Folding AK to early pushes

[Taraz]

I am routinely calling in these spots at the 11s-33s, but I'm thinking it may be a huge leak. Should I be folding here?

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) internettexasholdem.com

UTG (t620)
UTG+1 (t425)
MP1 (t1750)
MP2 (t1080)
Hero (t1145)
CO (t555)
Button (t865)
SB (t790)
BB (t770)

Preflop: Hero is MP3 with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img].

4 folds, Hero raises to t90, 1 fold, Button calls, 1 fold, BB raises all-in t770, Hero???