Emsa Register Dll Tool Activation Key [EXCLUSIVE] 🔽
Download —>>> DOWNLOAD
Emsa Register Dll Tool Activation Key
to address the question of how well our observations of eukaryotic chromatin-dependent orc binding sites apply to other origins, and to examine whether origins that bind orc well also have late-activation times, we assayed the gemsa orc-origin binding strengths for several other groups of origins (figure 7a). we observed a distinct separation of the orc-origin binding strengths for early-firing and late-firing origins (figure 7b). this result indicated that the chromatin-dependent binding mechanisms observed at ars317 are not specifically unique to this origin, and that origins that bind orc well have late-activation times. this conclusion was also supported by dna binding domain (dbd) studies that showed that individual dbds of orc1 and orc2 bound chromatin well, yet they were incapable of activating replication at ars317 (figure 7c) . in addition, an in vitro ars317 system that used purified orc, cdc6 and cdt1 as subunits and chromatin in the absence of the mcm-double hexamer  indicated that the late-activation time of ars317 was dependent on the mcm-double hexamer (figure 7d) .
to examine the relationship between chromatin-dependent orc binding and late-activation times, we grouped chromatin-dependent origins into three classes based on their orc-origin binding strengths: class i origins were ars317 and the weakly bound origins; class ii origins were all of the origins that bound orc well; and class iii origins were the strongly bound origins ( figure 7e). it is important to note that because of the imperfect correlation between dna binding affinity and orc binding strength, the classifications in figure 7e are not mutually exclusive and some origins may fall into more than one class. we found that the late-activation time of class iii origins was significantly shorter than that of class i origins, while the late-activation time of class ii origins was no different from that of class i origins (figure 7f). we conclude that origins that bind orc well have late-activation times, and that mechanisms that confer the late-activation time are not present in weakly binding origins. we also observed that class iii origins were generally located within regions that bind orc well ( figure 7g). we hypothesized that this enrichment could be due to the recruitment of activators that, in turn, mediate the late-activation time of origins. while some activators were recruited to origins, including mcm10 at ars317  and mcm-double hexamer in vitro , the highly expressed origin ars1 required the active recruitment of other factors that may be different from the factors that mediate the late-activation time of ars317 . nevertheless, the data above indicated that a late-activation time was conferred to origins that bound orc well. we conclude that orc-origin binding strength is related to late-activation time. additional replication-timing assays are needed to validate this conclusion.
to determine which orc-origin binding sites are most important in vivo, we performed a pearson correlation analysis comparing the gemsa data and oridb data sets for the 11 bp acs at the various orc concentrations with respect to the total number of times this acs was enriched in the gemsa versus oridb ( fig. 7 ). as expected, the number of matches to the 11 bp acs in oridb datasets was positively correlated with the number of times the acs motif was enriched in the gemsa datasets, regardless of orc concentration. the greatest enrichment (1.7-fold) in oridb data was seen at the lowest orc concentration (0.3 nm), in contrast to the greatest enrichment (1.7-fold) seen in the gemsa data at the highest orc concentration (30 nm). although the significance of this correlation was not high, it was higher than the expected correlation for non-specific binding, as determined by a student t test analysis ( p