This protein contains almostly exclusively antiparallel beta structure. These types of proteins contains 4-10 twisted antiparallel beta strands in a ways in which two twisted beta sheets are formed which pack against each other in a barallel -like structure. This protein represents an up and down beta barallel (8 strands). The beta strands are connected by hairpins. RBP has 182 amino acids and binds and transports retinol (vitamin A) from the liver to other tissues. The ligand is bound inside the barallel in a site provided by the twisted beta strands.
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