A roof system for use in a vehicle having a roof opening. The system includes a movable closure panel and a guide rail including a main channel and a pull cable slide channel both oriented to extend in a lengthwise direction relative to the vehicle. A longitudinal slot provides access to the pull cable slide channel. The system includes a front slide member and a pull cable actuator. The front slide member includes a first portion enclosed within the pull cable slide channel, and a second portion positioned within the main channel. The guide rail is configured to substantially prevent the front slide member from being discharged towards the roof opening. The actuator includes a rear slide member coupled to the front slide member, wherein the panel is coupled to the front slide member such that the actuator selectively covers and uncovers the roof opening with the panel.