AK, preflop action

[Ugge]

Villian is 19/7/1.7

Poker Stars
No Limit Holdem Ring game
Blinds: $0.02/$0.05
7 players
Converter

Stack sizes:
Hero: $4.76
UTG+1: $9.94
MP1: $11.03
CO: $3.12
Button: $9.49
SB: $5.21
BB: $1.85

Pre-flop: (7 players) Hero is UTG with K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/diamond.gif[/img]
<font color="#cc0000">Hero raises to $0.15</font>, 3 folds, <font color="#cc0000">Button raises to $0.3</font>, SB folds, BB calls, <font color="#cc0000">Hero raises to $0.9</font>, <font color="#cc0000">Button raises to $5.2</font>, BB folds, <font color="#cc0000">Hero calls all-in $3.86</font>.
Uncalled bets: $0.44 returned to Button.

Can I be sure he has me beat when he raises me that fourth time and lay down my hand? Should I have pushed instead of raising 0.9 after he raised me the first time?

[quarkncover]

I would not 4-bet OOP with AKo, I would fold to the 5-bet from this tight of an opponent.