Just want to point out a recent research topic in the Frontiers serie in Evolutionary and Genomic Microbiology dedicated to the PVC superphylum. This serie contains interesting contributions on the condensed state of the Planctomycetes genome, on the molecular signatures for the PVC clade, ... .
Of particular interest, is the article by Speth et al. whose genomic analysis indicates the presence of an asymmetric bilayer outer membrane in Planctomycetes and Verrucomicrobia. Very interesting article that provides more evidences against the exceptional aspect of the Planctomycetes membranes organisation. The presence of key genes in the Planctomycetes genomes indicates that the outer membrane is at least related to the outer membrane of other 'classical' (if there is any such thing) Gram-negative bacteria, see also the commentary by Yıldırım and Linke about the definition of a Gram-negative.
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