Abstract: A mullion-transom structure has a supporting profiled element on which at least one filling element is retained at an edge, and a pressing strip by which at least one filling element is pressed toward the supporting profiled element. The pressing strip is retained on the supporting profiled element by at least one fastener, which fastener engages in a groove on the supporting profiled element. The groove is formed with an undercut and the at least one fastener is displaceably retained with a head segment in the groove. Preferably, the fastener embodies a bolt connected to a head segment, which head segment is pivotably held in a pre-mounted position on the groove of the supporting profiled element.