from Triose Phosphate Isomerase

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I. Introduction

This structure shows the most common way to connect two parallel beta strands - using a helix which passes over the top of the beta sheet and demonstrates right hand crossover connectivity. This structure is from triose phosphate isomerase.

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

II. General Structure

Backbone and sidechains
Cartoon showing hydrogen bonds
Cartoon and Wireframe
Dot surface and Wireframe