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Molecular and Cellular Biology, September 2001, p. 5838-5845, Vol. 21, No. 17
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.17.5838-5845.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Chl12 (Ctf18) Forms a Novel Replication Factor C-Related Complex and Functions Redundantly with Rad24 in the DNA Replication Checkpoint Pathway

Takahiro Naiki,1 Tae Kondo,1 Daisuke Nakada,1 Kunihiro Matsumoto,1,2 and Katsunori Sugimoto1,*

Division of Biological Science, Graduate School of Science, Nagoya University,1 and CREST, Japan Science and Technology Corporation (JST),2 Chikusa-ku, Nagoya 464-0814, Japan

Received 5 March 2001/Returned for modification 23 April 2001/Accepted 4 June 2001

RAD24 has been identified as a gene essential for the DNA damage checkpoint in budding yeast. Rad24 is structurally related to subunits of the replication factor C (RFC) complex, and forms an RFC-related complex with Rfc2, Rfc3, Rfc4, and Rfc5. The rad24Delta mutation enhances the defect of rfc5-1 in the DNA replication block checkpoint, implicating RAD24 in this checkpoint. CHL12 (also called CTF18) encodes a protein that is structurally related to the Rad24 and RFC proteins. We show here that although neither chl12Delta nor rad24Delta single mutants are defective, chl12Delta rad24Delta double mutants become defective in the replication block checkpoint. We also show that Chl12 interacts physically with Rfc2, Rfc3, Rfc4, and Rfc5 and forms an RFC-related complex which is distinct from the RFC and RAD24 complexes. Our results suggest that Chl12 forms a novel RFC-related complex and functions redundantly with Rad24 in the DNA replication block checkpoint.

* Corresponding author. Mailing address: Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-0814, Japan. Phone: 81-52-789-2593. Fax: 81-52-789-2589. E-mail: j46036a{at}nucc.cc.nagoya-u.ac.jp.

Molecular and Cellular Biology, September 2001, p. 5838-5845, Vol. 21, No. 17
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.17.5838-5845.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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