TRNA-dihydrouridine16/17 synthase (NAD(P)+)

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TRNA-dihydrouridine16/17 synthase (NAD(P)+)
Identifiers
EC no. 1.3.1.88
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NCBI proteins

TRNA-dihydrouridine16/17 synthase (NAD(P)+) (EC 1.3.1.88, Dus1p, tRNA-dihydrouridine synthase 1) is an enzyme with systematic name tRNA-5,6-dihydrouracil16/17:NAD(P)+ oxidoreductase. [1] [2] This enzyme catalyses the following chemical reaction

(1) 5,6-dihydrouracil16 in tRNA + NAD(P)+ uracil16 in tRNA + NAD(P)H + H+
(2) 5,6-dihydrouracil17 in tRNA + NAD(P)+ uracil17 in tRNA + NAD(P)H + H+

This enzyme specifically modifies uracil16 and uracil17 in tRNA.

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tRNA-dihydrouridine synthase

In molecular biology, tRNA-dihydrouridine synthase is a family of enzymes which catalyse the reduction of the 5,6-double bond of a uridine residue on tRNA. Dihydrouridine modification of tRNA is widely observed in prokaryotes and eukaryotes, and also in some archaea. Most dihydrouridines are found in the D loop of t-RNAs. The role of dihydrouridine in tRNA is currently unknown, but may increase conformational flexibility of the tRNA. It is likely that different family members have different substrate specificities, which may overlap. Dus 1 from Saccharomyces cerevisiae acts on pre-tRNA-Phe, while Dus 2 acts on pre-tRNA-Tyr and pre-tRNA-Leu. Dus 1 is active as a single subunit, requiring NADPH or NADH, and is stimulated by the presence of FAD. Some family members may be targeted to the mitochondria and even have a role in mitochondria.

TRNA-dihydrouridine47 synthase (NAD(P)+) (EC 1.3.1.89, Dus3p, tRNA-dihydrouridine synthase 3) is an enzyme with systematic name tRNA-5,6-dihydrouracil47:NAD(P)+ oxidoreductase. This enzyme catalyses the following chemical reaction

TRNA-dihydrouridine20a/20b synthase (NAD(P)+) (EC 1.3.1.90, Dus4p) is an enzyme with systematic name tRNA-5,6-dihydrouracil20a/20b:NAD(P)+ oxidoreductase. This enzyme catalyses the following chemical reaction

TRNA-dihydrouridine20 synthase (NAD(P)+) (EC 1.3.1.91, Dus2p, tRNA-dihydrouridine synthase 2) is an enzyme with systematic name tRNA-5,6-dihydrouracil20:NAD(P)+ oxidoreductase. This enzyme catalyses the following chemical reaction

5,6-dimethylbenzimidazole synthase (EC 1.14.99.40, BluB) is an enzyme with systematic name FMNH2 oxidoreductase (5,6-dimethylbenzimidazole forming). This enzyme catalyses the following chemical reaction

TRNA (guanine9-N1)-methyltransferase (EC 2.1.1.221, Trm10p, tRNA(m1G9/m1A9)-methyltransferase, tRNA(m1G9/m1A9)MTase, tRNA (guanine-N(1)-)-methyltransferase, tRNA m1G9-methyltransferase, tRNA m1G9 MTase) is an enzyme with systematic name S-adenosyl-L-methionine:tRNA (guanine9-N1)-methyltransferase. This enzyme catalyses the following chemical reaction

TRNA:m4X modification enzyme is an enzyme with systematic name S-adenosyl-L-methionine:tRNAPro/His/Gly(GCC) (cytidine/adenosine4-2'-O)-methyltransferase. This enzyme catalyses the following chemical reaction

TRNA (pseudouridine54-N1)-methyltransferase (EC 2.1.1.257, TrmY, m1Psi methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:tRNA (pseudouridine54-N1)-methyltransferase. This enzyme catalyses the following chemical reaction

Deoxyhypusine synthase (EC 2.5.1.46, spermidine:eIF5A-lysine 4-aminobutyltransferase (propane-1,3-diamine-forming)) is an enzyme with systematic name (eIF5A-precursor)-lysine:spermidine 4-aminobutyltransferase (propane-1,3-diamine-forming). This enzyme catalyses the following chemical reaction

tRNA(His) guanylyltransferase is an enzyme with systematic name p-tRNA(His):GTP guanylyltransferase (ATP-hydrolysing). This enzyme catalyses the following chemical reaction

tRNA pseudouridine55 synthase is an enzyme with systematic name tRNA-uridine55 uracil mutase. This enzyme catalyses the following chemical reaction

tRNA pseudouridine13 synthase is an enzyme with systematic name tRNA-uridine13 uracil mutase. This enzyme catalyses the following chemical reaction

tRNA pseudouridine32 synthase is an enzyme with systematic name tRNA-uridine32 uracil mutase. This enzyme catalyses the following chemical reaction

tRNA pseudouridine31 synthase is an enzyme with systematic name tRNA-uridine31 uracil mutase. This enzyme catalyses the following chemical reaction

Mitochondrial tRNA pseudouridine27/28 synthase is an enzyme with systematic name mitochondrial tRNA-uridine27/28 uracil mutase. This enzyme catalyses the following chemical reaction

tRNA pseudouridine38/39 synthase is an enzyme with systematic name tRNA-uridine38/39 uracil mutase. This enzyme catalyses the following chemical reaction

References

  1. ↑ Xing F, Hiley SL, Hughes TR, Phizicky EM (April 2004). "The specificities of four yeast dihydrouridine synthases for cytoplasmic tRNAs". The Journal of Biological Chemistry. 279 (17): 17850–60. doi: 10.1074/jbc.M401221200 . PMID   14970222.
  2. ↑ Xing F, Martzen MR, Phizicky EM (March 2002). "A conserved family of Saccharomyces cerevisiae synthases effects dihydrouridine modification of tRNA". RNA. 8 (3): 370–81. doi:10.1017/S1355838202029825. PMC   1370258 . PMID   12003496.
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