Found a ParB in a Cluster B phage? As far as we know, the ParB domain containing gene in the Cluster B phages is not a true ParB protein. We have been unable to make lysogens from Cluster B phages, and so we do not think this is a Partitioning Protein like the ParAB system found in some Cluster A phages. As a general rule of thumb, we never assign "ParB" as a function to a gene in which we can not also identify a ParA.
If your "ParB" has really good evidence, you may assign it the function of "ParB-like nuclease domain".
Edited 01 Mar, 2018 15:41