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318584 occurrences (No.68 in the rank) during 5 years in the PubMed. [no cache] 500 found

257) 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.

--- 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)21 and	(18)4 or	(35)2 Chilean	(52)2 energy
(2)19 laser	(19)4 socioeconomic	(36)2 HLB	(53)2 families
(3)11 doses	(20)3 Er:YAG	(37)2 OAs	(54)2 genetic
(4)11 levels	(21)3 O2	(38)2 acculturation	(55)2 group
(5)10 null	(22)3 PFR	(39)2 activities	(56)2 maternal
(6)10 cost	(23)3 PbB	(40)2 activity	(57)2 method
(7)10 lipoprotein	(24)3 STT	(41)2 after	(58)2 molecular
(8)8 back	(25)3 concentrations	(42)2 areas	(59)2 oral
(9)8 birth	(26)3 educational	(43)2 at	(60)2 pH
(10)8 dose	(27)3 features	(44)2 bioavailability	(61)2 peer
(11)7 in	(28)3 risk	(45)2 body	(62)2 population
(12)7 level	(29)3 serum	(46)2 cancer	(63)2 radiation
(13)6 birthweight	(30)3 shear	(47)2 children	(64)2 resilience
(14)5 but	(31)3 tumours	(48)2 coverage	(65)2 running
(15)4 as	(32)3 vagal	(49)2 degree	(66)2 sensitivity
(16)4 carbon	(33)3 water	(50)2 density	(67)2 settings
(17)4 income	(34)3 whole-body	(51)2 education	(68)2 temperature

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--- WordNet output for low --- =>安い, 低いところ, 卑劣に, 粗食で, 低い(もの), 弱い, 粗末な, 乏しい, 衿ぐりが深い, 建物の低い, 下劣な, 低級な Overview of noun low The noun low has 4 senses (no senses from tagged texts) 1. low, depression -- (an air mass of lower pressure; often brings precipitation; "a low moved in over night bringing sleet and snow") 2. Low, David Low, Sir David Low, Sir David Alexander Cecil Low -- (British political cartoonist (born in New Zealand) who created the character Colonel Blimp (1891-1963)) 3. low -- (a low level or position or degree; "the stock market fell to a new low") 4. first gear, first, low gear, low -- (the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving) Overview of verb low The verb low has 1 sense (no senses from tagged texts) 1. moo, low -- (make a low noise, characteristic of bovines) Overview of adj low The adj low has 10 senses (first 6 from tagged texts) 1. (55) low -- (less than normal in degree or intensity or amount; "low prices"; "the reservoir is low") 2. (23) low -- (literal meanings; being at or having a relatively small elevation or upward extension; "low ceilings"; "low clouds"; "low hills"; "the sun is low"; "low furniture"; "a low bow") 3. (11) low, low-toned -- (very low in volume; "a low murmur"; "the low-toned murmur of the surf") 4. (6) low -- (unrefined in character; "low comedy") 5. (4) low, low-pitched -- (used of sounds and voices; low in pitch or frequency) 6. (3) abject, low, low-down, miserable, scummy, scurvy -- (of the most contemptible kind; "abject cowardice"; "a low stunt to pull"; "a low-down sneak"; "his miserable treatment of his family"; "You miserable skunk!"; "a scummy rabble"; "a scurvy trick") 7. humble, low, lowly, modest, small -- (low or inferior in station or quality; "a humble cottage"; "a lowly parish priest"; "a modest man of the people"; "small beginnings") 8. depleted, low -- (no longer sufficient; "supplies are low"; "our funds are depleted") 9. broken, crushed, humbled, humiliated, low -- (subdued or brought low in condition or status; "brought low"; "a broken man"; "his broken spirit") 10. gloomy, grim, blue, depressed, dispirited, down, downcast, downhearted, down in the mouth, low, low-spirited -- (filled with melancholy and despondency ; "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"; "took a grim view of the economy"; "the darkening mood"; "lonely and blue in a strange city"; "depressed by the loss of his job"; "a dispirited and resigned expression on her face"; "downcast after his defeat"; "feeling discouraged and downhearted") Overview of adv low The adv low has 1 sense (first 1 from tagged texts) 1. (3) low -- (in a low position; near the ground; "the branches hung low") --- WordNet end ---