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J. Bacteriol., 09 1997, 5551-5559, Vol 179, No. 17
X Wang, J Huang, A Mukherjee, C Cao and J Lutkenhaus
The interaction of FtsZ with itself, GTP, and FtsA was examined by
analyzing the sensitivity of FtsZ to proteolysis and by using the yeast
two-hybrid system. The N-terminal conserved domain consisting of 320 amino
acids bound GTP, and a central region of FtsZ, encompassing slightly more
than half of the protein, was cross-linked to GTP. Site- directed
mutagenesis revealed that none of six highly conserved aspartic acid and
asparagine residues were required for GTP binding. These results indicate
that the specificity determinants for GTP binding are different than those
for the GTPase superfamily. The N- terminal conserved domain of FtsZ
contained a site for self-interaction that is conserved between FtsZ
proteins from distantly related bacterial species. FtsZ320, which was
truncated at the end of the conserved domain, was a potent inhibitor of
division although it expressed normal GTPase activity and could polymerize.
FtsZ was also found to interact directly with FtsA, and this interaction
could also be observed between these proteins from distantly related
bacterial species.
Copyright © 1997, American Society for Microbiology
Analysis of the interaction of FtsZ with itself, GTP, and FtsA
Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City 66160, USA.
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