Immunodetection and N-terminal sequencing of DNA replication proteins of bacteriophage BFK20 - lytic phage of Brevibacterium flavum.

Abstract:

:Phages are excellent models for studying the mechanism of DNA replication in prokaryotes. Identification of phage proteins involved in phage DNA replication is the first prerequisite for elucidation of the phage replication module. We focused on replication proteins gp41 (a putative helicase from SF2 superfamily), gp43 (a RepA-like protein), and gp44 (a putative DNA polymerase A) of phage BFK20 grown in Brevibacterium flavum. To identify them in the phage-host system, we prepared antibodies to these proteins which were cloned and expressed in Escherichia coli as his-tagged recombinant proteins. After purification to homogeneity the recombinant proteins served for raising specific polyclonal antibodies in mice. Using these antibodies in Western blot analysis the phage proteins gp41, gp43 and gp44 were detected during the phage growth cycle. The proteins gp41 and gp43, prepared from cell lysate by ammonium sulphate precipitation, were N-terminally sequenced and found to contain the sequences N-SVKPRELR-C and N-MLGSTML-C, respectively. This means that gp41 starts with serine but not with common methionine. We consider these findings an initial but important step towards more thorough characterization of replication proteins of phage BFK20.

journal_name

Acta Virol

journal_title

Acta virologica

authors

Bukovská G,Halgašová N,Hromadová L,Koščová H,Bukovský M

doi

10.4149/av_2014_02_152

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

152-9

issue

2

eissn

0001-723X

issn

1336-2305

journal_volume

58

pub_type

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