Phostensin caps to the pointed end of actin filaments and modulates actin dynamics. 2009

Ning-Sheng Lai, and Tzu-Fan Wang, and Shiu-Lan Wang, and Chun-Yu Chen, and Jia-yi Yen, and Hsien-lu Huang, and Chin Li, and Kuang-Yung Huang, and Su-Qin Liu, and Ta-Hsien Lin, and Hsien-bin Huang
Department of Medicine, DaLin Tzu Chi Buddhist Hospital, Chia-Yi, Taiwan.

Phostensin, a protein phosphatase 1 F-actin cytoskeleton targeting subunit encoded by KIAA1949, consists of 165 amino acids and is located between HLA-C and HLA-E gene clusters on human chromosome 6. In this current study, we characterized the biochemical functions of phostensin. Actin dynamics assays using gelsolin-actin seeds showed that phostensin decreases the elongation and depolymerization rates of actin filament pointed ends. The feature of phostensin that binds to the pointed ends of actin filaments was observed through fluorescent single filament binding assay. Taken together, our results suggested that phostensin is an actin filament pointed end-capping protein that is capable of modulating actin dynamics.

UI MeSH Term Description Entries
D008841 Actin Cytoskeleton Fibers composed of MICROFILAMENT PROTEINS, which are predominately ACTIN. They are the smallest of the cytoskeletal filaments. Actin Filaments,Microfilaments,Actin Microfilaments,Actin Cytoskeletons,Actin Filament,Actin Microfilament,Cytoskeleton, Actin,Cytoskeletons, Actin,Filament, Actin,Filaments, Actin,Microfilament,Microfilament, Actin,Microfilaments, Actin
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000199 Actins Filamentous proteins that are the main constituent of the thin filaments of muscle fibers. The filaments (known also as filamentous or F-actin) can be dissociated into their globular subunits; each subunit is composed of a single polypeptide 375 amino acids long. This is known as globular or G-actin. In conjunction with MYOSINS, actin is responsible for the contraction and relaxation of muscle. F-Actin,G-Actin,Actin,Isoactin,N-Actin,alpha-Actin,alpha-Isoactin,beta-Actin,gamma-Actin,F Actin,G Actin,N Actin,alpha Actin,alpha Isoactin,beta Actin,gamma Actin
D054645 Protein Phosphatase 1 A eukayrotic protein serine-threonine phosphatase subtype that dephosphorylates a wide variety of cellular proteins. The enzyme is comprised of a catalytic subunit and regulatory subunit. Several isoforms of the protein phosphatase catalytic subunit exist due to the presence of multiple genes and the alternative splicing of their mRNAs. A large number of proteins have been shown to act as regulatory subunits for this enzyme. Many of the regulatory subunits have additional cellular functions. PP1c Enzyme,Phosphoprotein Phosphatase-1 delta,Phosphoprotein Phosphatase-1 gamma 1,Protein Phosphatase 1, Catalytic Subunit,Protein Phosphatase 1, Catalytic Subunit, alpha Isoform,Protein Phosphatase 1, Catalytic Subunit, beta Isoform,Protein Phosphatase 1, Catalytic Subunit, delta Isoform,Protein Phosphatase 1, Catalytic Subunit, gamma Isoform,Protein Phosphatase 1, Catalytic Subunit, gamma1 Isoform,Protein Phosphatase 1, Catalytic Subunit, gamma2 Isoform,Protein Phosphatase 1, Inhibitory Subunit,Protein Phosphatase 1, Regulatory Subunit,Protein Phosphatase 1C,Protein Phosphatase 1C gamma,Protein Phosphatase 1gamma,Protein Phosphatase-1,Protein Phosphatase-1 alpha,Protein Phosphatase-1 gamma 2,Protein Phosphatase-1G,Protein Serine-Threonine Phosphatase 1 beta,Protein-Serine-Threonine Phosphatase 1 beta,Type 1 Serine Threonine Protein Phosphatase,Phosphatase-1 delta, Phosphoprotein,Phosphoprotein Phosphatase 1 delta,Phosphoprotein Phosphatase 1 gamma 1,Protein Phosphatase 1 alpha,Protein Phosphatase 1 gamma 2,Protein Phosphatase 1G,Protein Serine Threonine Phosphatase 1 beta

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