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First published online June 3, 2005; 10.1105/tpc.105.032094

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The Plant Cell 17:2009-2019 (2005)
© 2005 American Society of Plant Biologists

Lipid Transfer Proteins Enhance Cell Wall Extension in Tobacco{boxw}

Jeroen Nieuwlanda,1,2, Richard Ferona, Bastiaan A.H. Huismanb,3, Annalisa Fasolinob, Cornelis W. Hilbersb, Jan Derksena and Celestina Mariania

a Institute for Wetland and Water Research, Department of Experimental Botany, Radboud University Nijmegen, 6525 ED Nijmegen, The Netherlands
b Institute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, The Netherlands

2 To whom correspondence should be addressed. E-mail j.nieuwland{at}biotech.cam.ac.uk; fax 44-1223-334162.

Plant cells are enclosed by a rigid cell wall that counteracts the internal osmotic pressure of the vacuole and limits the rate and direction of cell enlargement. When developmental or physiological cues induce cell extension, plant cells increase wall plasticity by a process called loosening. It was demonstrated previously that a class of proteins known as expansins are mediators of wall loosening. Here, we report a type of cell wall–loosening protein that does not share any homology with expansins but is a member of the lipid transfer proteins (LTPs). LTPs are known to bind a large range of lipid molecules to their hydrophobic cavity, and we show here that this cavity is essential for the cell wall–loosening activity of LTP. Furthermore, we show that LTP-enhanced wall extension can be described by a logarithmic time function. We hypothesize that LTP associates with hydrophobic wall compounds, causing nonhydrolytic disruption of the cell wall and subsequently facilitating wall extension.




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