Instability of bacteriophage lambda initiator O and P proteins in DNA replication.

Abstract:

:Lambda dv plasmids having an amber mutation in an initiator gene, O or P, were constructed from mutant lambda phages by recombinant DNA techniques and several properties of such derivatives were investigated. These plasmids are perpetuated in suppressor-plus (amber-permissive) cells, but not in non-suppressor cells. The plasmid copy number in the suppressor-plus cells was low as compared to that of the plasmid without the amber mutation. In cells carrying a thermosensitive suppressor 2, raising the temperature is expected to block new production of amber proteins, but should not affect conservation of the protein made prior to heating. It was observed, however, that replication of the plasmids carrying an amber mutation in the O or P gene was abolished soon after raising the temperature, suggesting that neither of the initiator proteins can continue functioning unless replenished. Pulse-chase experiments demonstrated that O protein decays with a half-life of 8 min. Several lines of evidence suggest that this degradation occurs independently of the protein function. On the other hand, P protein was not degraded under the same experimental conditions. These observations are discussed in connection with functional instability of the initiator molecules. It appears that they do not work catalytically.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Miwa T,Akaboshi E,Matsubara K

doi

10.1093/oxfordjournals.jbchem.a134360

subject

Has Abstract

pub_date

1983-08-01 00:00:00

pages

331-8

issue

2

eissn

0021-924X

issn

1756-2651

journal_volume

94

pub_type

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