Major myo-inositol uptake transporter. Polyol metabolism; myo-inositol degradation into acetyl-CoA. Negatively regulated by IolR. Induced by inositol. When iolT is inactivated, inositol uptake is almost abolished even though iolF is active. Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family.