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- W1582054712 abstract "Abstract An estimate was made of the amount of DNA packaged into gene 49 -defective heads when P49 is activated by a temperature shift. The uptake of DNA into preformed heads following activation of P49 was studied using bromo-deoxyuridine as a label. The rate of inactivation by visible light of the phage matured in the presence of BrdU as well as their buoyant density in CsCl, indicate that over half of the particles package, on the average, at least 25% of the DNA complement following P49 activation. This is a minimum estimate, since the BrdU-labeled DNA has to compete with unlabeled DNA. Analysis on alkaline sucrose gradients of the size of the DNA extracted from phage matured in the presence of BrdU following irradiation reveals that extended irradiation at 313 nm breaks the DNA close to half of its original size. These experiments clearly show that up to half of the DNA can be packaged into the preformed heads made at high temperature following activation of the product of gene 49 (P49), strongly supporting the pathway for phage head maturation described by Laemmli & Favre (1973). The so-called τ-particles, which accumulate in 24-defective cells, can serve as precursors of the mature phage (Bijlenga et al ., 1973). We have measured the uptake of BrdU-labeled DNA into τ-particles during their maturation. We find that a very large proportion of DNA made after activation of P24 is apparently incorporated into preformed τ-particles as these particles are converted into mature heads. This indicates that the τ-particles contain very little or no DNA prior to P24 activation and supports the pathway described by Laemmli & Favre (1973)." @default.
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- W1582054712 date "1974-10-01" @default.
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- W1582054712 title "Maturation of the head of bacteriophage T4" @default.
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- W1582054712 doi "https://doi.org/10.1016/0022-2836(74)90397-0" @default.
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