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I. Introduction

Here is the structure of myoglobin, an oxygen-binding protein. The globin fold is found in many proteins and seems to represents natures way of designing a protein which can bind heme groups and serve as an oxygen carrier. It contains 8 helices (A-H) connected by short loops. The helices pack in a way that sequential helices are not packed next to each other. The helices form a hydrophobic binding pocket for the heme.

For more information see Biochemistry Online: Chapter 5C - Model Binding Systems 

II. General Structure

Backbone and Side chains
Heme and Trp sidechains (in Blue, Spacefill)
Cartoon, H bonds and wireframe
Dot surface and Wireframe