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Iran isn't necessarily after Israel per se; Iran is worried about not being able to dominate the Middle East. Taking out Saddam was a necessity, but his dictatorship version of Iraq was like a cork in a bottle. Iran has a population that is the same as Turkey's, which has the only army in the Middle East (other than the US') which can stand up to Iran's.

Saudi Arabia has 1/3 the population (and five million or so are guest workers, because the Saudis don't like to work for a living) and more armament than can actually be simultaneously used (analogous to the US situation with television sets), but probably can't defend itself.

Egypt is the same size as Iran, but its army can't fight its way out of a wet paper bag.

Iran plans to replace all the gov'ts in the region with theocracies, with itself at the top of the hegemonic pyramid. It will do it through covert means, by proxy, wherever possible (Iraq, Kuwait, Saudi Arabia, Lebanon, Gaza, and Syria, and possibly Egypt, are all currently in play); Turkey is under pressure from the Kurds, and my, isn't it awfully strange that some Kurdish terrorist faction suddenly has the ways and means to blow up stuff in Turkey?

When push gets to shove, I don't think the US will have to worry about Turkish help in the liberation of Iran.