Ultrastructural Features Underlying the Hexagonal Arrangement of Plasma Membrane-intercalated Particles of Saccharomyces cerevisiae

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Abstract
A hexagonal pattern on the E-face of the plasma membrane of S. cerevisiae which has a lattice period 1/2 of that on the P-face is described and the mechanism of the hexagonal distribution of these particles is discussed. In view of the close relationship between the hexagonal patterns on both faces, and of the pattern on the E-face being more complicated than that on the P-face, the existence of a protein network structure could be postulated as a possible mechanism by which plasma membrane-intercalated particles of S. cerevisiae assume the hexagonal distribution of 18 nm period. The hexagonal net of 9 nm period may be enlarged as the culture ages by the addition of protein monomers; the net may depolymerize to monomers under certain conditions, such as transfer to fresh cultural medium; and particles may be trapped in the net, either spacially in holes in the net, or by interaction with specific sites which exist at alternate lattice points on alternate lines of the hexagonal net.

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