title: A hydrophilic lamin-binding domain from the Drosophila YA protein can target proteins to the nuclear envelope.
abstract: The nuclear lamina provides an architectural framework for the nuclear envelope and an attachment site for interphase chromatin. In Drosophila eggs and early embryos its major constituent, lamin Dm0, interacts with a lamina protein called YA. When the lamin-interaction region of YA is deleted, YA still enters nuclei but fails to localize to nuclear envelopes, suggesting that lamin interaction targets YA to the nuclear envelope. Here, we show that C-terminal lamin-interacting region of YA is sufficient to target the heterologous soluble protein GFP-NLS to the nuclear periphery in Drosophila tissue culture cells. Yeast two-hybrid analysis and transient transfection assays further defined this domain: residues 556-696 of YA are sufficient for both lamin Dm0 interaction and the targeting of GFP-NLS to the nuclear periphery. This region of YA is hydrophilic and lacks any transmembrane domain or known membrane-targeting motifs. We propose that the localization of YA to the nuclear lamina involves interaction with polymerized lamin Dm0 mediated by the lamin-targeting domain of YA. This hydrophilic YA domain might provide a useful molecular tool for targeting heterologous non-membrane-associated proteins to the nuclear envelope.
authors.affiliation: Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853-2703, USA.
authors.forename: Shobana S
authors.initials: SS
authors.lastname: Mani
authors.forename: Rithwick
authors.initials: R
authors.lastname: Rajagopal
authors.forename: Amanda B
authors.initials: AB
authors.lastname: Garfinkel
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Fan
authors.forename: Mariana F
authors.initials: MF
authors.lastname: Wolfner
mesh_terms: D021581:Active Transport, Cell Nucleus; D000818:Animals; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D002868:Chromosomal Proteins, Non-Histone / Q000737:chemistry / Q000378:metabolism / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism / Q000502:physiology*; D004330:Drosophila / Q000378:metabolism*; D029721:Drosophila Proteins; D049452:Green Fluorescent Proteins; D034882:Lamins / Q000737:chemistry / Q000378:metabolism*; D008164:Luminescent Proteins / Q000378:metabolism; D008856:Microscopy, Fluorescence; D009685:Nuclear Envelope / Q000378:metabolism*; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D014162:Transfection; D020798:Two-Hybrid System Techniques
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D034882:Lamins; D008164:Luminescent Proteins; D011993:Recombinant Fusion Proteins; C066829:fs(1)Ya protein, Drosophila; D049452:Green Fluorescent Proteins