Analysis of mercuric reductase (merA) gene diversity in an anaerobic mercury-contaminated sediment enrichment

Sinéad M. Ní Chadhain, Jeffra K. Schaefer, Sharron Crane, Gerben J. Zylstra, Tamar Barkay

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The reduction of ionic mercury to elemental mercury by the mercuric reductase (MerA) enzyme plays an important role in the biogeochemical cycling of mercury in contaminated environments by partitioning mercury to the atmosphere. This activity, common in aerobic environments, has rarely been examined in anoxic sediments where production of highly toxic methylmercury occurs. Novel degenerate PCR primers were developed which span the known diversity of merA genes in Gram-negative bacteria and amplify a 285 bp fragment at the 3′ end of merA. These primers were used to create a clone library and to analyse merA diversity in an anaerobic sediment enrichment collected from a mercury-contaminated site in the Meadowlands, New Jersey. A total of 174 sequences were analysed, representing 71 merA phylotypes and four novel MerA clades. This first examination of merA diversity in anoxic environments suggests an untapped resource for novel merA sequences.

Original languageEnglish (US)
Pages (from-to)1746-1752
Number of pages7
JournalEnvironmental Microbiology
Volume8
Issue number10
DOIs
StatePublished - Oct 2006

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

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