AJ foldable in this spot?

[eternal_]

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($13.55)
MP ($6.45)
CO ($11.80)
Button ($4)
SB ($12.45)
BB ($15.90)

Preflop: Hero is UTG with J[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img]. MP posts a blind of $0.10. CO posts a blind of $0.15.
<font color="#CC3333">Hero raises to $0.6</font>, MP (poster) calls $0.50, <font color="#666666">4 folds</font>.

Flop: ($1.50) A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $1</font>, <font color="#CC3333">MP raises to $2</font>, Hero calls $1.

Turn: ($5.50) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $4</font>, MP calls $3.85 (All-In).

River: ($13.35) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: $13.35

Is this really foldable? Should I be here scared of a better A or deuces? Or some sicko A2? Also any ideas for a better line?