Comparison of the cell envelope proteins of Micrococcus cryophilus with those of Neisseria and Branhamella species

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Abstract
In an attempt to elucidate the relation between M. cryophilus, N. caviae, N. ovis and B. catarrhalis, fractions derived from outer membranes of a strain of each organism were examined for protein composition by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. M. cryophilus outer membrane protein showed extensive similarities to that of N. ovis and contained a heat-modifiable protein which behaved almost identically with the corresponding bands previously shown to exist in N. caviae and N. ovis. B. catarrhalis protein was distinctly different from those of M. cryophilus and the 2 false neisserias, N. caviae and N. ovis.