title: Characterization of recognition sites on bacteriophage HP1c1 DNA which interact with the DNA uptake system of Haemophilus influenzae Rd.
abstract: The 32.4-kb genome of the Haemophilus influenzae bacteriophage HP1c1 contains at least twelve sites, each conferring high affinity for the DNA uptake system of transformable H. influenzae Rd. Five of these high-affinity sites have been located and their nucleotide sequences determined. Three sites contained a contiguous 9-bp sequence identical to the first nine residues of the 11-bp site previously identified as conferring high affinity for the H. influenzae transformation receptor to DNA fragments. The remaining two sites contained complete 11-bp sequences. In contrast, an HP1c1 restriction fragment containing a sequence identical to the final nine residues of the 11-bp uptake site exhibits only a low affinity for the DNA uptake system. An 8-bp sequence consisting of the first eight residues of the 11-bp site was 1% as active as the longer, high-affinity sites. Thus the first 9-bp of the 11-bp site are sufficient to direct high-affinity uptake, while the first 8-bp or the distal 9-bp are not. These results provide an initial assessment of the relative contributions of the individual residues constituting the 11-bp site to the apparent affinity of DNA fragments for the receptor of Haemophilus transformation.
mesh_terms: D001435:Bacteriophages / Q000235:genetics*; D001693:Biological Transport, Active; D004262:DNA Restriction Enzymes; D004269:DNA, Bacterial / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics* / Q000378:metabolism; D006193:Haemophilus influenzae / Q000235:genetics* / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism*; D014162:Transfection; D014170:Transformation, Genetic
chemical_list: C033365:DNA receptor; D004269:DNA, Bacterial; D004279:DNA, Viral; D011956:Receptors, Cell Surface; D004262:DNA Restriction Enzymes