OTA will break your root. The best way to go about this is to download the app Voodoo OTA Rootkeeper. You open it and select "protect root." Then you "temp unroot," take the OTA, when its fully installed and the phone has rebooted open the app and "restore root."
This comes in handy because for the new updates the old root method does not always work.
In SuperSU can't you go to settings and at the bottom there is an option for full unroot? This may only work for the paid version of the app, I don't remember. If you do do this though you'll need to re-root.
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