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Originally published In Press as doi:10.1074/jbc.M104945200 on August 15, 2001

J. Biol. Chem., Vol. 276, Issue 42, 38602-38609, October 19, 2001
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Purification and Characterization of Membrane-associated CooC Protein and Its Functional Role in the Insertion of Nickel into Carbon Monoxide Dehydrogenase from Rhodospirillum rubrum*

Won Bae Jeon, Jiujun Cheng, and Paul W. LuddenDagger

From the Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin, Madison, Wisconsin 53706

The accessory protein CooC, which contains a nucleotide-binding domain (P-loop) near the N terminus, participates in the maturation of the nickel center of carbon monoxide dehydrogenase (CODH). In this study, CooC was purified from the chromatophore membranes of Rhodospirillum rubrum with a 3,464-fold purification and a 0.8% recovery, and its biochemical properties were characterized. CooC is a homodimer with a molecular mass of 61-63 kDa, contains less than 0.1 atom of Ni2+ or Fe2+ per dimer, and has a lambda max at 277.5 nm (epsilon 277.5 32.1 mM-1 cm-1) with no absorption peaks at the visible region. CooC catalyzes the hydrolysis of ATP and GTP with Km values of 24.4 and 26.0 µM and Vmax values of 58.7 and 3.7 nmol/min/mg protein for ATP and GTP hydrolysis, respectively. The P-loop mutated form of K13Q CooC was generated by site-specific replacement of lysine by glutamine and was purified according to the protocol for wild-type CooC purification. The K13Q CooC was inactive both in ATP hydrolysis and in vivo nickel insertion. In vitro nickel activation of apoCODH in the cell extracts from UR2 (wild type) and UR871 (K13Q CooC) showed that activation of nickel-deficient CODH was enhanced by CooC and dependent upon ATP hydrolysis. The overall results suggest that CooC couples ATP hydrolysis with nickel insertion into apoCODH. On the basis of our results and models for analogous systems, the functional roles of CooC in nickel processing into the active site of CODH are presented.

* This work was supported by Department of Energy Science Grant DE-FG02-87ER13691 (to P. W. L.).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.

Dagger To whom correspondence should be addressed: Dept. of Biochemistry, 433 Babcock Dr., Madison, WI 53706. Tel.: 608-262-6859; Fax: 608-262-3453; E-mail: pludden@cals.wisc.edu.

Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.
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Copyright © 2001 by the American Society for Biochemistry and Molecular Biology.