, represents another significant structural variant of the Ig-like fold. However, limited structural and functional exploration of this family has been conducted, which significantly restricts the understanding of its evolution and significance within the Ig superclass. In this work, a high-resolution crystal structure of a Rib domain derived from the probiotic bacterium Limosilactobacillus reuteri is presented. This protein, while sharing significant structural similarity with homologous domains from other bacteria, exhibits a significantly increased thermal resistance. The potential structural features contributing to this stability are discussed. Moreover, the presence of two copper-binding sites, with one positioned on the interface, suggests potential functional roles that warrant further investigation. Crystal structure of the Rib domain of the cell-wall-anchored surface protein from Limosilactobacillus reuteri.,Xue Y, Wu Z, Kang X Acta Crystallogr F Struct Biol Commun. 2024 Sep 1;80(Pt 9):228-233. doi: , 10.1107/S2053230X24007970. Epub 2024 Aug 28. PMID:39196706[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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