From Rings to Layers: Surprising Patterns of Protein Deposition during Bacterial Spore Assembly

Elucidation of the mechanisms of assembly of subcellular structures is often an elusive goal.The large number of component parts and the intricate ways in which they interact make experimental analysis a significant challenge and, in particular, frustrate attempts at traditional reductionist analysis.Frequently, key insights come from thoughtful cell biological observations that identify the most important steps in assembly.In the best cases, not only do these observations provide critical clues to old problems, but they also generate novel areas of investigation.An example of a finding that does both of these things comes from the work of van Ooij et al. (36a), published in this issue, who used careful cell biological analysis to uncover a novel dimension of the process by which bacterial spores assemble their external armor plating.These authors found that the deposition of external proteins on the spore surface is unexpectedly dynamic, pointing towards as-yet-unknown regulatory mechanisms controlling spore formation.