Table of contents


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Editorial

Sliding across a cytoskeletal milestone p375

doi:10.1038/ncb0504-375


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Book Review

The Promethean Fire of Cloning p377

R. Alta Charo reviews A Clone of Your Own? The science and ethics of cloning by Arlene Judith Klotzko

doi:10.1038/ncb0504-377


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News and Views

N-terminal acetylation targets GTPases to membranes pp379 - 380

Catherine L. Jackson

doi:10.1038/ncb0504-379

The small GTPases Arl3p and Arl1p function sequentially to recruit diverse effector proteins to the Golgi apparatus. Similarly to ARF proteins, Arl1p is targeted to membranes by myristoylation. Arl3p, however, is not myristoylated. Recent work demonstrates that Arl3p, and its mammalian orthologue ARFRP1, are targeted to membranes by amino-terminal acetylation, which facilitates recognition by the membrane receptor Sys1p/hSys1.

See also: Article by Behnia et al. | Article by Setty et al.


Egalitarian and the case of the missing link pp381 - 383

John Pearson & Acaimo González-Reyes

doi:10.1038/ncb0504-381

The specificity of cytoskeleton-mediated cargo transport is critical for cell polarization. The Egalitarian protein — required for the localization of mRNAs and proteins to the oocyte of the Drosophila melanogaster ovary — is now reported to interact with an integral component of the dynein motor complex, the dynein light chain Dlc1.

See also: Letter by Navarro et al.


Human disease: the centrosome connection p383

Sowmya Swaminathan

doi:10.1038/ncb0504-383


New candidates for vesicle coat proteins pp384 - 385

Michael Roth

doi:10.1038/ncb0504-384

Proteins exit the trans-Golgi network (TGN) through multiple mechanisms that are poorly understood. New work identifies FAPP1 and FAPP2 as TGN-localized proteins that regulate post-Golgi carrier formation through interactions with phosphatidylinositol 4-phosphate (PtdIns(4)P) and ARF1.

See also: Article by Godi et al.


Fatal liaisons of p53 with Bax and Bak pp386 - 388

Jean-Luc Perfettini, Romano T. Kroemer & Guido Kroemer

doi:10.1038/ncb0504-386

p53 can induce apoptosis through its well defined role as a regulator of transcription, but also by a less well defined transcription-independent mechanism. Two recent studies demonstrate that p53 mediates mitochondrial permeabilization through direct physical interactions with the pro-apoptotic Bcl-2 family members, Bax and Bak.

See also: Letter by Leu et al.


A Bit-role for integrins in apoptosis pp388 - 389

Dwayne G. Stupack & David A. Cheresh

doi:10.1038/ncb0504-388

Loss of integrin-mediated attachment to the extracellular matrix triggers apoptosis through the activation of caspases. A recent study shows that disruption of integrin function also induces mitochondrial release of Bit1, a caspase-independent effector of apoptosis.


Actin dynamics: re-drawing the map pp390 - 391

Phillip R. Gordon-Weeks

doi:10.1038/ncb0504-390

The microtubule-associated proteins MAP2 and tau are important for regulating microtubule dynamics and bundling, but can also bind to actin filaments. It seems, however, that only MAP2 can bind directly to actin filaments and, curiously, the actin-binding domain is situated within the microtubule-binding domain.


Cell of the month: Differentiating mouse embryonic stem cells p392

Lia Scotti Campos

doi:10.1038/ncb0504-392


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Articles

FAPPs control Golgi-to-cell-surface membrane traffic by binding to ARF and PtdIns(4)P pp393 - 404

Anna Godi, Antonella Di Campli, Athanasios Konstantakopoulos, Giuseppe Di Tullio, Dario R. Alessi, Gursant S. Kular, Tiziana Daniele, Pierfrancesco Marra, John M. Lucocq & M. Antonietta De Matteis

doi:10.1038/ncb1119

See also: News and Views by Roth


Targeting of the Arf-like GTPase Arl3p to the Golgi requires N-terminal acetylation and the membrane protein Sys1p pp405 - 413

Rudy Behnia, Bojana Panic, James R. C. Whyte & Sean Munro

doi:10.1038/ncb1120

See also: News and Views by Jackson


Golgi targeting of ARF-like GTPase Arl3p requires its Nalpha-acetylation and the integral membrane protein Sys1p pp414 - 419

Subba Rao Gangi Setty, Todd I. Strochlic, Amy Hin Yan Tong, Charles Boone & Christopher G. Burd

doi:10.1038/ncb1121

See also: News and Views by Jackson


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Letters

PtdIns(3,4,5)P3 binding is necessary for WAVE2-induced formation of lamellipodia pp420 - 426

Tsukasa Oikawa, Hideki Yamaguchi, Toshiki Itoh, Masayoshi Kato, Takeshi Ijuin, Daisuke Yamazaki, Shiro Suetsugu & Tadaomi Takenawa

doi:10.1038/ncb1125


Egalitarian binds dynein light chain to establish oocyte polarity and maintain oocyte fate pp427 - 435

Caryn Navarro, Hamsa Puthalakath, Jerry M. Adams, Andreas Strasser & Ruth Lehmann

doi:10.1038/ncb1122

See also: News and Views by Pearson & González-Reyes


In vivo self-renewing divisions of haematopoietic stem cells are increased in the absence of the early G1-phase inhibitor, p18INK4C pp436 - 442

Youzhong Yuan, Hongmei Shen, David S. Franklin, David T. Scadden & Tao Cheng

doi:10.1038/ncb1126


Mitochondrial p53 activates Bak and causes disruption of a Bak–Mcl1 complex pp443 - 450

J. I-Ju Leu, Patrick Dumont, Michael Hafey, Maureen E. Murphy & Donna L. George

doi:10.1038/ncb1123

See also: News and Views by Perfettini et al.


Amplitude control of cell-cycle waves by nuclear import pp451 - 457

Attila Becskei, Monica G. Boselli & Alexander van Oudenaarden

doi:10.1038/ncb1124


An epididymis-specific beta-defensin is important for the initiation of sperm maturation pp458 - 464

Chen Xi Zhou, Yong-Lian Zhang, Liqing Xiao, Min Zheng, Ka Man Leung, Man Yee Chan, Pui Shan Lo, Lai Ling Tsang, Hau Yan Wong, Lok Sze Ho, Yiu Wa Chung & Hsiao Chang Chan

doi:10.1038/ncb1127


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