AK worth my stack here?

[ObnxNole]

$5/$10 no limit 6 max on prima. Hero $1200 is dealt A [img]/images/graemlins/diamond.gif[/img]K [img]/images/graemlins/club.gif[/img] in the small blind. Cutoff raises to $50. I call as does the big blind. Both players have me covered.
Flop:A [img]/images/graemlins/heart.gif[/img]5 [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/diamond.gif[/img]
I lead out for the full pot and get called by the big blind.

Cutoff folds. At this point I am not sure if he has a big Ace or a five. Pot stands at $550. What's your course of action on the turn?