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Journal of Bacteriology, September 2003, p. 5086-5095, Vol. 185, No. 17
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.17.5086-5095.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Protein Content of Polyhedral Organelles Involved in Coenzyme B12-Dependent Degradation of 1,2-Propanediol in Salmonella enterica Serovar Typhimurium LT2{dagger}

Gregory D. Havemann and Thomas A. Bobik*

Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida

Received 11 March 2003/ Accepted 21 May 2003

Salmonella enterica forms polyhedral organelles during coenzyme B12-dependent growth on 1,2-propanediol (1,2-PD). Previously, these organelles were shown to consist of a protein shell partly composed of the PduA protein, the majority of the cell's B12-dependent diol dehydratase, and additional unidentified proteins. In this report, the polyhedral organelles involved in B12-dependent 1,2-PD degradation by S. enterica were purified by a combination of detergent extraction and differential and density gradient centrifugation. The course of the purification was monitored by electron microscopy and gel electrophoresis, as well as enzymatic assay of B12-dependent diol dehydratase. Following one- and two-dimensional gel electrophoresis of purified organelles, the identities and relative abundance of their constituent proteins were determined by N-terminal sequencing, protein mass fingerprinting, Western blotting, and densitometry. These analyses indicated that the organelles consisted of at least 15 proteins, including PduABB'CDEGHJKOPTU and one unidentified protein. Seven of the proteins identified (PduABB'JKTU) have some sequence similarity to the shell proteins of carboxysomes (a polyhedral organelle involved in autotrophic CO2 fixation), suggesting that the S. enterica organelles and carboxysomes have a related multiprotein shell. In addition, S. enterica organelles contained four enzymes: B12-dependent diol dehydratase, its putative reactivating factor, aldehyde dehydrogenase, and ATP cob(I)alamin adenosyltransferase. This complement of enzymes indicates that the primary catalytic function of the S. enterica organelles is the conversion of 1,2-PD to propionyl coenzyme A (which is consistent with our prior proposal that the S. enterica organelles function to minimize aldehyde toxicity during growth on 1,2-PD). The possibility that similar protein-bound organelles may be more widespread in nature than currently recognized is discussed.

* Corresponding author. Mailing address: Department of Microbiology and Cell Science, University of Florida, Building 981, Room 1220, Gainesville, FL 32611. Phone: (352) 846-0957. Fax: (352) 392-5922. E-mail: bobik{at}ufl.edu.

{dagger} Florida Agricultural Experiment Station Journal Series no. R-09558.

Journal of Bacteriology, September 2003, p. 5086-5095, Vol. 185, No. 17
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.17.5086-5095.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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