Abstract
The DNA-binding HU type proteins isolated from Rhizobium meliloti. (strain 2011 Str 3), Rizobium leguminosarum (strains L18 and L53), Rhizobium japonicum (strain J 5) and Agrobacterium tumefaciens (strain B 6) were prepared by affinity chromatography on DNA-cellulose prepared with DNA from Rhizobium meliloti. These proteins are respectively called HRm, HRl18, HR153, HRj and HAt. The HU protein isolated from Escherichia Coli is associated with the chromosomal and extrachromosomal DNA and seems to be involved in the condensation of the DNA. HU protein is a low molecular weight (Mr 9500) and sligtly basic protein. Similar proteins have been isolated from other species widely remote in the bacterial kingdom.
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