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TheBacillus subtilis spore is encased in a resilient, multilayered proteinaceous shell, called the coat, that protects it from the environment. A 181-amino-acid coat protein called CotE assembles into the coat early in spore formation and plays a morphogenetic role in the assembly of the coat’s outer layer. We have used a series of mutant alleles ofcotE to identify regions involved in outer coat protein assembly. We found that the insertion of a 10-amino-acid epitope, between amino acids 178 and 179 of CotE, reduced or prevented the assembly of several spore coat proteins, including, most likely, CotG and CotB. The removal of 9 or 23 of the C-terminal-most amino acids resulted in an unusually thin outer coat from which a larger set of spore proteins was missing. In contrast, the removal of 37 amino acids from the C terminus, as well as other alterations between amino acids 4 and 160, resulted in the absence of a detectable outer coat but did not prevent localization of CotE to the forespore. These results indicate that changes in the C-terminal 23 amino acids of CotE and in the remainder of the protein have different consequences for outer coat protein assembly.

Functional Regions of the Bacillus subtilis Spore Coat Morphogenetic Protein CotE