start-ver=1.4 cd-journal=joma no-vol=1774 cd-vols= no-issue=4 article-no= start-page=456 end-page=465 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=200704 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Tissue-specific interactions of TNI isoforms with other TN subunits and tropomyosins in C. elegans: The role of the C- and N-terminal extensions en-subtitle= kn-subtitle= en-abstract= kn-abstract=The aim of this study is to investigate the function of the C-terminal extension of three troponin I isoforms, that are unique to the body wall muscles of Caenorhabditis elegans and to understand the molecular interactions within the TN complex between troponin I with troponin C/T, and tropomyosin. We constructed several expression vectors to generate recombinant proteins of three body wall and one pharyngeal troponin I isoforms in Escherichia coli. Protein overlay assays and Western blot analyses were performed using antibodies. We demonstrated that pharyngeal TNI-4 interacted with only the pharyngeal isoforms of troponin C/T and tropomyosin. In contrast, the body wall TNI-2 bound both the body wall and pharyngeal isoforms of these components. Similar to other invertebrates, the N-terminus of troponin I contributes to interactions with troponin C. Full-length troponin I was essential for interactions with tropomyosin isoforms. Deletion of the C-terminal extension had no direct effect on the binding of the body wall troponin I to other muscle thin filament troponin C/T and tropomyosin isoforms. en-copyright= kn-copyright= en-aut-name=AminMd. Ziaul en-aut-sei=Amin en-aut-mei=Md. Ziaul kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=BandoTetsuya en-aut-sei=Bando en-aut-mei=Tetsuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=RuksanaRazia en-aut-sei=Ruksana en-aut-mei=Razia kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=Anokye-DansoFrederick en-aut-sei=Anokye-Danso en-aut-mei=Frederick kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=TakashimaYasuo en-aut-sei=Takashima en-aut-mei=Yasuo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=SakubeYasuji en-aut-sei=Sakube en-aut-mei=Yasuji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=KagawaHiroaki en-aut-sei=Kagawa en-aut-mei=Hiroaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= affil-num=1 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University affil-num=2 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University affil-num=3 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University affil-num=4 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University affil-num=5 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University affil-num=6 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University affil-num=7 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University en-keyword=Troponin I kn-keyword=Troponin I en-keyword=Caenorhabditis elegans kn-keyword=Caenorhabditis elegans en-keyword=Troponin T kn-keyword=Troponin T en-keyword=Troponin C kn-keyword=Troponin C en-keyword=Tropomyosin kn-keyword=Tropomyosin en-keyword=C-terminal extension kn-keyword=C-terminal extension END