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Protein A - esonn

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Imaging PIP 2 in vivo using PH-GFP chimeras<br />

• PIP 2<br />

is rapidly broken down upon activation of e.g. the angiotensin receptor<br />

• A fusion protein PH_GFP, composed of a green fluorescent protein (GFP) and a<br />

PH domain binds to PIP 2<br />

in the plasma membrane<br />

• Angiotensin addition leads to PIP 2<br />

breakdown<br />

=> PH-GFP can not bind to the membrane anymore<br />

PI(4,5)P 2<br />

specific domain:<br />

- [PI(4,5)P 2<br />

] high in membrane<br />

- Angiotensin promotes breakdown<br />

Balla, TiPS 2000<br />

14

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