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PLANT PHYSIOLOGY , Vol 104, Issue 2 711-717, Copyright © 1994 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Two Classes of Proteins and mRNAs in Lilium longiflorum L. Identified by Human Vitronectin Probes

C. S. Wang, L. L. Walling, Y. Q. Gu, C. F. Ware and E. M. Lord
Department of Botany and Plant Sciences (C.-S.W., L.L.W., Y.Q.G., E.M.L.), and Division of Biomedical Sciences (C.F.W.), University of California, Riverside, California 92521-0124

Vitronectin (VN) is a substrate adhesion molecule, an extracellular matrix glycoprotein that facilitates cell adhesion and cell movement in animals. We have reported the cross-reactivity of a 55-kD protein in plants with rabbit anti-human VN antibodies and the presence of VN-like sequences in plant genomes using a human VN cDNA probe. We have extended these studies by using human VN riboprobes to detect VN-like mRNAs in lily (Lilium longiflorum L.) and soybean. In both species, two mRNAs were detected. We have also identified a new cross-reactive protein (41 kD) using a different preparation of human VN antiserum. In lily roots five 41-kD isoforms were observed, whereas only three of these isoforms accumulated in leaves. Monospecific antibodies prepared against the plant proteins cross-reacted with the human VN protein and vice versa. We have purified the 41-kD protein using two-dimensional gel electrophoresis, and amino acid composition analysis indicates that it is similar in composition to human VN.


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