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(Received for publication, August 6, 1996, and in revised form, September 4, 1996)
From the Institut für Allgemeine Mikrobiologie,
Universität Kiel, Am Botanischen Garten 1-9, D-24118
Kiel, Federal Republic of Germany
We reported previously that cell-free
transcription in the Archaea Methanococcus and
Pyrococcus depends upon two archaeal transcription factors,
archaeal transcription factor A (aTFA) and archaeal transcription
factor B (aTFB). In the genome of Pyrococcus genes encoding
putative homologues of eucaryal transcription factors TATA-binding
protein (TBP) and TFIIB have been detected. Here, we report that
Escherichia coli synthesized Pyrococcus
homologues of TBP and TFIIB are able to replace endogenous aTFB and
aTFA in cell-free transcription reactions. Antibodies raised against archaeal TBP and TFIIB bind to polypeptides of identical molecular mass
in the aTFB and aTFA fraction. These data identify aTFB as archaeal TBP
and aTFA as the archaeal homologue of TFIIB. At the Pyrococcus
glutamate dehydrogenase (gdh) promoter these two
bacterially produced transcription factors and endogenous RNA
polymerase are sufficient to direct accurate and active initiation of
transcription. DNase I protection experiments revealed
Pyrococcus-TBP producing a characteristic footprint
between position
Volume 271, Number 47,
Issue of November 22, 1996
pp. 30144-30148
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
20 and
34 centered around the TATA box
of gdh promoter. Pyrococcus-TFIIB did not bind
to the TATA box but bound cooperatively with Pyrococcus-TBP generating an extended DNase I footprinting pattern ranging from position
19 to
42. These data suggest that the
Pyrococcus homologue of TFIIB associates with the
TBP-promoter binary complex as its eucaryal counterpart, but in
contrast to eucaryal TFIIB, it causes an extension of the protection to
the region upstream of the TATA box.
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