ELIZA

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271290 occurrences (No.96 in the rank) during 5 years in the PubMed. [no cache] 500 found

491) The results not only imply there exist negative transcriptional regulators for pqqA2 but also provide us a new approach to achieve higher PQQ production by deleting the target binding sequence.

--- ABSTRACT ---

PMID:23828377 DOI:10.1002/jobm.201300037

2015 Journal of basic microbiology

* Multiple pqqA genes respond differently to environment and one contributes dominantly to pyrroloquinoline quinone synthesis.

- Pyrroloquinoline quinone is the third redox cofactor after nicotinamide and flavin in bacteria, and its biosynthesis pathway comprise five steps initiated from a precursor peptide PqqA coded by pqqA gene. Methylovorus sp. MP688 is equipped with five copies of pqqA genes. Herein, the transcription of pqqA genes under different conditions by real-time quantitative PCR and β-galactosidase reporter genes are reported. Multiple pqqA genes were proved to play significant roles and contribute differently in PQQ synthesis. pqqA1, pqqA2, and pqqA4 were determined to be dominantly transcribed over the others, and correspondingly absence of any of the three genes caused a decrease in PQQ synthesis. Notably, pqqA was up-regulated in low pH and limited oxygen environment, and it is pqqA2 promoter that could be induced when bacteria were transferred from pH 7.0 to pH 5.5. Deletion analysis revealed a region within pqqA2 promoter inhibiting transcription. PQQ concentration was increased by overexpression of pqq genes under control of truncated pqqA2 promoter. The results not only imply there exist negative transcriptional regulators for pqqA2 but also provide us a new approach to achieve higher PQQ production by deleting the target binding sequence.

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(1)138 was	(4)83 are	(7)4 null	(10)2 appears
(2)132 is	(5)20 have	(8)3 exists	(11)2 exist
(3)86 were	(6)18 has	(9)3 may

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--- WordNet output for there --- =>1.その場所で, そこに(で), そこへ, 2.〜がある, その場所で Overview of noun there The noun there has 1 sense (no senses from tagged texts) 1. there -- (a location other than here; that place; "you can take it from there") Overview of adv there The adv there has 3 senses (first 3 from tagged texts) 1. (181) there, at that place, in that location -- (in or at that place; "they have lived there for years"; "it's not there"; "that man there") 2. (6) there, in that respect, on that point -- (in that matter; "I agree with you there") 3. (2) there, thither -- (to or toward that place; away from the speaker; "go there around noon!") --- WordNet end ---