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Journal of Bacteriology, August 2009, p. 5123-5133, Vol. 191, No. 16
0021-9193/09/$08.00+0     doi:10.1128/JB.00620-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Characterization of the Synechocystis Strain PCC 6803 Penicillin-Binding Proteins and Cytokinetic Proteins FtsQ and FtsW and Their Network of Interactions with ZipN{triangledown}

Martial Marbouty,1 Khalil Mazouni,1,{dagger} Cyril Saguez,1 Corinne Cassier-Chauvat,1,2 and Franck Chauvat1*

CEA, iBiTec-S SBIGeM LBI,1 URA 2096 CNRS, Bat. 142, CEA, Saclay F-91191, Gif sur Yvette CEDEX, France2

Received 12 May 2009/ Accepted 8 June 2009

Because very little is known about cell division in noncylindrical bacteria and cyanobacteria, we investigated 10 putative cytokinetic proteins in the unicellular spherical cyanobacterium Synechocystis strain PCC 6803. Concerning the eight penicillin-binding proteins (PBPs), which define three classes, we found that Synechocystis can survive in the absence of one but not two PBPs of either class A or class C, whereas the unique class B PBP (also termed FtsI) is indispensable. Furthermore, we showed that all three classes of PBPs are required for normal cell size. Similarly, the putative FtsQ and FtsW proteins appeared to be required for viability and normal cell size. We also used a suitable bacterial two-hybrid system to characterize the interaction web among the eight PBPs, FtsQ, and FtsW, as well as ZipN, the crucial FtsZ partner that occurs only in cyanobacteria and plant chloroplasts. We showed that FtsI, FtsQ, and ZipN are self-interacting proteins and that both FtsI and FtsQ interact with class A PBPs, as well as with ZipN. Collectively, these findings indicate that ZipN, in interacting with FtsZ and both FtsI and FtQ, plays a similar role to the Escherichia coli FtsA protein, which is missing in cyanobacteria and chloroplasts.

* Corresponding author. Mailing address: CEA, iBiTec-S SBIGeM LBI, Bat. 142, CEA Saclay F-91191, Gif sur Yvette CEDEX 91191, France. Phone: (33) 1 69 08 78 11. Fax: (33) 1 69 08 47 12. E-mail: franck.chauvat{at}cea.fr

{triangledown} Published ahead of print on 19 June 2009.

{dagger} Present address: Laboratoire de Génétique du Développement de la Drosophile, Département de Biologie du Développement, Institut Pasteur 25 rue du Docteur Roux, 75015 Paris, France.

Journal of Bacteriology, August 2009, p. 5123-5133, Vol. 191, No. 16
0021-9193/09/$08.00+0     doi:10.1128/JB.00620-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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