NDLI: An extracellular insoluble inhibitor of cysteine proteinases in cell cultures and seeds of carrot

Content Provider	Springer Nature Link
Author	Ojima, Akiko Shiota, Hajime Higashi, Katsumi Kamada, Hiroshi Shimma, Yoh ichi Wada, Masato Satoh, Shibu
Copyright Year	1997
Abstract	An 18 kDa extracellular insoluble protein (EIP18) was found previously in amorphous particles suspended in the culture medium and in the interspaces of cell clusters of carrot (Daucus carota L.) callus, as well as in the extracellular spaces of carrot seeds, being located both in the embryo and at the inner edge of the endosperm. We purified EIP18 by washing the amorphous particles with the mixture of Triton X-100, NaCl and ethylenediaminetetraacetic acid (EDTA). We determined several partial amino acid sequences, and then we cloned and sequenced a cDNA for EIP18. EIP18 was found to consist of 133 amino acid residues that included a signal sequence, but it did not contain cysteine, sites for N-linked glycosylation or hydrophobic regions. Since its sequence was found to be homologous to that of inhibitors of cysteine proteinases, namely cystatins, EIP18 was renamed EICC (extracellular insoluble cystatin of carrot). EICC expressed in yeast was also found in an insoluble form in yeast cell walls. EICC prepared from the culture medium of carrot cells inhibited commercial cysteine proteinases and a proteinase extracted from germinating carrot seeds. The expression of the gene for EICC was detected in developing seeds, and the level of its transcript was markedly enhanced upon treatment of somatic embryos with abscisic acid.
Starting Page	99
Ending Page	109
Page Count	11
File Format	PDF
ISSN	01674412
Journal	Plant Molecular Biology
Volume Number	34
Issue Number	1
e-ISSN	15735028
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochemistry Plant Sciences Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Agronomy and Crop Science

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