ELIZA

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267) Deletion analysis revealed a region within pqqA2 promoter inhibiting transcription.

--- 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.

--- ABSTRACT END ---

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(1)124 of	(12)7 is	(23)3 suggested	(34)2 method
(2)63 null	(13)6 with	(24)3 we	(35)2 no
(3)35 was	(14)5 based	(25)3 yielded	(36)2 patients
(4)22 and	(15)5 on	(26)2 (FEA)	(37)2 results
(5)21 showed	(16)5 were	(27)2 allele	(38)2 reveals
(6)19 revealed	(17)4 as	(28)2 because	(39)2 suggests
(7)10 in	(18)4 confirmed	(29)2 by	(40)2 that
(8)9 indicated	(19)4 demonstrated	(30)2 during	(41)2 tools
(9)8 the	(20)4 using	(31)2 found
(10)8 to	(21)3 identified	(32)2 further
(11)7 for	(22)3 shows	(33)2 has

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--- WordNet output for analysis --- =>詳細な検討, 分解, 分析, 解析, 見方, 精神分析 Overview of noun analysis The noun analysis has 6 senses (first 3 from tagged texts) 1. (45) analysis -- (an investigation of the component parts of a whole and their relations in making up the whole) 2. (5) analysis, analytic thinking -- (the abstract separation of a whole into its constituent parts in order to study the parts and their relations) 3. (2) analysis -- (a form of literary criticism in which the structure of a piece of writing is analyzed) 4. analysis -- (the use of closed-class words instead of inflections: e.g., `the father of the bride' instead of `the bride's father') 5. analysis -- (a branch of mathematics involving calculus and the theory of limits; sequences and series and integration and differentiation) 6. psychoanalysis, analysis, depth psychology -- (a set of techniques for exploring underlying motives and a method of treating various mental disorders; based on the theories of Sigmund Freud; "his physician recommended psychoanalysis") --- WordNet end ---