PMID: 16593496Aug 1, 1984Paper

Isoelectric focusing of plant cell membranes

Proceedings of the National Academy of Sciences of the United States of America
L R Griffing, R S Quatrano


An isoelectric focusing method is described that discriminates plant cell organelle populations on the basis of surface charge. The isoelectric points (pI values) of the Golgi apparatus, the mitochondria, and putative plasma membrane from etiolated pea stem cells are reported. The pI of the pea Golgi apparatus is similar to that of the (35)SO(4)-labeled membranes of developing Fucus embryos. The pI of Fucus(35)SO(4)-labeled membranes depends on whether the membranes are being polarly transported to the growing tip or randomly transported to the entire periphery of the zygote. Those subject to polar tip transport have a significantly greater negative surface charge than those being randomly transported. The implication of this result toward an understanding of the localization mechanism is discussed. The method is also capable of subfractionating glucan synthetase II-containing membranes (putative plasma membrane) from peas. The pI of putative plasma membrane from a pea stem homogenate is similar to the pI of the plasma membrane of whole protoplasts of Catharanthus leaf cells. Isoelectric focusing appears to be a useful technique to discriminate membranes and, hence, to provide new information and approaches to study cellular an...Continue Reading


Apr 4, 1979·Biochimica Et Biophysica Acta·H E AkerlundP A Albertsson
Jan 1, 1977·Annual Review of Biophysics and Bioengineering·L F Jaffe, R Nuccitelli
Jul 1, 1978·Analytical Biochemistry·J Holtlund, T Kristensen
Dec 1, 1968·Analytical Biochemistry·N Catsimpoolas

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Feb 1, 1991·Journal of Electron Microscopy Technique·L R Griffing
Mar 6, 1999·Journal of Chromatography. B, Biomedical Sciences and Applications·H CanutG Weber
Sep 1, 1986·Plant Physiology·M E Steele, R G Stout
Jan 1, 1991·Plant Physiology·M A Santana, L Villegas
Jun 1, 1992·Microbiological Reviews·D L Kropf

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