Abstract
Aminoacyl-tRNA synthetases aaRSs are responsible for the aminoacylation of tRNAs in the first step of protein synthesis. They comprise a group of enzymes that catalyze the formation of each possible aminoacyl-tRNA necessary for messenger RNA decoding in a cell. These enzymes have been divided into two classes according to structural features of their active sites and, although each class shares a common active site core, they present an assorted array of appended domains that makes them sufficiently diverse among the different living organisms. Here we will explore what is known about the diversity encountered among trypanosomatids’ aaRSs that has helped us not only to understand better the biology of these parasites but can be used rationally for the design of drugs against these protozoa.
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Abbreviations
- A:
-
Adenine
- aa-AMP:
-
aaRS, 4, 5 aminoacyl-adenylate complexed with aminoacyl-tRNA synthetase
- aaRS:
-
Aminoacyl-tRNA synthetase
- aa-tRNA:
-
Aminoacyl-tRNA
- AC1:
-
Anticodon binding motif
- AC2:
-
Anticodon binding motif
- AIDQ:
-
TrpRS and TyrRS motif present in the catalytic site (alanine, isoleucine, aspartate, glutamine)
- AlaRS:
-
Alanyl-tRNA synthetase
- AMP:
-
Adenosine-5′-monophosphate
- Arg:
-
Arginine
- ArgRS:
-
Arginyl-tRNA synthetase
- Asn:
-
Asparagine
- AsnRS:
-
Asparaginyl-tRNA synthetase
- Asp:
-
Aspartate
- AspRS:
-
Aspartyl-tRNA synthetase
- ATP:
-
Adenosine-5′-triphosphate
- AUA:
-
Isoleucine codon
- AUG:
-
Methionine codon
- C:
-
Cytosine
- CPK:
-
Coloring convention designed by Robert Corey and Linus Pauling, and improved by Walter Koltun.
- Cys:
-
Cysteine
- CysRS:
-
Cysteinyl-tRNA synthetase
- E:
-
Glutamate
- E. coli:
-
Escherichia coli
- eEFSec:
-
Selenocysteine elongation factor
- EMAP II-like domain:
-
Endothelial monocyte-activating polypeptide II-like domain
- ESE:
-
Eukaryotic specific extension present in Tryptophanyl-tRNA synthetases
- fmet:
-
Formylmethionine
- FTHF:
-
N10-formyltetrahydrofolate
- G:
-
Guanine
- GatCAB:
-
tRNA dependent amidotransferase of Archaea, bacteria and eukaryotic organelles
- GatDE:
-
Archaeal specific tRNA dependent amidotransferase
- GatFAB:
-
Yeast specific tRNA dependent amidotransferase
- GLDQ:
-
Trypanosomatid TyrRS motif present in the catalytic site (glycine, leucine, aspartate, glutamine)
- Gln:
-
Glutamine
- GlnRS:
-
Glutaminyl-tRNA synthetase
- Glu:
-
Glutamate
- GluRS:
-
Glutamyl-tRNA synthetase
- Gly:
-
Glycine
- GlyRS:
-
Glycyl-tRNA synthetase
- GTP:
-
Guanosine-5′-triphosphate
- GXDQ:
-
TrpRS motif present in bacteria (glycine, any amino acid, aspartate, glutamine)
- H:
-
Histidine
- HAM:
-
Histidyl-adenosinemonophosphate
- HARS1:
-
Human histidyl-tRNA synthetase 1
- HARS2:
-
Human histidyl-tRNA synthetase 2
- HIAQ:
-
Motif present in the active site of the trypanosomal tyrosyl-tRNA synthetase in place of motif
- HIGH:
-
(Histidine, isoleucine, alanine, glutamine)
- HIGH:
-
Motif presents in the active site of aaRS class I (histidine, isoleucine, glycine, histidine)
- His:
-
Histidine
- HisRS:
-
Histidyl-tRNA synthetase
- Ile:
-
Isoleucyl
- IleRS:
-
Isoleucyl-tRNA synthetase
- Kcat :
-
Catalytic constant
- Ki :
-
Dissociation constant for inhibitor binding
- KISKS:
-
Motif present in the active site of trypanosomatid methyl-tRNA synthetase (lysine, isoleucine, serine, lysine, serine)
- Km :
-
Michaelis Menten constant
- KMSKS:
-
Motif present in the active site of aminoacyl-tRNA synthetases class I (lysine, methionine, serine, lysine, serine)
- L30:
-
Ribosomal protein
- Leu:
-
Leucine
- LeuRS:
-
Leucyl-tRNA synthetase
- Lys:
-
Lysine
- LysRS:
-
Lysyl-tRNA synthetase
- MAMP:
-
Methionyl adenylate
- Met:
-
Methionine
- MetRS:
-
Methionyl-tRNA synthetase
- Mg+2 :
-
Magnesium ion
- mRNA:
-
Messenger ribonucleic acid
- MTF:
-
Methionyl-tRNA formyltransferase
- PDB:
-
Protein data bank
- Phe:
-
Phenylalanine
- PheRS:
-
Phenylalanyl-tRNA synthetase
- PLP:
-
Pyridoxal phosphate
- PPi :
-
Pyrophosphate
- Pro:
-
Proline
- ProRS:
-
Prolyl-tRNA synthetase
- PSTK:
-
O-phosphoseryl-tRNA kinase
- Pyl:
-
Pyrrolysine
- PylRS:
-
Pyrrolysyl-tRNA synthetase
- SBP2:
-
SECIS binding protein
- SCF:
-
Stem contact fold
- Sec:
-
Selenocysteine
- SECIS:
-
22, 23, 26, 27, 31, 40
- Sel1:
-
Kinetoplastid specific selenoprotein
- selA:
-
Selenocysteine synthase (bacterial)
- SelK:
-
Selenoprotein K
- SelT:
-
Selenoprotein T
- SelTryp:
-
Kinetoplastid specific selenoprotein
- Sep:
-
Phosphoserine
- SepRS:
-
Phosphoseryl-tRNA synthetase
- SepSecS:
-
O-phospho-L-seryl-tRNASec: L-selenocysteinyl-tRNA synthase
- Ser:
-
Serine
- SerRS:
-
Seryl-tRNA synthetase
- SPS2:
-
Selenophosphate synthase
- ThrRS:
-
Threonyl-tRNA synthetase
- Tpr:
-
Tryptophan
- tRNA:
-
Transfer ribonucleic acid
- tRNAfMet :
-
Formylmethionine tRNA isoacceptor
- tRNAMet-e :
-
Methionine elongator tRNA isoacceptor
- tRNAmet-i :
-
Methionine initiator tRNA isoacceptor
- TrpRS:
-
Tryptophanyl-tRNA synthetase
- Tyr:
-
Tyrosine
- TyrRS:
-
Tyrosine tRNA-synthetase
- U:
-
Uracyl
- UAA:
-
Termination codon (uracyl, adenine, adenine)
- UAG:
-
Termination codon (uracyl, adenine, guanine)
- UGA:
-
Termination codon (uracyl, guanine, adenine)
- V:
-
Valine
- Val:
-
Valine
- ValRS:
-
Valy-tRNA synthetase
- W:
-
Tryptophan
- WHEP:
-
Helix-turn-helix domain found in some aminoacyl-tRNA synthetasese
- Ψ:
-
Pseudouridine
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Acknowledgments
This work was supported by grants from FAPERJ, CNPq and WHO-TDR. I thank Dr. André Santos for inviting me to write this chapter and me deeply grateful to Dr. Shipra Srihari for editing the English. I also would like to express my gratitude to the invaluable contribution of the reviewers.
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Polycarpo, C. (2014). Highlights on Trypanosomatid Aminoacyl-tRNA Synthesis. In: Santos, A., Branquinha, M., d’Avila-Levy, C., Kneipp, L., Sodré, C. (eds) Proteins and Proteomics of Leishmania and Trypanosoma. Subcellular Biochemistry, vol 74. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7305-9_12
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