The yeast cell wall consists of an internal skeletal layer and an outside protein layer. The synthesis of both beta-1,3-glucan and chitin, which together from the cell wall skeleton, is cell cycle-regulated. We show here that the expression of five cell wall protein-encoding genes (CWP1, CWP2, SED1, TIP1 and TIR1) is also cell cycle-regulated. TIP1 is expressed in G1 phase, CWP1, CWP2 and TIR1 are expressed in S/G2 phase, and SED1 in M phase. The data suggest that these proteins fulfil distinct functions in the cell wall.