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FRET-Assisted Determination of CLN3 Membrane Topology

Juvenile neuronal ceroid lipofuscinosis (JNCL) is caused by mutations in the CLN3 gene, which encodes for a putative lysosomal transmembrane protein with thus far undescribed structure and function. Here we investigate the membrane topology of human CLN3 protein with a combination of advanced molecu...

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Autores principales: Ratajczak, Ewa, Petcherski, Anton, Ramos-Moreno, Juliana, Ruonala, Mika O.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4106830/
https://www.ncbi.nlm.nih.gov/pubmed/25051496
http://dx.doi.org/10.1371/journal.pone.0102593
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author Ratajczak, Ewa
Petcherski, Anton
Ramos-Moreno, Juliana
Ruonala, Mika O.
author_facet Ratajczak, Ewa
Petcherski, Anton
Ramos-Moreno, Juliana
Ruonala, Mika O.
author_sort Ratajczak, Ewa
collection PubMed
description Juvenile neuronal ceroid lipofuscinosis (JNCL) is caused by mutations in the CLN3 gene, which encodes for a putative lysosomal transmembrane protein with thus far undescribed structure and function. Here we investigate the membrane topology of human CLN3 protein with a combination of advanced molecular cloning, spectroscopy, and in silico computation. Using the transposomics cloning method we first created a library of human CLN3 cDNA clones either with a randomly inserted eGFP, a myc-tag, or both. The functionality of the clones was evaluated by assessing their ability to revert a previously reported lysosomal phenotype in immortalized cerebellar granular cells derived from Cln3 (Δex7/8) mice (CbCln3 (Δex7/8)). The double-tagged clones were expressed in HeLa cells, and FRET was measured between the donor eGFP and an acceptor DyLight547 coupled to a monoclonal α-myc antibody to assess their relative membrane orientation. The data were used together with previously reported experimental data to compile a constrained membrane topology model for hCLN3 using TOPCONS consensus membrane prediction algorithm. Our model with six transmembrane domains and cytosolic N- and C-termini largely agrees with those previously suggested but differs in terms of the transmembrane domain positions as well as in the size of the luminal loops. This finding improves understanding the function of the native hCLN3 protein.
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spelling pubmed-41068302014-07-23 FRET-Assisted Determination of CLN3 Membrane Topology Ratajczak, Ewa Petcherski, Anton Ramos-Moreno, Juliana Ruonala, Mika O. PLoS One Research Article Juvenile neuronal ceroid lipofuscinosis (JNCL) is caused by mutations in the CLN3 gene, which encodes for a putative lysosomal transmembrane protein with thus far undescribed structure and function. Here we investigate the membrane topology of human CLN3 protein with a combination of advanced molecular cloning, spectroscopy, and in silico computation. Using the transposomics cloning method we first created a library of human CLN3 cDNA clones either with a randomly inserted eGFP, a myc-tag, or both. The functionality of the clones was evaluated by assessing their ability to revert a previously reported lysosomal phenotype in immortalized cerebellar granular cells derived from Cln3 (Δex7/8) mice (CbCln3 (Δex7/8)). The double-tagged clones were expressed in HeLa cells, and FRET was measured between the donor eGFP and an acceptor DyLight547 coupled to a monoclonal α-myc antibody to assess their relative membrane orientation. The data were used together with previously reported experimental data to compile a constrained membrane topology model for hCLN3 using TOPCONS consensus membrane prediction algorithm. Our model with six transmembrane domains and cytosolic N- and C-termini largely agrees with those previously suggested but differs in terms of the transmembrane domain positions as well as in the size of the luminal loops. This finding improves understanding the function of the native hCLN3 protein. Public Library of Science 2014-07-22 /pmc/articles/PMC4106830/ /pubmed/25051496 http://dx.doi.org/10.1371/journal.pone.0102593 Text en © 2014 Ratajczak et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Ratajczak, Ewa
Petcherski, Anton
Ramos-Moreno, Juliana
Ruonala, Mika O.
FRET-Assisted Determination of CLN3 Membrane Topology
title FRET-Assisted Determination of CLN3 Membrane Topology
title_full FRET-Assisted Determination of CLN3 Membrane Topology
title_fullStr FRET-Assisted Determination of CLN3 Membrane Topology
title_full_unstemmed FRET-Assisted Determination of CLN3 Membrane Topology
title_short FRET-Assisted Determination of CLN3 Membrane Topology
title_sort fret-assisted determination of cln3 membrane topology
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4106830/
https://www.ncbi.nlm.nih.gov/pubmed/25051496
http://dx.doi.org/10.1371/journal.pone.0102593
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