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Substrate-binding domain of ABC-type osmoregulated transporter; the type 2 periplasmic-binding protein fold Osmoprotectant binding lipoprotein ProWY of Streptococcus thermophilus is predicted to be involved in uptake of compatible solutes such as choline, L-proline and glycine betaine, but the relative substrate preference is not known. To counteract the efflux of water, microorganisms accumulate the compatible solutes for a sustained adjustment to high osmolarity surroundings. ProWY belongs to the type 2 periplasmic binding fold protein superfamily (PBP2). The PBP2 proteins are typically comprised of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",