The University of Southampton
University of Southampton Institutional Repository

ABC50 promotes translation initiation in mammalian cells

ABC50 promotes translation initiation in mammalian cells
ABC50 promotes translation initiation in mammalian cells
ABC50 is an ATP-binding cassette (ABC) protein, which, unlike most ABC proteins, does not possess membrane-spanning domains. ABC50 interacts with eukaryotic initiation factor 2 (eIF2), which plays a key role in translation initiation and its control. ABC50 binds to ribosomes, and this interaction requires both the N-terminal domain and at least one ABC domain. Knockdown of ABC50 by RNA interference impaired translation of both cap-dependent and -independent reporters, consistent with a positive role for ABC50 in the function of eIF2, which is required for both types of translation initiation. Mutation of the Walker box A or B motifs in both ABC regions of ABC50 yielded a mutant protein that exerted a dominant-interfering phenotype with respect to protein synthesis and translation initiation. Importantly, although dominant-interfering mutants of ABC50 impaired cap-dependent translation, translation driven by certain internal ribosome entry segments was not inhibited. ABC50 is located in the cytoplasm and nucleoplasm but not in the nucleolus. Thus, ABC50 is not likely to be directly involved in early ribosomal biogenesis, unlike some other ABC proteins. Taken together, the present data show that ABC50 plays a key role in translation initiation and has functions that are distinct from those of other non-membrane ABC proteins.
0021-9258
24061-24073
Paytubi, Sonia
73cef9b1-5761-4798-86a0-1177caa7ca88
Wang, Xuemin
d6bb4eb2-5687-46ed-b770-cceb22fd792e
Lam, Yun W.
3fbd7034-2afa-472c-8e17-204be1cd0fa8
Izquierdo, Luis
d11420bc-0955-4e7c-ab28-188a6ea2e163
Hunter, Mairi J.
73512849-98f3-4118-ae42-8d931acc5736
Jan, Eric
88d1d526-c117-439a-8aa1-87cee44dcea2
Hundal, Harinder S.
f89968b1-caa7-4927-a458-d47a0419fb52
Proud, Christopher G.
59dabfc8-4b44-4be8-a17f-578a58550cb3
Paytubi, Sonia
73cef9b1-5761-4798-86a0-1177caa7ca88
Wang, Xuemin
d6bb4eb2-5687-46ed-b770-cceb22fd792e
Lam, Yun W.
3fbd7034-2afa-472c-8e17-204be1cd0fa8
Izquierdo, Luis
d11420bc-0955-4e7c-ab28-188a6ea2e163
Hunter, Mairi J.
73512849-98f3-4118-ae42-8d931acc5736
Jan, Eric
88d1d526-c117-439a-8aa1-87cee44dcea2
Hundal, Harinder S.
f89968b1-caa7-4927-a458-d47a0419fb52
Proud, Christopher G.
59dabfc8-4b44-4be8-a17f-578a58550cb3

Paytubi, Sonia, Wang, Xuemin, Lam, Yun W., Izquierdo, Luis, Hunter, Mairi J., Jan, Eric, Hundal, Harinder S. and Proud, Christopher G. (2009) ABC50 promotes translation initiation in mammalian cells. The Journal of Biological Chemistry, 284 (36), 24061-24073. (doi:10.1074/jbc.M109.031625). (PMID:19570978)

Record type: Article

Abstract

ABC50 is an ATP-binding cassette (ABC) protein, which, unlike most ABC proteins, does not possess membrane-spanning domains. ABC50 interacts with eukaryotic initiation factor 2 (eIF2), which plays a key role in translation initiation and its control. ABC50 binds to ribosomes, and this interaction requires both the N-terminal domain and at least one ABC domain. Knockdown of ABC50 by RNA interference impaired translation of both cap-dependent and -independent reporters, consistent with a positive role for ABC50 in the function of eIF2, which is required for both types of translation initiation. Mutation of the Walker box A or B motifs in both ABC regions of ABC50 yielded a mutant protein that exerted a dominant-interfering phenotype with respect to protein synthesis and translation initiation. Importantly, although dominant-interfering mutants of ABC50 impaired cap-dependent translation, translation driven by certain internal ribosome entry segments was not inhibited. ABC50 is located in the cytoplasm and nucleoplasm but not in the nucleolus. Thus, ABC50 is not likely to be directly involved in early ribosomal biogenesis, unlike some other ABC proteins. Taken together, the present data show that ABC50 plays a key role in translation initiation and has functions that are distinct from those of other non-membrane ABC proteins.

This record has no associated files available for download.

More information

Published date: 4 September 2009

Identifiers

Local EPrints ID: 155577
URI: http://eprints.soton.ac.uk/id/eprint/155577
ISSN: 0021-9258
PURE UUID: e418dbc2-5bda-4b22-b73d-02a3d6615719

Catalogue record

Date deposited: 28 May 2010 08:47
Last modified: 14 Mar 2024 01:39

Export record

Altmetrics

Contributors

Author: Sonia Paytubi
Author: Xuemin Wang
Author: Yun W. Lam
Author: Luis Izquierdo
Author: Mairi J. Hunter
Author: Eric Jan
Author: Harinder S. Hundal
Author: Christopher G. Proud

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×