CHEM2052 Tutorial Example4

CHEM2052_Tutorial_Example4

spinqualitylabelsall models Renin (PDB code 2i4q) Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Chem2052: Example 4 - Renin The spinning structure you initially view on this page is a protease called Renin. Renin is an aspartyl protease, which cleaves a particular peptide called angiotensinogen. Background In later lecture we will look a little more closely at Renin (also known as angiotensinase). This enzyme is involved in a biological pathway leading to elevation of blood pressure, which can be beneficial in many ways. However if this process has become overactive, hypertension (high blood pressure) can result. Hypertension leads to cardiovascular disease which is the leading cause of death globally. The World Health Organisation states "An estimated 17.3 million people died from cardiovascular disease in 2008, representing 30% of all global deaths" see the following web page if you want to know more: Cardiovascular disease facts WHO. Since the 1970s scientists have been trying to modulate the action of renin by blocking the active site of the enzyme and preventing its function, hence lowering blood pressure. Aliskerin is the only renin inhibitor in clinical use today Renin information Site. However there is still interest in developing new, improved inhibitors. This question looks at a renin inhibitor identified through research at Pfizer. Active Site This representation illustrates the active site catalytic residues of Renin. Consider the mechanism of the enzymatic cleavage of the natural peptide substrate angiotensinase. Identify the structure of the transition state. In later lectures we will see how knowledge of this transition state can be used to design very effective enzyme inhibitors which mimic this structure, as you will find out, these are (not surprisingly) called "transition state" inhibitors. But for now though we will focus on the Pfizer inhibitor. Inhibition of Renin This scene shows the active site of renin with the Pfizer inhibitor bound. Which part of the inhibitor binds to the catalytic residues of the active site? Active Site Interactions Once you have thought about the types of interactions you would expect this inhibitor COULD make at the active site of the enzyme (refer to your notes for an example)then look at the 2-dimensional "map" of the active site on your tutorial sheet and compare this to the 3-dimensional representations here. This view shows the amino acid residues on the left hand side of your "map". This view shows the amino acid residues on the right hand side of your "map". Structural highlights This is a sample scene created with SAT to color by Group, and another to make a transparent representation of the protein. You can make your own scenes on SAT starting from scratch or loading and editing one of these sample scenes.

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