ABSTRACT
This chapter deals with extracytoplasmic lipids and focuses on those of the plasma membrane. The dissolution of cell wall glucans is influenced by pretreatments with dilute acid and some common explanation may emerge from further studies on lipid extractability. A. P. Tulloch and J. F. T. Spencer found that Rhodotorula graminis formed gram amounts of an unusual extracellular lipid per liter of aerated glucose medium. The compound contained d-mannitol, d-arabinitol, and xylitol in combination with 3-d-hydroxyhexa-decanoic and 3-d-hydroxyoctadecanoic acids. A glucose-binding lipoprotein has been isolated from Sacch cerevisiae plasma membrane. Relative transport rates for glucose across the plasma membranes of the Leucosporidium frigidum and Candida australis species were influenced by assay temperature in a manner reasonably consistent with growth temperature and fatty acid composition. Cells of Rhodotorula glutinus have a conspicuous slime layer which may also be endowed with polyol fatty acid esters.
