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The localization of the ER retrieval sequence for the calcium pump SERCA1

The localization of the ER retrieval sequence for the calcium pump SERCA1
The localization of the ER retrieval sequence for the calcium pump SERCA1
A number of studies using chimeric constructs made by fusing endoplasmic/sarcoplasmic reticulum calcium pump (SERCA)sequences with those of the plasma membrane located calcium pump (PMCA) have suggested that the retention/
retrieval signal responsible for maintaining SERCA in the endoplasmic reticulum (ER) is located within the Nterminus
of these pumps. Because of the difficulties in identifying the presence of constructs at the plasma membrane we have used a trans-Golgi network (TGN) marker to evaluate whether chimeric proteins are retained by the ER or have lost their
retention/retrieval sequences and are able to enter the wider endomembrane system and reach the TGN. In this study, attempts to locate this retention/retrieval sequence demonstrate that the retention sequences are located not in the N-terminus, as previously suggested, but in the largely transmembranous C-terminal domain of SERCA. Further attempts to identify the precise retention/retrieval motif using SERCA1/PMCA3 chimeras were unsuccessful. This may be due to the fact that introducing SERCA1 sequences into the C-terminal PMCA3 sequence and vice versa disrupts the organization of the closely packed transmembrane helices leading to retention of such constructs by the quality control mechanisms of the ER. An alternative explanation is that SERCAs have targeting motifs that are non-linear, being made up of several segments of sequence to form a patch that interacts with the retrieval machinery.
0968-7688
216-226
Watson, Helen R.
70d56035-7600-4404-8312-b1e8ef64ee96
Butler, John
5132f0e2-f28d-412a-be9a-e97963b4c0ee
Schuppe, Hansjurgen
16080883-aaa8-4d87-93e0-e1b4ff0bc71f
Lee, Anthony G.
0891914c-e0e2-4ee1-b43e-1b70eb072d8e
East, J. Malcolm
9fe7f794-1d89-4935-9a99-b831d786056e
Watson, Helen R.
70d56035-7600-4404-8312-b1e8ef64ee96
Butler, John
5132f0e2-f28d-412a-be9a-e97963b4c0ee
Schuppe, Hansjurgen
16080883-aaa8-4d87-93e0-e1b4ff0bc71f
Lee, Anthony G.
0891914c-e0e2-4ee1-b43e-1b70eb072d8e
East, J. Malcolm
9fe7f794-1d89-4935-9a99-b831d786056e

Watson, Helen R., Butler, John, Schuppe, Hansjurgen, Lee, Anthony G. and East, J. Malcolm (2011) The localization of the ER retrieval sequence for the calcium pump SERCA1. Molecular Membrane Biology, 28 (4), 216-226. (doi:10.3109/09687688.2011.572566).

Record type: Article

Abstract

A number of studies using chimeric constructs made by fusing endoplasmic/sarcoplasmic reticulum calcium pump (SERCA)sequences with those of the plasma membrane located calcium pump (PMCA) have suggested that the retention/
retrieval signal responsible for maintaining SERCA in the endoplasmic reticulum (ER) is located within the Nterminus
of these pumps. Because of the difficulties in identifying the presence of constructs at the plasma membrane we have used a trans-Golgi network (TGN) marker to evaluate whether chimeric proteins are retained by the ER or have lost their
retention/retrieval sequences and are able to enter the wider endomembrane system and reach the TGN. In this study, attempts to locate this retention/retrieval sequence demonstrate that the retention sequences are located not in the N-terminus, as previously suggested, but in the largely transmembranous C-terminal domain of SERCA. Further attempts to identify the precise retention/retrieval motif using SERCA1/PMCA3 chimeras were unsuccessful. This may be due to the fact that introducing SERCA1 sequences into the C-terminal PMCA3 sequence and vice versa disrupts the organization of the closely packed transmembrane helices leading to retention of such constructs by the quality control mechanisms of the ER. An alternative explanation is that SERCAs have targeting motifs that are non-linear, being made up of several segments of sequence to form a patch that interacts with the retrieval machinery.

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Published date: May 2011
Organisations: Molecular and Cellular

Identifiers

Local EPrints ID: 208153
URI: http://eprints.soton.ac.uk/id/eprint/208153
ISSN: 0968-7688
PURE UUID: 997328b2-9ca2-42d2-baab-06e772397c68

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Date deposited: 18 Jan 2012 15:12
Last modified: 14 Mar 2024 04:41

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Contributors

Author: Helen R. Watson
Author: John Butler
Author: Hansjurgen Schuppe
Author: Anthony G. Lee
Author: J. Malcolm East

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