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. 1994 Mar;6(3):393–404. doi: 10.1105/tpc.6.3.393

A higher plant extracellular vitronectin-like adhesion protein is related to the translational elongation factor-1 alpha.

J K Zhu 1, B Damsz 1, A K Kononowicz 1, R A Bressan 1, P M Hasegawa 1
PMCID: PMC160442  PMID: 7514059

Abstract

Higher plant proteins immunologically related to the animal substrate adhesion molecule vitronectin have recently been observed and implicated in a variety of biological processes, such as plasma membrane-cell wall adhesion, pollen tube extension, and bacterium-plant interaction. We provide evidence that, similar to vitronectin, one of these proteins, PVN1 (plant vitronectin-like 1), isolated from 428 mM NaCl-adapted tobacco cells binds to glass surfaces an heparin. PVN1 was isolated by glass bead affinity chromatography. Isolated PVN1 has adhesive activity based on results from a baby hamster kidney cell-spreading assay. This plant adhesion protein was detected in all tissues examined but was most abundant in roots and salt-adapted cultured cells. Immunogold labeling indicated that PVN1 is localized in the cell wall of cortical and transmitting tissue cells of pollinated mature styles. A partial amino acid sequence of PVN1 revealed no similarity with vitronectin but, instead, was nearly identical to the translational elongation factor-1 alpha (EF-1 alpha). A clone isolated by screening a tobacco cDNA expression library with anti-PVN1 encoded a protein with greater than 93% identity to sequences of EF-1 alpha from plants of numerous species. Immunological cross-reactivity between tobacco PVN1 and EF-1 alpha as well as the reaction between the EF-1 alpha antibody and the 65- and 75-kD vitronectin-like proteins of a fucoidal alga supported the conclusion that the plant extracellular adhesion protein PVN1 is related to EF-1 alpha.

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Selected References

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