Filament formation in vitro of a sieve tube protein from Cucurbita maxima and Cucurbita pepo

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1975 English Publisher:Springer Science and Business Media LLCJournal:Planta, volume 127, pages 163-170 (issn: 0032-0935, eissn: 1432-2048,

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Authors: H, Kleinig; J, Thönes; I, Dörr; R, Kollmann;

doi: 10.1007/bf00388377

pmid: 24430373

Filament formation in vitro of a sieve tube protein from Cucurbita maxima and Cucurbita pepo

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Abstract

Phloem proteins of the sieve tube exudate from Cucurbita maxima Duch. and Cucurbita pepo L. were investigated as to their filament forming ability in vitro. From the two main proteins (116000 dalton, 30000 dalton) only the 116000 dalton protein was found to form reversibly distinct filaments of 6-7 nm diameter upon removal of SH-protecting agents from the buffer, whereas the 30000 dalton protein was precipitated as amorphous material under these conditions. The protein filaments were similar to the filaments ocurring within the sieve tube cells in vivo.

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