Using the Protein Data Bank and BLAST from NCBI I found four proteins that have a known 3D structure and that were broadly conserved among many species of bacteria. The thumbnails on the right show an overview of each of these proteins aligned with very simliar proteins from other species. The multiple sequence alignments (MSAs) were generated by MUSCLE (Edgar, 2004), and the images were generated by Jalview (Waterhouse et al., 2009) using the Zappo color scheme, but here only columns with 100% conservation are colored to emphasize that some residues are very highly conserved. Click on a thumbnail for more detail.
MSAs
FtsZ small ftsZ msa
CoaD  coaD msa
YwtF  ywtF msa
RacE  racE msa
 zappo color schmee