cDNA encoding a polypeptide including a hevein sequence

Details cDNA encoding a polypeptide including a hevein sequence cDNA encoding a polypeptide including a hevein sequence

1992-05-26

1999-05-04

Wax, Robert A.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536 27, 435 691, C07H 2104

Patent

active

059004800

ABSTRACT:
A cDNA clone (HEV1) encoding hevein was isolated via polymerase chain reaction (PCR) using mixed oligonucleotides corresponding to two regions of hevein as primers and a Hevea brasiliensis latex cDNA library as a template. HEV1 is 1018 nucleotides long and includes an open reading frame of 204 amino acids. The deduced amino acid sequence contains a putative signal sequence of 17 amino acid residues followed by a 187 amino acid polypeptide. The amino-terminal region (43 amino acids) is identical to hevein and shows homology to several chitin-binding proteins and to the amino-termini of wound-induced genes in potato and poplar. The carboxyl-terminal portion of the polypeptide (144 amino acids) is 74-79% homologous to the carboxyl-terminal region of wound-inducible genes of potato. Wounding, as well as application of the plant hormones abscisic acid and ethylene, resulted in accumulation of hevein transcripts in leaves, stems and latex, but not in roots, as shown by using the cDNA as a probe. A fusion protein was produced in E. coli from the protein of the present invention and maltose binding protein produced by the E. coli.

REFERENCES:
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Broekaert et al. Oct. 1990. Proc. Natl. Acad. Sci. 87:7633-7637.
Broekaert, W. Sep. 1988. "Chitinases and Chitin-Binding Lectins in Plants: A Biochemical and Physiological Study of Their Role in the Natural Protection of Plants Against Fungi", Dissertationes De Agricultura, Doctoraatsproefschrift Nr. 167 aan de Faculteit der Landbouwwetenschappen van de K. U. Leuven, pp. 73-84 and the Abstract.

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