Abstract: Intact spinach(Spinacia oleracer L.)leaf peroxisomes convert glyceric acid to serine in the presence of NAD and alanine. The rate of conversion is lower in the intact peroxisomes than that in the broken one The reaction is completely dependent on NAD, but is only partially dependent on oxaloacet.te- The oxaloacetate can be replaced with a--ketoglutarate+ asparate. The peroxiso- mal membrane is sparsely permeable to NAD/NADH. The participation of the peroxisomal membrane transporter in an electron shuttle system across the memb- rane of peroxisomes in the regeneration of NAD/NADH is suggested.

Key words: Peroxisome