@article{HimmelVanderVenStoeckleinetal.2003, author = {Himmel, Mirko and VanderVen, Peter F. M. and St{\"o}cklein, Walter F. M. and F{\"u}rst, Dieter Oswald}, title = {The limits of promiscuity : isoform-specific dimerization of filamins}, year = {2003}, language = {en} } @article{GehmlichGeierOsterzieletal.2004, author = {Gehmlich, Katja and Geier, C. and Osterziel, Karl Joseph and VanderVen, Peter F. M. and F{\"u}rst, Dieter Oswald}, title = {Decreased interactions of mutant muscle LIM protein (MLP) with N-RAP and alpha-actinin and their implication for hypertrophic cardiomyopathy}, issn = {0302-766X}, year = {2004}, abstract = {Previous work has shown that mutations in muscle LIM protein (MLP) can cause hypertrophic cardiomyopathy (HCM). In order to gain an insight into the molecular basis of the disease phenotype, we analysed the binding characteristics of wild-type MLP and of the (C58G) mutant MLP that causes hypertrophic cardiomyopathy. We show that MLP can form a ternary complex with two of its previously documented myofibrillar ligand proteins, N-RAP and alpha-actinin, which indicates the presence of distinct, non-overlapping binding sites. Our data also show that, in comparison to wild-type MLP, the capacity of the mutated MLP protein to bind both N-RAP and alpha-actinin is significantly decreased. In addition, this single point mutation prevents zinc coordination and proper folding of the second zinc-finger in the first LIM domain, which consequently renders the protein less stable and more susceptible to proteolysis. The molecular basis for HCM-causing mutations in the MLP gene might therefore be an alteration in the equilibrium of interactions of the ternary complex MLP-N-RAP-alpha-actinin. This assumption is supported by the previous observation that in the pathological situation accompanied by MLP down regulation, cardiomyocytes try to compensate for the decreased stability of MLP protein by increasing the expression of its ligand N-RAP, which might finally result in the development of myocyte disarray that is characteristic of this disease}, language = {en} } @article{BeathamRomeroTownsendetal.2004, author = {Beatham, Jane L. and Romero, Rosario and Townsend, Stuart K.M. and Hacker, Terry and VanderVen, Peter F. M. and Blanco, Gonzalo}, title = {Filamin C interacts with the muscular dystrophy KY protein and is abnormally distributed in mouse KY deficient muscle fibres}, issn = {0964-6906}, year = {2004}, abstract = {The KY protein has been implicated in a neuromuscular dystrophy in the mouse, but its role in muscle function remains unclear. Here, we show that KY interacts with several sarcomeric cytoskeletal proteins including, amongst others, filamin C and the slow isoform of the myosin-binding protein C. These interactions were confirmed in vitro and because of its central role in skeletal muscle disease, characterized in more detail for filamin C. A role for KY in regulating filamin C function in vivo is supported by the expression analysis of filamin C in the null ky mouse mutant, where distinct irregular subcellular localization of filamin C was found in subsets of muscle fibres, which appears to be a specific outcome of KY deficiency. Furthermore, KY shows protease activity in in vitro assays, and specific degradation of filamin C by KY is shown in transfected cells. Given the enzymatic nature of the KY protein, it is likely that some of the identified partners are catalytic substrates. These results suggest that KY is an intrinsic part of the protein networks underlying the molecular mechanism of several limb-girdle muscular dystrophies, particularly those where interactions between filamin C and disease causing proteins have been shown}, language = {en} } @article{BeathamMiddletonRomeroetal.2004, author = {Beatham, Jane L. and Middleton, A. and Romero, Rosario and VanderVen, Peter F. M. and Blanco, Gonzalo}, title = {Functional characterisation of the Ky protein}, issn = {0960-8966}, year = {2004}, language = {en} } @article{VanderVenEhlerVakeeletal.2006, author = {VanderVen, Peter F. M. and Ehler, Elisabeth and Vakeel, Padmanabhan and Eulitz, Stefan and Schenk, J{\"o}rg A. and Milting, Hendrik and Micheel, Burkhard and F{\"u}rst, Dieter Oswald}, title = {Unusual splicing events result in distinct Xin isoforms that associate differentially with filamin c and Mena/ VASP}, doi = {10.1016/j.yexcr.2006.03.015}, year = {2006}, abstract = {Filamin c is the predominantly expressed filamin isoform in striated muscles. It is localized in myofibrillar Z- discs, where it binds FATZ and myotilin, and in myotendinous junctions and intercalated discs. Here, we identify Xin, the protein encoded by the human gene 'cardiomyopathy associated 1' (CMYA1) as filamin c binding partner at these specialized structures where the ends of myofibrils are attached to the sarcolemma. Xin directly binds the EVH1 domain proteins Mena and VASP. In the adult heart, Xin and Mena/VASP colocalize with filamin c in intercalated discs. In cultured cardiomyocytes, the proteins also localize in the nonstriated part of myofibrils, where sarcomeres are assembled and an extensive reorganization of the actin cytoskeleton occurs. Unusual intraexonic splicing events result in the existence of three Xin isoforms that associate differentially with its ligands. The identification of the complex filamin c-Xin-Mena/VASP provides a first glance on the role of Xin in the molecular mechanisms involved in developmental and adaptive remodeling of the actin cytoskeleton during cardiac morphogenesis and sarcomere assembly. (c) 2006 Elsevier Inc. All rights reserved}, language = {en} }