Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication.

Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication. Research Abstract Details 

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Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication. Abstract Text:

Wanfeng Yu,Anna McCulley,Casey D Morrow,

BACKGROUND: Human immunodeficiency virus (HIV-1) exclusively selects and utilizes tRNALys,3 as the primer for initiation of reverse transcription. Several elements within the TPsiC stem loop of tRNALys,3 are postulated to be important for selection and use in reverse transcription. The post-transcriptional modification at nucleotide 58 could play a role during plus-strand synthesis to stop reverse transcriptase from re-copying the tRNA primer. Nucleotides 53 and 54 within the TPsiC stem loop of the tRNA have been shown to be important to form the complex between tRNA and the HIV-1 viral genome during initiation of reverse transcription. RESULTS: To further delineate the features of the TPsiC stem loop of tRNALys,3 in reverse transcription, we have developed a complementation system in which E. coli tRNALys,3 is provided in trans to an HIV-1 genome in which the PBS is complementary to this tRNA. Successful selection and use of E. coli tRNALys,3 results in the production of infectious virus. We have used this single round infectious system to ascertain the effects that different mutants in the TPsiC stem loop of tRNALys,3 have on complementation. Mutants were designed within the TPsiC loop (nucleotide 58) and within the stem and loop of the TPsiC loop (nucleotides 53 and 54). Analysis of the expression of E. coli tRNALys,3 mutants revealed differences in the capacity for aminoacylation, which is an indication of intracellular stability of the tRNA. Alteration of nucleotide 58 from A to U (A58U), T54G and TG5453CC all resulted in tRNALys,3 that was aminoacylated when expressed in cells, while a T54C mutation resulted in a tRNALys,3 that was not aminoacylated. Both the A58U and T54G mutated tRNALys,3 complemented HIV-1 replication similar to wild type E. coli tRNALys,3. In contrast, the TG5453CC tRNALys,3 mutant did not complement replication. CONCLUSION: The results demonstrate that post-transcriptional modification of nucleotide 58 in tRNALys,3 is not essential for HIV-1 reverse transcription. In contrast, nucleotides 53 and 54 of tRNALys,3 are important for aminoacylation and selection and use of the tRNALys,3 in reverse transcription.

Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication. Publishing Authors By Initials

W Yu,A McCulley,CD Morrow,

For similar biological phenomena, cell phenomena, and immunity: biological phenomena: microbiologic phenomena: viral physiology: virus replication research abstracts see: biological phenomena, cell phenomena, and immunity: biological phenomena: microbiologic phenomena: viral physiology: virus replication research

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Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Virology journal

VOLUME: 4

Page Numbers: 5

Journal Abbreviation: Virol. J.

ISSN: 1743-422X

DAY: 11

MONTH: 01

YEAR: 2007

Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101231645

Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication. Keywords Mesh Terms:

KEYWORDS: Virus Replication

MESH TERMS: genetics

Chemical & Substance for Abstract: Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication. Information

Substance Name: tRNA, lysine-

Registry Number: 0

Grant and Affiliation Information for Mutations in the TPsiC loop of E. coli tRNALys,3 have varied effects on in trans complementation of HIV-1 replication.

AFFILIATION: Department of Cell Biology, University of Alabama at Birmingham, Birmingham, AL 35294-0024, USA. wanfengy@uab.edu

Country: England

AGENCY: United States NIAID

GRANT: AI34749

ACRONYM: AI

MEDLINETA: Virol J

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