Universität zu Köln

Sa-Moura, Bebiana ORCID: 0000-0003-2943-8818, Funakoshi, Minoru, Tomko, Robert J., Jr., Dohmen, R. Juergen, Wu, Zhiping, Peng, Junmin ORCID: 0000-0003-0472-7648 and Hochstrasser, Mark ORCID: 0000-0002-1131-5484 (2013). A Conserved Protein with AN1 Zinc Finger and Ubiquitin-like Domains Modulates Cdc48 (p97) Function in the Ubiquitin-Proteasome Pathway. J. Biol. Chem., 288 (47). S. 33682 - 33697. BETHESDA: AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC. ISSN 1083-351X

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Abstract

Regulated protein degradation mediated by the ubiquitin-proteasome system (UPS) is critical to eukaryotic protein homeostasis. Often vital to degradation of protein substrates is their disassembly, unfolding, or extraction from membranes. These processes are catalyzed by the conserved AAA-ATPase Cdc48 (also known as p97). Here we characterize the Cuz1 protein (Cdc48-associated UBL/zinc finger protein-1), encoded by a previously uncharacterized arsenite-inducible gene in budding yeast. Cuz1, like its human ortholog ZFAND1, has both an AN1-type zinc finger (Zf_AN1) and a divergent ubiquitin-like domain (UBL). We show that Cuz1 modulates Cdc48 function in the UPS. The two proteins directly interact, and the Cuz1 UBL, but not Zf_AN1, is necessary for binding to the Cdc48 N-terminal domain. Cuz1 also associates, albeit more weakly, with the proteasome, and the UBL is dispensable for this interaction. Cuz1-proteasome interaction is strongly enhanced by exposure of cells to the environmental toxin arsenite, and in a proteasome mutant, loss of Cuz1 enhances arsenite sensitivity. Whereas loss of Cuz1 alone causes only minor UPS degradation defects, its combination with mutations in the Cdc48(Npl4-Ufd1) complex leads to much greater impairment. Cuz1 helps limit the accumulation of ubiquitin conjugates on both the proteasome and Cdc48, suggesting a possible role in the transfer of ubiquitylated substrates from Cdc48 to the proteasome or in their release from these complexes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sa-Moura, Bebiana UNSPECIFIED orcid.org/0000-0003-2943-8818 UNSPECIFIED Funakoshi, Minoru UNSPECIFIED UNSPECIFIED UNSPECIFIED Tomko, Robert J., Jr. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dohmen, R. Juergen UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Zhiping UNSPECIFIED UNSPECIFIED UNSPECIFIED Peng, Junmin UNSPECIFIED orcid.org/0000-0003-0472-7648 UNSPECIFIED Hochstrasser, Mark UNSPECIFIED orcid.org/0000-0002-1131-5484 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-471846
DOI:	10.1074/jbc.M113.521088
Journal or Publication Title:	J. Biol. Chem.
Volume:	288
Number:	47
Page Range:	S. 33682 - 33697
Date:	2013
Publisher:	AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Place of Publication:	BETHESDA
ISSN:	1083-351X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language AAA ATPASE P97/VCP; TRANSCRIPTION FACTOR; GLOBAL ANALYSIS; ER; DEGRADATION; COMPLEX; STRESS; LINKS; UBX2; CDC48(UFD1/NPL4) Multiple languages Biochemistry & Molecular Biology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47184