TY - JOUR
T1 - Regulation of mercury resistance in the crenarchaeote Sulfolobus solfataricus
AU - Schelert, James
AU - Drozda, Melissa
AU - Dixit, Vidula
AU - Dillman, Amanda
AU - Blum, Paul
PY - 2006/10
Y1 - 2006/10
N2 - Mercuric ion, Hg(II), inactivates generalized transcription in the crenarchaeote Sulfolobus solfataricus. Metal challenge simultaneously derepresses transcription of mercuric reductase (merA) by interacting with the archaeal transcription factor aMerR. Northern blot and primer extension analyses identified two additional Hg(II)-inducible S. solfataricus genes, merH and merI (SSO2690), located on either side of merA. Transcription initiating upstream of merH at promoter merHp was metal inducible and extended through mer A and merI, producing a merHAI transcript. Northern analysis of a merRA double mutant produced by linear DNA recombination demonstrated merHp promoter activity was dependent on aMerR to overcome Hg(II) transcriptional inhibition. Unexpectedly, in a merA disruption mutant, the merH transcript was transiently induced after an initial period of Hg(II)-mediated transcription inhibition, indicating continued Hg(II) detoxification. Metal challenge experiments using mutants created by markerless exchange verified the identity of the MerR binding site as an inverted repeat (IR) sequence overlapping the transcription factor B binding recognition element of merHp. The interaction of recombinant aMerR with merHp DNA, studied using electrophoretic mobility shift analysis, demonstrated that complex formation was template specific and dependent on the presence of the IR sequence but insensitive to Hg(II) addition and site-specific IR mutations that relieved in vivo merHp repression. Despite containing a motif resembling a distant ArsR homolog, these results indicate aMerR remains continuously DNA bound to protect and coordinate Hg(II)-responsive control over merHAI transcription. The new genetic methods developed in this work will promote experimental studies on S. solfataricus and other Crenarchaeota.
AB - Mercuric ion, Hg(II), inactivates generalized transcription in the crenarchaeote Sulfolobus solfataricus. Metal challenge simultaneously derepresses transcription of mercuric reductase (merA) by interacting with the archaeal transcription factor aMerR. Northern blot and primer extension analyses identified two additional Hg(II)-inducible S. solfataricus genes, merH and merI (SSO2690), located on either side of merA. Transcription initiating upstream of merH at promoter merHp was metal inducible and extended through mer A and merI, producing a merHAI transcript. Northern analysis of a merRA double mutant produced by linear DNA recombination demonstrated merHp promoter activity was dependent on aMerR to overcome Hg(II) transcriptional inhibition. Unexpectedly, in a merA disruption mutant, the merH transcript was transiently induced after an initial period of Hg(II)-mediated transcription inhibition, indicating continued Hg(II) detoxification. Metal challenge experiments using mutants created by markerless exchange verified the identity of the MerR binding site as an inverted repeat (IR) sequence overlapping the transcription factor B binding recognition element of merHp. The interaction of recombinant aMerR with merHp DNA, studied using electrophoretic mobility shift analysis, demonstrated that complex formation was template specific and dependent on the presence of the IR sequence but insensitive to Hg(II) addition and site-specific IR mutations that relieved in vivo merHp repression. Despite containing a motif resembling a distant ArsR homolog, these results indicate aMerR remains continuously DNA bound to protect and coordinate Hg(II)-responsive control over merHAI transcription. The new genetic methods developed in this work will promote experimental studies on S. solfataricus and other Crenarchaeota.
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U2 - 10.1128/JB.00558-06
DO - 10.1128/JB.00558-06
M3 - Article
C2 - 17015653
AN - SCOPUS:33749632751
SN - 0021-9193
VL - 188
SP - 7141
EP - 7150
JO - Journal of bacteriology
JF - Journal of bacteriology
IS - 20
ER -