Retrograde nuclear transport from the cytoplasm is required for tRNA(Tyr) maturation in T-brucei

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F18%3A43897735" target="_blank" >RIV/60076658:12310/18:43897735 - isvavai.cz</a>

Result on the web

<a href="https://www.tandfonline.com/doi/abs/10.1080/15476286.2017.1377878?journalCode=krnb20" target="_blank" >https://www.tandfonline.com/doi/abs/10.1080/15476286.2017.1377878?journalCode=krnb20</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/15476286.2017.1377878" target="_blank" >10.1080/15476286.2017.1377878</a>

Result language

angličtina

Original language name

Retrograde nuclear transport from the cytoplasm is required for tRNA(Tyr) maturation in T-brucei

Original language description

Retrograde transport of tRNAs from the cytoplasm to the nucleus was first described in Saccharomyces cerevisiae and most recently in mammalian systems. Although the function of retrograde transport is not completely clear, it plays a role in the cellular response to changes in nutrient availability. Under low nutrient conditions tRNAs are sent from the cytoplasm to nucleus and presumably remain in storage there until nutrient levels improve. However, in S. cerevisiae tRNA retrograde transport is constitutive and occurs even when nutrient levels are adequate. Constitutive transport is important, at least, for the proper maturation of tRNA(Phe), which undergoes cytoplasmic splicing, but requires the action of a nuclear modification enzyme that only acts on a spliced tRNA. A lingering question in retrograde tRNA transport is whether it is relegated to S. cerevisiae and multicellular eukaryotes or alternatively, is a pathway with deeper evolutionary roots. In the early branching eukaryote Trypanosoma brucei, tRNA splicing, like in yeast, occurs in the cytoplasm. In the present report, we have used a combination of cell fractionation and molecular approaches that show the presence of significant amounts of spliced tRNA(Tyr) in the nucleus of T. brucei. Notably, the modification enzyme tRNA-guanine transglycosylase (TGT) localizes to the nucleus and, as shown here, is not able to add queuosine (Q) to an intron-containing tRNA. We suggest that retrograde transport is partly the result of the differential intracellular localization of the splicing machinery (cytoplasmic) and a modification enzyme, TGT (nuclear). These findings expand the evolutionary distribution of retrograde transport mechanisms to include early diverging eukaryotes, while highlighting its importance for queuosine biosynthesis.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10603 - Genetics and heredity (medical genetics to be 3)

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

RNA Biology

ISSN

1547-6286

e-ISSN

—

Volume of the periodical

15

Issue of the periodical within the volume

4-5

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

528-536

UT code for WoS article

000441672400012

EID of the result in the Scopus database

2-s2.0-85032834614