Retinol Binding Protein

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I. Introduction

This protein contains almost 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 barrel -like structure. This protein represents an up and down beta barrel (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 barrel in a site provided by the twisted beta strands.

For more information see Biochemistry Online: Chapter 2C - Understanding Protein Conformatio

II. General Structure

Backbone and sidechains
Cartoon, Hbonds and Wireframe
Dot surface and Wireframe