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Plant Physiol, September 2000, Vol. 124, pp. 211-222
Co-Association of Cytochrome f Catabolites and
Plastid-Lipid-Associated Protein with Chloroplast Lipid
Particles1
Matthew D.
Smith,2
Donny D.
Licatalosi,3 and
John E.
Thompson*
Department of Biology, University of Waterloo, Waterloo, Ontario,
Canada N2L 3G1
Distinguishable populations of lipid particles isolated from
chloroplasts of yellow wax bean (Phaseolus vulgaris L. cv Kinghorn Wax) leaves have been found to contain
plastid-lipid-associated protein (J. Pozueta-Romero, F. Rafia, G. Houlné, C. Cheniclet, J.P. Carde, M.-L. Schantz, R. Schantz
[1997] Plant Physiol 115: 1185-1194). One population is comprised of
plastoglobuli obtained from sonicated chloroplasts by flotation
centrifugation. Higher density lipid-protein particles isolated from
chloroplast stroma by ultrafiltration constitute a second population.
Inasmuch as the stromal lipid-protein particles contain
plastid-lipid-associated protein, but are distinguishable from
plastoglobuli in terms of their lipid and protein composition, they
appear to be plastoglobuli-like particles. Of particular interest is
the finding that plastoglobuli and the higher density lipid-protein
particles both contain catabolites of the thylakoid protein, cytochrome
f. These observations support the view that there are
distinguishable populations of plastoglobuli-like particles in
chloroplasts. They further suggest that the formation of these
particles may allow removal of protein catabolites from the thylakoid
membrane that are destined for degradation as part of normal thylakoid turnover.
1
This work was supported by the Natural Sciences
and Engineering Research Council of Canada. M.D.S. received a PGS-B
student scholarship from the Natural Sciences and Engineering Research Council of Canada.
2
Present address: Department of Biological Sciences,
Rutgers University, Newark, NJ 07102.
3
Present address: Department of Biochemistry, University
of Colorado Health Sciences Center, Denver, CO 80262.
*
Corresponding author; e-mail jet{at}sciborg.uwaterloo.ca; fax
519-746-2543.
© 2000 American Society of Plant Physiologists
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