It depends on how "minor" it is. Aeolian and dorian are both considered "minor" keys. Dorian relates more to the minor pentatonic and blues scale we're used to. It flattens both the third and 7th degrees to give it a truly eerie but still musical quality.
The general rule is that aeolian=minor. Aeolian derives itself from the sixth degree of the major scale, so which major scale has E as it's 6?
G.
Okay, okay, so Lew and and everyone else already said so. But this is something I actually know about so nyeh!