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Originally published In Press as doi:10.1074/jbc.M108799200 on December 26, 2001

J. Biol. Chem., Vol. 277, Issue 10, 7905-7912, March 8, 2002
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Regulation of Constitutively Expressed and Induced Cutinase Genes by Different Zinc Finger Transcription Factors in Fusarium solani f. sp. pisi (Nectria haematococca)*

Daoxin Li, Tatiana Sirakova, Linda Rogers, William F. EttingerDagger , and P.E. Kolattukudy§

From the Departments of Biochemistry and Molecular and Cellular Biochemistry and Neurobiotechnology Center, The Ohio State University, Columbus, Ohio 43210

Cutin monomers, generated by the low levels of constitutively expressed cutinase, induce high levels of cutinase that can help pathogenic fungi to penetrate into the host through the cuticle whose major structural polymer is cutin. We cloned three highly homologous cutinase genes, cut1, cut2, and cut3, from Fusarium solani f. pisi (Nectria haematococca). Amino acid sequence deduced from the nucleotide sequence of cut1 and cut2/3 matched with that of the peptides from cutinase 1 and cutinase 2, respectively, isolated from F. solani pisi grown on cutin as the sole carbon source. Induction of beta -glucuronidase gene fused to the promoters of the cutinases integrated into F. solani pisi genome indicates that cut2 is constitutively expressed and induced under starvation, whereas cut1 is highly induced by cutin monomers. A palindrome binding protein (PBP) previously cloned binds only to palindrome 1 of cut1 promoter but not palindrome 1 of cut2/3 which contains two base substitutions. PBP is thought to interfere with the binding of CTF1alpha , the transcription factor involved in induction, to cut1 promoter and thus keep cut1 gene repressed until induced by cutin monomers. Because PBP cannot bind palindrome 1 of cut2, this gene is not repressed. CTF1alpha does not transactivate cut2 promoter. A new Cys6Zn2 motif-containing transcription factor, CTF1beta , that binds palindrome 2 was cloned and sequenced. In yeast, CTF1beta transactivates cut2 promoter but not cut1 promoter unless its palindrome 1 is mutated, unlike CTF1alpha which transactivates cut1. Thus, CTF1beta is involved in the constitutive expression of cut2 that causes production of low levels of cutin monomers that strongly induce cut1 using CTF1alpha as the transcription factor.

* This work was supported in part by National Science Foundation Grant IBN-9816868.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EBI Data Bank with accession number(s) AF417004, AF417005, and U51672.

Dagger Present address: Dept. of Biology, Gonzaga University, Spokane, WA.

§ To whom correspondence should be addressed: Neurobiotechnology Center, Ohio State University, 206 Rightmire Hall, 1060 Carmack Rd., Columbus, OH 43210. Tel.: 614-292-5682; Fax: 614-292-5379; E-mail: kolattukudy.2@osu.edu.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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