ライフサイエンスコーパス: tRNA(Met

1 ndrially encoded transfer RNA methionine (mt-tRNA(Met)).

2 ments including those derived from initiator-tRNA(Met).

3 s of tRNA(Leu(UUR)) as well as tRNA(Ala) and tRNA(Met).

4 at gives rise to the initiator and elongator tRNA(Met).

5 in vitro transcript of bovine mitochondrial tRNA(Met).

6 methionine by the one mitochondrial-encoded tRNA(Met).

7 s the Met surrogate azidonorleucine (Anl) to tRNA(Met).

8 slation at this AUG codon by using initiator tRNAmet.

9 terize the virus with a PBS complementary to tRNA(Met), a DNA fragment encompassing the PBS and U5 re

10 er mutants maintained a PBS complementary to tRNAMet after in vitro culture, although all contained m

11 adenylate formation but reduces the level of tRNA(Met) aminoacylation approximately 2-fold.

12 We report that RPUSD4 binds 16S mt-rRNA, mt-tRNA(Met), and mt-tRNA(Phe), and we demonstrate that it

13 U5 complementary to the anticodon region of tRNA(Met); and pHXB2(Met-C-Met), which contains two G-to

14 print) analysis with 30 S ribosoma subunits, tRNAMet, and a model segment of geneX-secA RNA carrying

15 dicted to disrupt complementarity within the tRNA(Met) anticodon region.

16 orm on a hybrid mRNA construct consisting of tRNA(Met) attached at the 5'-end of a mitochondrial prot

17 loop-containing tRNASer(UCN), tRNASer(AGN), tRNAMet(AUA), tRNATrp, and tRNAPro genes occur in M. cal

18 d cells involves the inhibition of initiator tRNA(Met) binding to eukaryotic translation initiation f

19 nslation initiation at the step of initiator tRNA(Met) binding to the ribosome.

20 the second maintained a PBS complementary to tRNA(Met) but contained a 26-nucleotide deletion in U5 u

21 Formylation of initiator methionyl-tRNA (Met-tRNA(Met)) by methionyl-tRNA formyltransferase (MTF) is

22 evisiae in the absence of eIF2 and initiator tRNA(met), by the same mechanism of factor-independent r

23 Defined in vitro analyses revealed that tRNA(Met(CAU)) and tRNA(Trp(CCA)) are substrates for Cm

24 er the amounts of ternary eIF2-GTP/initiator tRNA(met) complexes.

25 Here, we demonstrate that a modified tRNA(met)-derived (MTD) promoter effectively drives the

26 et) stably maintained a PBS complementary to tRNA(Met) during the 125-day culture period examined.

27 e-tRNA(Phe), an analog of the initiator fMet-tRNA(Met), enhanced the population of complexes that cou

28 ation was guanosine 37 in both mitochondrial tRNA(Met)(f) and tRNA(Phe).

29 interaction of IF3 relative to 16S rRNA and tRNA(Met)(f) in the 30S ribosomal subunit.

30 th a synthetic mitochondrial initiator tRNA (tRNA(Met)(f)).

31 h tRNAMet, maintained a PBS complementary to tRNAMet following in vitro culture.

32 is unique in using a single methionine tRNA (tRNA(Met)) for both initiation and elongation.

33 Uncharged tRNA and initiator Met-tRNAMet from wheat germ, RNAs that are normally excluded

34 alian mitochondrial genome contains a single tRNA(Met) gene that gives rise to the initiator and elon

35 usA operon, including the complete initiator tRNA(Met) gene, metY; a tRNA(Leu) gene; the tpiA gene pr

36 ase GCN2 or in cells that have two initiator tRNA(met) genes disrupted.

37 (T4409C) in the gene for human mitochondrial tRNA(Met) (hmtRNA(Met)) has been found to cause mitochon

38 n tRNA that is critical for the stability of tRNA(Met)i The crystal structure of the homotetrameric m

39 bility of the yeast m1A58 tRNA Mtase to bind tRNA(Met)i, indicating that each subunit contributes to

40 nspliced precursor RNAs of dimeric tRNA(Ser)-tRNA(Met)i, suggesting a novel nuclear role for RNase MR

41 ibosomal subunits, eIFs 3, 2, 1, and 1A, and tRNA(Met)(i) attach to the 5'-proximal region of mRNA an

42 In vivo, overexpression of eIF2 and tRNA(Met)(i) suppresses the temperature-sensitive phenot

43 fficient eIF2-independent recruitment of Met-tRNA(Met)(i) to 40S/mRNA complexes, if attachment of 40S

44 uitment of aminoacylated initiator tRNA (Met-tRNA(Met)(i)) by eukaryotic initiation factor eIF2.

45 eIF2 phosphorylation, despite requiring Met-tRNA(Met)(i).

46 cooperation with eIF3, eIF1, and eIF1A, Met-tRNA(Met)(i)/eIF2/GTP binds to 40S subunits yielding 43S

47 mino acid azidonorleucine (Anl) to elongator tRNA(Met) in hamster (CHO), monkey (COS7), and human (He

48 o suppresses the defect in nuclear export of tRNA(Met) in los1 cells.

49 Furthermore, tRNA(met)-independent initiation was also observed in tr

50 the U5-PBS structure and disrupt the U5-PBS-tRNAMet interaction of the virus derived from HXB2(Met-A

51 A portion of Met-tRNA(Met) is formylated for initiation, whereas the rema

52 ession did not diminish functional initiator tRNA(Met) levels.

53 compassing regions in U5 which interact with tRNAMet, maintained a PBS complementary to tRNAMet follo

54 n in vitro transcript of human mitochondrial tRNA(Met) (mtRNA(Met)) have been determined.

55 BS) viral RNA genome alone or complexed with tRNAMet of HXB2(Met-AC) revealed structural motifs in co

56 ographic behavior of elongator and initiator tRNAMet on a RPC-5 column indicated that both species ar

57 yl-tRNA analogues N-Ac-Phe-tRNAPhe, N-Ac-Met-tRNAMet or f-Met-tRNAfMet with puromycin, conditions fav

58 -tRNA, using either the native mitochondrial tRNA(Met) or an in vitro transcript of bovine mitochondr

59 ble than HIV-1 with the PBS complementary to tRNA(Met) or tRNA(His); however, all of these viruses ev

60 th pHXB2 except for the PBS complementary to tRNA(Met); pHXB2(Met-AC-Met), which contains the PBS seq

61 A novel HIV-1 mutant which stably utilizes tRNAMet rather than tRNA3Lys as a primer was previously

62 , we demonstrate that m(5)C deficiency in mt-tRNA(Met) results in the lack of 5-formylcytosine (f(5)C

63 ed to destabilize contact regions of U5 with tRNAMet, reverted back to contain a PBS complementary to

64 a PBS complementary to the 3' nucleotides of tRNA(Met); the PBS of this virus was not stable upon ext

65 We have used this fragmented P-site-bound tRNA(Met) to identify two 2'-hydroxyl groups at position

66 et, the ternary complex that joins initiator tRNA(Met) to the 43S preinitiation complex.

67 c protein that transfers methionyl-initiator tRNA(Met) to the small ribosomal subunit in a ternary co

68 Lys) as the primer, can be forced to utilize tRNA(Met), tRNA(1,2)(Lys), tRNA(His), or tRNA(Glu), alth

69 Compared to human tRNA gene promoters (tRNA(Met), tRNA(Val)), the human small nuclear RNA U6 ge

70 crimination against wheat germ initiator Met-tRNAMet was almost entirely due to the 2'-phosphoribosyl

71 f the first (1.72) base pair of tRNAGln, and tRNAMet was proposed by others to have a similar base-pa

72 as a whole, since some cytoplasmic RNAs like tRNA(Met) were vastly underrepresented, while U6 spliceo

73 t on processing or accumulation of elongator tRNAMet, which also contains m1A at position 58, suggest

74 the ribosome can translocate a P-site-bound tRNA(Met) with a break in the phosphodiester backbone be