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Purification, characterization, and molecular gene cloning of an antifungal protein from Ginkgo biloba seeds

  • Yoriko Sawano , Takuya Miyakawa , Hiroshi Yamazaki , Masaru Tanokura und Ken-ichi Hatano
Veröffentlicht/Copyright: 5. März 2007
Biological Chemistry
Aus der Zeitschrift Band 388 Heft 3

Abstract

A novel basic protein with antifungal activity was isolated from the seeds of Ginkgo biloba and purified to homogeneity. The protein inhibited the growth of some fungi (Fusarium oxysporum, Trichoderma reesei, and Candida albicans) but did not exhibit antibacterial action against Escherichia coli. Furthermore, this protein showed weak inhibitory activity against the aspartic protease pepsin. To design primers for gene amplification, the NH2-terminal and partial internal amino acid sequences were determined using peptides obtained from a tryptic digest of the oxidized protein. The full-length cDNA of the antifungal protein was cloned and sequenced by RT-PCR and rapid amplification of cDNA ends (RACE). The cDNA contained a 402-bp open reading frame encoding a 134-aa protein with a potential signal peptide (26 residues), suggesting that this protein is synthesized as a preprotein and secreted outside the cells. The antifungal protein shows approximately 85% identity with embryo-abundant proteins from Picea abies and Picea glauca at the amino acid level; however, there is no homology between this protein and other plant antifungal proteins, such as defensin, and cyclophilin-, miraculin- and thaumatin-like proteins.

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Published Online: 2007-03-05
Published in Print: 2007-03-01

©2007 by Walter de Gruyter Berlin New York

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