title: The extra C-terminal tail is involved in the conformation, stability changes and the N/C-domain interactions of the calmodulin-like protein from pearl oyster Pinctada fucata.
abstract: Pearl oyster Pinctada fucata calmodulin-like protein (PfCaLP), containing an extra tail (D150-K161) at the C-terminal, is a novel protein involved in the regulation of oyster calcium metabolism. The purpose of this study is to gain insight into the conformational characteristics of the N/C-domain of PfCaLP, especially the detailed contribution of the extra tail to the Ca(2+)/Mg(2+)-induced conformational changes, the stability of the intact PfCaLP molecule and its C-domain, as well as to the interdomain communications in PfCaLP. Our results demonstrate that a strong interaction exists between the hydrophilic tail and the C-domain of PfCaLP. The extra tail, through affecting the C-domain conformational changes, further influences the migration rate, conformational changes, N/C-domain interactions and exposure of the hydrophobic patches of the intact PfCaLP molecule. Furthermore, the tail could actively regulate the stability of PfCaLP and its C-domain. Our studies are helpful to explain our previous finding that the tail plays important roles in PfCaLP-target interaction in the oyster calcium metabolism.
authors.affiliation: Institute of Marine Biotechnology, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Wang
authors.forename: Shuo
authors.initials: S
authors.lastname: Li
authors.forename: Changzhong
authors.initials: C
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Liang
authors.forename: Zi
authors.initials: Z
authors.lastname: Fang
authors.forename: Liping
authors.initials: L
authors.lastname: Xie
authors.forename: Rongqing
authors.initials: R
authors.lastname: Zhang
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism / Q000494:pharmacology; D002147:Calmodulin / Q000737:chemistry* / Q000378:metabolism*; D002942:Circular Dichroism; D024202:Electrophoretic Mobility Shift Assay; D005453:Fluorescence; D010649:Phenylalanine / Q000737:chemistry; D049911:Pinctada / Q000737:chemistry* / Q000378:metabolism; D011485:Protein Binding; D011487:Protein Conformation; D011489:Protein Denaturation; D017434:Protein Structure, Tertiary / Q000502:physiology; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D014443:Tyrosine / Q000737:chemistry
chemical_list: D002147:Calmodulin; D011994:Recombinant Proteins; D014443:Tyrosine; D010649:Phenylalanine; D002118:Calcium