![](https://static.igem.org/mediawiki/2017/6/6d/T--Manchester--bmc.png)
Bacterial microcompartments are organelles consisting of a protein shell that encases enzymes and other proteins
![](https://static.igem.org/mediawiki/2017/a/a9/T--Manchester--ppk_p_chain.png)
PPK is an enzyme that builds up a polyphosphate chain
![](https://static.igem.org/mediawiki/2017/d/d3/T--Manchester--ppx_p_chain.png)
PPX is an enzyme that breaks down the polyphosphate chain
![](https://static.igem.org/mediawiki/2017/5/59/T--Manchester--ppk_ppx_p_chain_in_bmc.png)
Tagging PPK into microcompartments causes build up of polyphosphate and prevents polyphosphate degradation by PPX