Top 2 facing turn minraise, should I lay this down?

[We Major]

Villain is 64/6/.4..generally pretty bad and I've been value betting him all night. When he minraised me I was kind of suspicious but I thought he might be playing a hand like AQ or AK like this.

Full Tilt No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($23.45)
SB ($6.15)
BB ($15.10)
UTG ($18.95)
Hero ($36.50)
CO ($31.55)

Preflop: Hero is MP with J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls $0.25, <font color="#CC3333">Hero raises to $1.25</font>, <font color="#666666">4 folds</font>, UTG calls $1.

Flop: ($2.85) J[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $2.25</font>, UTG calls $2.25.

Turn: ($7.35) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $6</font>, <font color="#CC3333">UTG raises to $12</font>, Hero ?.