PMID- 17513594 OWN - NLM STAT- MEDLINE DCOM- 20071019 LR - 20181113 IS - 0099-2240 (Print) IS - 1098-5336 (Electronic) IS - 0099-2240 (Linking) VI - 73 IP - 16 DP - 2007 Aug TI - Diversity of nitrite reductase genes in "Candidatus Accumulibacter phosphatis"-dominated cultures enriched by flow-cytometric sorting. PG - 5331-7 AB - "Candidatus Accumulibacter phosphatis" is considered a polyphosphate-accumulating organism (PAO) though it has not been isolated yet. To reveal the denitrification ability of this organism, we first concentrated this organism by flow cytometric sorting following fluorescence in situ hybridization (FISH) using specific probes for this organism. The purity of the target cells was about 97% of total cell count in the sorted sample. The PCR amplification of the nitrite reductase genes (nirK and nirS) from unsorted and sorted cells was performed. Although nirK and nirS were amplified from unsorted cells, only nirS was detected from sorted cells, indicating that "Ca. Accumulibacter phosphatis" has nirS. Furthermore, nirS fragments were cloned from unsorted (Ba clone library) and sorted (Bd clone library) cells and classified by restriction fragment length polymorphism analysis. The most dominant clone in clone library Ba, which represented 62% of the total number of clones, was not found in clone library Bd. In contrast, the most dominant clone in clone library Bd, which represented 59% of the total number of clones, represented only 2% of the total number of clones in clone library Ba, indicating that this clone could be that of "Ca. Accumulibacter phosphatis." The sequence of this nirS clone exhibited less than 90% similarity to the sequences of known denitrifying bacteria in the database. The recovery of the nirS genes makes it likely that "Ca. Accumulibacter phosphatis" behaves as a denitrifying PAO capable of utilizing nitrite instead of oxygen as an electron acceptor for phosphorus uptake. FAU - Miyauchi, Ryuki AU - Miyauchi R AD - Department of Chemical Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan. FAU - Oki, Kazuma AU - Oki K FAU - Aoi, Yoshiteru AU - Aoi Y FAU - Tsuneda, Satoshi AU - Tsuneda S LA - eng SI - GENBANK/AB208081 SI - GENBANK/AB208082 SI - GENBANK/AB208083 SI - GENBANK/AB208084 SI - GENBANK/AB208085 SI - GENBANK/AB208086 SI - GENBANK/AB208087 SI - GENBANK/AB208088 SI - GENBANK/AB208089 SI - GENBANK/AB208090 SI - GENBANK/AB208091 SI - GENBANK/AB208092 SI - GENBANK/AB208093 SI - GENBANK/AB208094 SI - GENBANK/AB208095 SI - GENBANK/AB208096 SI - GENBANK/AB208097 SI - GENBANK/AB208098 SI - GENBANK/AB208099 SI - GENBANK/AB208100 SI - GENBANK/AB208101 SI - GENBANK/AB208102 SI - GENBANK/AB208103 SI - GENBANK/AB208104 SI - GENBANK/AB208105 PT - Journal Article DEP - 20070518 PL - United States TA - Appl Environ Microbiol JT - Applied and environmental microbiology JID - 7605801 RN - 0 (Bacterial Proteins) RN - 0 (DNA, Bacterial) RN - EC 1.7.- (Nitrite Reductases) SB - IM MH - Bacteria/classification/enzymology/*genetics MH - Bacterial Proteins/*genetics MH - Bioreactors/microbiology MH - DNA, Bacterial/chemistry/genetics/isolation & purification MH - Flow Cytometry/*methods MH - In Situ Hybridization, Fluorescence/methods MH - Molecular Sequence Data MH - Nitrite Reductases/*genetics MH - Phylogeny MH - Polymerase Chain Reaction MH - Polymorphism, Restriction Fragment Length MH - Sequence Analysis, DNA PMC - PMC1950991 EDAT- 2007/05/22 09:00 MHDA- 2007/10/20 09:00 PMCR- 2007/12/01 CRDT- 2007/05/22 09:00 PHST- 2007/05/22 09:00 [pubmed] PHST- 2007/10/20 09:00 [medline] PHST- 2007/05/22 09:00 [entrez] PHST- 2007/12/01 00:00 [pmc-release] AID - AEM.00175-07 [pii] AID - 0175-07 [pii] AID - 10.1128/AEM.00175-07 [doi] PST - ppublish SO - Appl Environ Microbiol. 2007 Aug;73(16):5331-7. doi: 10.1128/AEM.00175-07. Epub 2007 May 18.