Linked Life Data

17541778

Source:http://linkedlifedata.com/resource/pubmed/id/17541778

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2007-9-17
pubmed:abstractText
Metabolism of ammonia (NH(3)) and hydroxylamine (NH(2)OH) by wild-type and a nitrite reductase (nirK) deficient mutant of Nitrosomonas europaea was investigated to clarify the role of NirK in the NH(3) oxidation pathway. NirK-deficient N. europaea grew more slowly, consumed less NH(3), had a lower rate of nitrite (NO(2) (-)) production, and a significantly higher rate of nitrous oxide (N(2)O) production than the wild-type when incubated with NH(3) under high O(2) tension. In incubations with NH(3) under low O(2) tension, NirK-deficient N. europaea grew more slowly, but had only modest differences in NH(3) oxidation and product formation rates relative to the wild-type. In contrast, the nirK mutant oxidized NH(2)OH to NO(2) (-) at consistently slower rates than the wild-type, especially under low O(2) tension, and lost a significant pool of NH(2)OH-N to products other than NO(2) (-) and N(2)O. The rate of N(2)O production by the nirK mutant was ca. three times higher than the wild-type during hydrazine-dependent NO(2) (-) reduction under both high and low O(2) tension. Together, the results indicate that NirK activity supports growth of N. europaea by supporting the oxidation of NH(3) to NO(2) (-) via NH(2)OH, and stimulation of hydrazine-dependent NO(2) (-) reduction by NirK-deficient N. europaea indicated the presence of an alternative, enzymatic pathway for N(2)O production.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0302-8933
pubmed:author
pubmed:issnType
Print
pubmed:volume
188
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
349-54
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Role of nitrite reductase in the ammonia-oxidizing pathway of Nitrosomonas europaea.
pubmed:affiliation
Department of Environmental Sciences, Geology 2207, University of California, Riverside, CA 92521, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't