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Short Report
Interaction between Anillin and RacGAP50C connects the actomyosin contractile ring with spindle microtubules at the cell division site
Pier Paolo D'Avino, Tetsuya Takeda, Luisa Capalbo, Wei Zhang, Kathryn S. Lilley, Ernest D. Laue, David M. Glover
Journal of Cell Science 2008 121: 1151-1158; doi: 10.1242/jcs.026716
Pier Paolo D'Avino
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Tetsuya Takeda
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Luisa Capalbo
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Wei Zhang
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Kathryn S. Lilley
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Ernest D. Laue
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David M. Glover
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  •   Fig. 1.
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    Fig. 1.

    Isolation of proteins interacting with Anillin in Drosophila cells. (A) Cells stably expressing the Ani::PtA transgene were fixed and stained to detect Protein A (red in merged panels), tubulin (green in merged panels) and DNA (blue in merged panels). (B) Colloidal Coomassie-stained gel of one the two purifications from Ani::PtA cells. The position of some of the proteins identified by mass spectrometry (MS) is indicated on the right (also see Table 1). The bait, Ani::PtA, is in red. The numbers on the left indicate the size in kD of the molecular-weight marker. Scale bar: 10 μm.

  • Table 1.

    List of the major proteins identified by mass spectrometry that interact with Anillin in Drosophila cells

    Protein Score Peptides
    Actin 5C 1483 784
    Actin 42A 1470 778
    Actin 57B 1010 468
    Actin 79B 812 401
    Actin 87E 981 466
    Actin 88F 941 439
    Anillin (Scraps) 3166 175
    Arc-p34 934 41
    Myosin HC (Zipper) 7303 767
    Myosin LC (Sqh) 855 283
    Myosin 31DF 3215 119
    Myosin 61F 3076 172
    Pav-KLP 37 2
    RacGAP50C 1132 30
    Septin 2 226 5
    Septin 3 (Peanut) 184 5
    Septin 5 43 3
    α-Spectrin 6597 167
    β-Spectrin 4536 121
    βH-Spectrin (Karst) 2459 57
    Tropomyosin I 519 10
    • The proteins shown in Fig. 1B are listed along with their relative MS score and number of peptides. The bait, Ani::PtA, is in red

  •   Fig. 2.
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    Fig. 2.

    Colocalization of Anillin and RacGAP50C during cell division. (A) Cells were treated with DMSO (control) or Lat-A for 1 hour, and were then fixed and stained to detect Anillin (red in merged panels), tubulin (green in merged panels) and DNA (blue in merged panels). The rightmost panels show a magnification of the microtubules contacting the equatorial cortex in a Lat-A-treated cell; the spindle axis and chromosomes are not contained in this field. The arrowhead marks Anillin localization at the microtubule plus ends. (B) Cells were treated with DMSO (control) or Lat-A for 1 hour, and were then fixed and stained to detect Anillin (red in merged panels), RacGAP50C (green in merged panels) and DNA (blue in merged panels). The bracket and arrowheads mark the sites of Anillin and RacGAP50C colocalization (orange/yellow in merged panels). Note the colocalization at the microtubule plus ends in Lat-A-treated cells. (C) Cells were first incubated with dsRNA directed against RacGAP50C for 48 hours and then treated with DMSO (control) or Lat-A for 1 hour. The samples were then fixed and stained to detect Anillin (red in merged panels), tubulin (green in merged panels) and DNA (blue in merged panels). Note the absence of Anillin rod-shaped structure at the microtubule plus ends (marked by the arrow) in Lat-A-treated cells. Scale bars: 10 μm.

  •   Fig. 3.
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    Fig. 3.

    Anillin and RacGAP50C interact in vitro. (A) At the left is shown a schematic representation of the full-length Anillin protein and of the several fragments used for in vitro binding assays. The PH domain and myosin (My)- and actin (Ac)-binding regions are indicated. The thick grey line marks the region showing the highest homology among different species (Anillin Homology Domain, AHD). The autoradiograph of the pull-down assay along with a Coomassie-stained gel (CBB) showing the amounts of bait proteins used for the binding assay are shown at the right. The top bands in the Coomassie gel correspond to the full-length GST-tagged baits. (B) Subcellular localization of GFP-tagged Anillin fragments. A schematic description of the fragment tagged with GFP is shown at the left and their relative subcellular localization at the right. The cells were fixed and stained to detect tubulin (red in merged panels), GFP (green in merged panels) and DNA (blue in merged panels). The arrowhead marks the spindle midzone localization of Ani410-1104. (C) At the left is shown a schematic representation of the full-length RacGAP50C protein and of the several fragments used for in vitro binding assays. The GAP and C1 domains, and Pav-KLP (Pav)- and Pebble (Pbl)-binding regions are indicated. The autoradiographs of the pull-down assays are shown at the right. The amount of GST and GST-A4 proteins used is the same as in A. Scale bar: 10 μm.

  •   Fig. 4.
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    Fig. 4.

    Anillin recruits Pnut and Sep2 to the cleavage furrow. (A) Cells were treated for 48 hours with dsRNAs directed against either Anillin or GFP (control), and were then fixed and stained to detect tubulin (green in merged panels), DNA (blue in merged panels) and either Pnut or Sep2 (red in merged panels). (B) Western blot analysis of protein levels after RNAi treatment. Cells were incubated with dsRNAs directed against either Anillin or GFP (control). After 48 hours the proteins were extracted and separated on a 10% SDS gel, transferred onto a PVDF membrane and probed with antibodies against Anillin and α-tubulin. (C) Cells were treated for 96 hours with dsRNAs directed against GFP (control), pnut, Sep2 or both septins simultaneously, and then fixed and stained to detect Anillin (red in merged panels), tubulin (green in merged panels) and DNA (blue in merged panels). (D) Western blot analysis of protein levels after RNAi treatment. Cells were incubated with dsRNAs directed against GFP (control), pnut, Sep2 or both septins simultaneously. After 96 hours the proteins were extracted and separated on a 10% SDS gel, transferred onto a PVDF membrane and probed with antibodies against Pnut, Sep2 and α-tubulin. Scale bar: 10 μm.

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Short Report
Interaction between Anillin and RacGAP50C connects the actomyosin contractile ring with spindle microtubules at the cell division site
Pier Paolo D'Avino, Tetsuya Takeda, Luisa Capalbo, Wei Zhang, Kathryn S. Lilley, Ernest D. Laue, David M. Glover
Journal of Cell Science 2008 121: 1151-1158; doi: 10.1242/jcs.026716
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Short Report
Interaction between Anillin and RacGAP50C connects the actomyosin contractile ring with spindle microtubules at the cell division site
Pier Paolo D'Avino, Tetsuya Takeda, Luisa Capalbo, Wei Zhang, Kathryn S. Lilley, Ernest D. Laue, David M. Glover
Journal of Cell Science 2008 121: 1151-1158; doi: 10.1242/jcs.026716

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