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      The CLN3 gene and protein: What we know

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          Abstract

          Background

          One of the most important steps taken by Beyond Batten Disease Foundation in our quest to cure juvenile Batten (CLN3) disease is to understand the State of the Science. We believe that a strong understanding of where we are in our experimental understanding of the CLN3 gene, its regulation, gene product, protein structure, tissue distribution, biomarker use, and pathological responses to its deficiency, lays the groundwork for determining therapeutic action plans.

          Objectives

          To present an unbiased comprehensive reference tool of the experimental understanding of the CLN3 gene and gene product of the same name.

          Methods

          BBDF compiled all of the available CLN3 gene and protein data from biological databases, repositories of federally and privately funded projects, patent and trademark offices, science and technology journals, industrial drug and pipeline reports as well as clinical trial reports and with painstaking precision, validated the information together with experts in Batten disease, lysosomal storage disease, lysosome/endosome biology.

          Results

          The finished product is an indexed review of the CLN3 gene and protein which is not limited in page size or number of references, references all available primary experiments, and does not draw conclusions for the reader.

          Conclusions

          Revisiting the experimental history of a target gene and its product ensures that inaccuracies and contradictions come to light, long‐held beliefs and assumptions continue to be challenged, and information that was previously deemed inconsequential gets a second look. Compiling the information into one manuscript with all appropriate primary references provides quick clues to which studies have been completed under which conditions and what information has been reported. This compendium does not seek to replace original articles or subtopic reviews but provides an historical roadmap to completed works.

          Abstract

          The CLN3 gene, its regulation, gene product, CLN3 protein structure, tissue distribution, biomarker use, and pathological responses to its deficiency.

          Related collections

          Most cited references187

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          Signals for sorting of transmembrane proteins to endosomes and lysosomes.

          Sorting of transmembrane proteins to endosomes and lysosomes is mediated by signals present within the cytosolic domains of the proteins. Most signals consist of short, linear sequences of amino acid residues. Some signals are referred to as tyrosine-based sorting signals and conform to the NPXY or YXXO consensus motifs. Other signals known as dileucine-based signals fit [DE]XXXL[LI] or DXXLL consensus motifs. All of these signals are recognized by components of protein coats peripherally associated with the cytosolic face of membranes. YXXO and [DE]XXXL[LI] signals are recognized with characteristic fine specificity by the adaptor protein (AP) complexes AP-1, AP-2, AP-3, and AP-4, whereas DXXLL signals are recognized by another family of adaptors known as GGAs. Several proteins, including clathrin, AP-2, and Dab2, have been proposed to function as recognition proteins for NPXY signals. YXXO and DXXLL signals bind in an extended conformation to the mu2 subunit of AP-2 and the VHS domain of the GGAs, respectively. Phosphorylation events regulate signal recognition. In addition to peptide motifs, ubiquitination of cytosolic lysine residues also serves as a signal for sorting at various stages of the endosomal-lysosomal system. Conjugated ubiquitin is recognized by UIM, UBA, or UBC domains present within many components of the internalization and lysosomal targeting machinery. This complex array of signals and recognition proteins ensures the dynamic but accurate distribution of transmembrane proteins to different compartments of the endosomal-lysosomal system.
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            Data growth and its impact on the SCOP database: new developments

            The Structural Classification of Proteins (SCOP) database is a comprehensive ordering of all proteins of known structure, according to their evolutionary and structural relationships. The SCOP hierarchy comprises the following levels: Species, Protein, Family, Superfamily, Fold and Class. While keeping the original classification scheme intact, we have changed the production of SCOP in order to cope with a rapid growth of new structural data and to facilitate the discovery of new protein relationships. We describe ongoing developments and new features implemented in SCOP. A new update protocol supports batch classification of new protein structures by their detected relationships at Family and Superfamily levels in contrast to our previous sequential handling of new structural data by release date. We introduce pre-SCOP, a preview of the SCOP developmental version that enables earlier access to the information on new relationships. We also discuss the impact of worldwide Structural Genomics initiatives, which are producing new protein structures at an increasing rate, on the rates of discovery and growth of protein families and superfamilies. SCOP can be accessed at http://scop.mrc-lmb.cam.ac.uk/scop.
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              Modulation of A-type potassium channels by a family of calcium sensors.

              In the brain and heart, rapidly inactivating (A-type) voltage-gated potassium (Kv) currents operate at subthreshold membrane potentials to control the excitability of neurons and cardiac myocytes. Although pore-forming alpha-subunits of the Kv4, or Shal-related, channel family form A-type currents in heterologous cells, these differ significantly from native A-type currents. Here we describe three Kv channel-interacting proteins (KChIPs) that bind to the cytoplasmic amino termini of Kv4 alpha-subunits. We find that expression of KChIP and Kv4 together reconstitutes several features of native A-type currents by modulating the density, inactivation kinetics and rate of recovery from inactivation of Kv4 channels in heterologous cells. All three KChIPs co-localize and co-immunoprecipitate with brain Kv4 alpha-subunits, and are thus integral components of native Kv4 channel complexes. The KChIPs have four EF-hand-like domains and bind calcium ions. As the activity and density of neuronal A-type currents tightly control responses to excitatory synaptic inputs, these KChIPs may regulate A-type currents, and hence neuronal excitability, in response to changes in intracellular calcium.
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                Author and article information

                Journal
                Mol Genet Genomic Med
                Mol Genet Genomic Med
                10.1002/(ISSN)2324-9269
                MGG3
                Molecular Genetics & Genomic Medicine
                John Wiley and Sons Inc. (Hoboken )
                2324-9269
                30 September 2019
                December 2019
                : 7
                : 12 ( doiID: 10.1002/mgg3.v7.12 )
                : e859
                Affiliations
                [ 1 ] Mila’s Miracle Foundation Boulder Colorado
                [ 2 ] Craft Science Inc. Thornhill Canada
                [ 3 ] Baylor College of Medicine Houston Texas
                [ 4 ] Jan and Dan Duncan Neurological Research Institute at Texas Children’s Hospital Houston Texas
                [ 5 ] Center for Genomic Medicine Massachusetts General Hospital/Harvard Medical School Boston Massachusetts
                [ 6 ] School of Biosciences Cardiff University Cardiff UK
                [ 7 ] Biochemistry University Medical Center Hamburg‐Eppendorf Hamburg Germany
                [ 8 ] Neurology University Hospital Wuerzburg Wuerzburg Germany
                [ 9 ] Biochemistry and Biophysics UCSF School of Medicine San Francisco California
                [ 10 ] Telethon Institute of Genetics and Medicine Napoli Italy
                [ 11 ] Beyond Batten Disease Foundation Austin Texas
                Author notes
                [*] Correspondence

                Danielle M. Kerkovich, Principal Scientist, Beyond Batten Disease Foundation, P.O. Box 50221, Austin, TX 78763.

                Email: dkerkovich@ 123456beyondbatten.org

                Author information
                https://orcid.org/0000-0002-0215-2054
                Article
                MGG3859
                10.1002/mgg3.859
                6900386
                31568712
                a68b9539-7d41-4201-abd2-981425e010d4
                © 2019 The Authors. Molecular Genetics & Genomic Medicine published by Wiley Periodicals, Inc.

                This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

                History
                : 09 August 2018
                : 30 May 2019
                : 31 May 2019
                Page count
                Figures: 11, Tables: 7, Pages: 41, Words: 27087
                Funding
                Funded by: Beyond Batten Disease Foundation , open-funder-registry 10.13039/100011516;
                Categories
                Review Article
                Review Article
                Custom metadata
                2.0
                December 2019
                Converter:WILEY_ML3GV2_TO_JATSPMC version:5.7.2 mode:remove_FC converted:08.12.2019

                batten,cln3,jncl,juvenile batten,neuronal ceroid lipofuscinosis

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