ELIZA

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357929 occurrences (No.51 in the rank) during 5 years in the PubMed. [no cache] 500 found

305) Herein, the transcription of pqqA genes under different conditions by real-time quantitative PCR and β-galactosidase reporter genes are reported.

--- 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)48 null	(14)6 periods	(27)3 frames	(40)2 needed
(2)40 of	(15)5 frame	(28)3 on	(41)2 parameters
(3)34 and	(16)5 from	(29)3 quantitative	(42)2 pressure
(4)34 to	(17)5 period	(30)3 since	(43)2 required
(5)14 in	(18)5 physical	(31)3 taken	(44)2 spacing
(6)12 PCR	(19)5 the	(32)2 1	(45)2 spent
(7)11 was	(20)4 a	(33)2 1)	(46)2 targets
(8)10 points	(21)4 by	(34)2 PCR,	(47)2 test
(9)9 for	(22)4 or	(35)2 data	(48)2 that
(10)8 course	(23)4 reverse	(36)2 even	(49)2 use
(11)8 polymerase	(24)4 series	(37)2 interval	(50)2 used
(12)6 RT-PCR	(25)3 aerobic	(38)2 it	(51)2 will
(13)6 manner	(26)3 consuming	(39)2 maintain

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--- WordNet output for time --- =>1.時代, 季節, 歳月, 当時, 現代, 一生, 年季, 就業時間, 期間, 時刻, 時点, 機会, 拍子, 速度, 何度, 何回, 時, 時間, 回, 2.時間[速度]を測定する, 時間を決める, (装置などの)タイミングを調節する Overview of noun time The noun time has 10 senses (first 9 from tagged texts) 1. (219) time, clip -- (an instance or single occasion for some event; "this time he succeeded"; "he called four times"; "he could do ten at a clip") 2. (160) time -- (a period of time considered as a resource under your control and sufficient to accomplish something; "take time to smell the roses"; "I didn't have time to finish"; "it took more than half my time") 3. (114) time -- (an indefinite period (usually marked by specific attributes or activities); "he waited a long time"; "the time of year for planting"; "he was a great actor in his time") 4. (43) time -- (a suitable moment; "it is time to go") 5. (36) time -- (the continuum of experience in which events pass from the future through the present to the past) 6. (10) time -- (a person's experience on a particular occasion; "he had a time holding back the tears"; "they had a good time together") 7. (7) clock time, time -- (a reading of a point in time as given by a clock; "do you know what time it is?"; "the time is 10 o'clock") 8. (5) fourth dimension, time -- (the fourth coordinate that is required (along with three spatial dimensions) to specify a physical event) 9. (1) meter, metre, time -- (rhythm as given by division into parts of equal duration) 10. prison term, sentence, time -- (the period of time a prisoner is imprisoned; "he served a prison term of 15 months"; "his sentence was 5 to 10 years"; "he is doing time in the county jail") Overview of verb time The verb time has 5 senses (first 3 from tagged texts) 1. (4) clock, time -- (measure the time or duration of an event or action or the person who performs an action in a certain period of time; "he clocked the runners") 2. (3) time -- (assign a time for an activity or event; "The candidate carefully timed his appearance at the disaster scene") 3. (1) time -- (set the speed, duration, or execution of; "we time the process to manufacture our cars very precisely") 4. time -- (regulate or set the time of; "time the clock") 5. time -- (adjust so that a force is applied and an action occurs at the desired time; "The good player times his swing so as to hit the ball squarely") --- WordNet end ---