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Volume 150, Issue 3

Characterization of a new internal promoter (P) for hydrogenase accessory genes Free

Abstract

Synthesis of the [NiFe] hydrogenase requires the participation of 16 accessory genes () besides the genes encoding the structural proteins (). Transcription of is controlled by a −24/−12-type promoter (P), located upstream of and regulated by NifA. In this work, a second −24/−12-type promoter (P), located upstream of the gene and transcribing genes in pea ( L.) bacteroids, has been identified in the gene cluster. Promoter P was also active in free-living cells, as evidenced by genetic complementation of hydrogenase mutants. Both NifA and NtrC activated P expression in the heterologous host . Also, P activity was highly stimulated by NifA in . This NifA activation of P expression only required the -binding site, and it was independent of any -acting element upstream of the box, which suggests a direct interaction of free NifA with the RNA polymerase holoenzyme. P-dependent expression in pea nodules started in interzone II/III, spanned through nitrogen-fixing zone III, and was coincident with the NifA-dependent expression pattern. However, P was dispensable for transcription and hydrogenase activity in pea bacteroids due to transcription initiated at P. This fact and the lack of an activator recruitment system suggest that P plays a secondary role in symbiotic expression.

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): IHF, integration host factor and UAS, upstream activating sequence
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2004-03-01
2022-08-14
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Characterization of a new internal promoter (P3) for Rhizobium leguminosarum hydrogenase accessory genes hupGHIJ
Microbiology 150, 665 (2004); https://doi.org/10.1099/mic.0.26623-0
/content/journal/micro/10.1099/mic.0.26623-0
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