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. 1978 Jul;75(7):3206–3210. doi: 10.1073/pnas.75.7.3206

Visualization of the intracellular development of bacteriophage lambda, with special reference to DNA packaging.

H Yamagishi, M Okamoto
PMCID: PMC392743  PMID: 356048

Abstract

To reveal intermediates in lambda DNA packaging, infected cells were osmotically ruptured and the cell lysates were deposited on electron microscope grids by sedimentation through a sucrose/formalin cushion. A fixation procedure that crosslinks head-related structures to DNA allowed us to study successive stages in the process of head filling. Three types of head-related structures can be distinguished: (i) empty heads (petit lambda), less angular in outline than complete lambda heads; (ii) heads partially filled with DNA (partially filled heads), having a roundish outline; and (iii) particles tightly packed with DNA (full heads), having a hexagonal outline. DNA-head complexes were bound either at the terminal end of a DNA thread or at a point intermediate along the thread. The terminal complexes were more abundant. No head-related structures could be found in an induced lambda mutant lysogen blocked in the synthesis of petit lambda (amber in lambda gene E). One type of mutant blocked in DNA packaging (amber in gene A) produces empty heads and free tails, whereas another (amber in gene D) produces partially filled heads in addition. Our data suggest that a DNA-petit lambda complex may be an early intermediate in packaging and that the lambda DNA substrate can be a cohesive-ended concatemer or a concatemer with double-stranded cohesive site sequences.

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Selected References

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