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DNA packaging and cutting by phage terminases: Control in phage T4 by a synaptic mechanism

✍ Scribed by Lindsay W. Black

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 751 KB
Volume: 17
Category: Article
ISSN: 0265-9247
DOI: 10.1002/bies.950171206

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✦ Synopsis

Abstract

Phage DNA packaging occurs by DNA translocation into a prohead. Terminases are enzymes which initiate DNA packaging by cutting the DNA concatemer, and they are closely fitted structurally to the portal vertex of the prohead to form a ‘packasome’. Analysis among a number of phages supports an active role of the terminases in coupling ATP hydrolysis to DNA translocation through the portal. In phage T4 the small terminase subunit promotes a sequence‐specific terminase gene amplification within the chromosome. This link between recombination and packaging suggests a DNA synapsis mechanism by the terminase to control packaging initiation, formally homologous to eukaryotic chromosome segregation.

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