ライフサイエンスコーパス: queuine

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1 NAs in their anticodon wobble positions with queuine.

2 bble position with the deazaguanine analogue queuine.

3 The modified RNA base queuine [7-(4,5-cis-dihydroxy-1-cyclopenten-3-ylaminomet

4 Val161, evolved for increased recognition of queuine and a concomitantly decreased recognition of pre

5 ified bases such as deazaguanines related to queuine and archaeosine, pyrimidines comparable with lys

6 vely made by bacteria, and the corresponding queuine base is a micronutrient salvaged by eukaryotic s

7 Excess exogenous queuine can cause repletion of tRNA queuine levels in Ra

8 a UGU sequence in the anticodon loop of the queuine-cognate tRNAs.

9 RasC4 cells are hypomodified for queuine compared with C3H cells, despite increase tRNA-g

10 levels were stimulated by growth of cells in queuine-containing medium; in vitro Pmt1 activity was en

11 maintaining the anticodon identities of the queuine-containing tRNAs and suggests that TGT mutants c

12 rowth in horse serum, which contains no free queuine, eliminates Q from the cellular tRNA population

13 lines may be useful systems for the study of queuine function in normal cells and the causes and cons

14 ither on horse serum or calf serum with free queuine had no effect on frameshifting either.

15 cation in normal cells and the mechanisms of queuine hypomodification in tumors are unknown.

16 4) with respect to the causes and effects of queuine hypomodification.

17 st-transcriptional modification of tRNA with queuine in Escherichia coli is the exchange of the queui

18 n 34 of tRNA(Y,H,N,D) with the modified base queuine in eukaryotes or its precursor, preQ(1) base, in

19 ses and consequences of hypomodification for queuine in tumors.

20 ed by the absence of the enzyme that inserts queuine into tRNA, eukaryotic tRNA-guanine transglycosyl

21 Notably, queuine is a micronutrient that is scavenged by higher e

22 xogenous queuine can cause repletion of tRNA queuine levels in RasC4 cells.

23 The molecular role of queuine modification in normal cells and the mechanisms

24 Queuine modification is defective in many tumors and tra

25 Queuine modification of both C3H and RasC4 cells can be

26 ermediate, but mammals import the free base, queuine, obtained from the diet or the intestinal flora.

27 ognize the guanine in tRNA and the free base queuine or preQ(1) to catalyze this exchange.

28 sglycosylase (TGT) catalyzes the exchange of queuine (or a precursor) for guanine 34 in tRNA.

29 e in Escherichia coli is the exchange of the queuine precursor, preQ1 into tRNA.

30 ynthesize Q by the base-for-base exchange of queuine (Q base) for guanine in the unmodified tRNA, a r

31 ed in the incorporation of the modified base queuine (Q) into the wobble position of certain tRNAs.

32 ed in the incorporation of the modified base queuine [Q, 7-(4,5-cis-dihydroxy-2-cyclopenten-1-ylamino

33 tivity was enhanced on Q-containing RNA; and queuine-stimulated in vivo methylation was abrogated by

34 ription elongation factor (GreA), a possible queuine synthesis protein, and a possible chemotaxis pro

35 ubacterial TGTs to recognize preQ(1) but not queuine, whereas the eukaryal equivalent, Val161, evolve

36 ter reflect bioavailability of the precursor queuine, which eukaryotes scavenge from the tRNAs of bac

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