Defending w/ ATo

[dmk]

Comments on my play here please. Villian has been playing well and hasn't gotten out of line.

PokerStars $100+9 NL
Blinds 15/30, Hero has T1800, Villian T2300.

Villian open-raises on the button to 90, SB calls, Hero calls w/ ATo.

(T270) Flop: AKJr. Hero bets T90, Villian hesitates and calls, SB folds.

(T450) Turn: A, 2 clubs. Hero checks, Villian bets T150, Hero calls.

(T750) River: 9r. Hero checks, Villian bets T540, Hero calls.

Thoughts on all streets?