네이처 컨텐츠

Volume 443 Number 7112

리서치 하이라이트

컨텐츠

News & Views

Particle physicsDid the Big Bang boil? p.637

Standard theories tell us that, at some point in the Universe's evolution, free quarks and gluons must have become bound together into the hadronic matter we see today. But was this transition abrupt or smooth?

Frank Wilczek

doi: 10.1038/443637a

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Evolutionary biologyFly eyes get the whole picture p.638

The compound eyes of ancestral flies picked up only one picture point in each facet. The evolution of a means to split up the light-sensitive cells increased this number to seven, boosting the eye's resolution greatly.

Kevin Moses

doi: 10.1038/nature05209

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Physical chemistrySeeds of phase change p.641

An effective but counter-intuitive trick to obtain highly ordered protein crystals is to 'seed' particles on disordered, porous surfaces. Computer simulations provide an explanation for the success of this strategy.

Daan Frenkel

doi: 10.1038/443641a

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NeuroscienceControlled capillaries p.642

The finest scale of blood flow through the brain occurs in capillaries. Suspicions that capillary flow is regulated by cells that put the squeeze on these vessels are now borne out by detailed experiments.

Brian A. MacVicar & Michael W. Salter

doi: 10.1038/443642a

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Earth sciencesUps and downs of ancient oxygen p.643

The latest models suggest that atmospheric oxygen could have fluctuated between high and low concentrations once photosynthesis had evolved. But does the geological evidence really support this?

James F. Kasting

doi: 10.1038/443643a

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EcologyMoving to the ideal free home p.645

Pike move between two basins of a British lake to maximize their evolutionary fitness. This adaptive behaviour suggests that habitat selection is more significant in population dynamics than was thought.

Douglas W. Morris

doi: 10.1038/443645a

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Cell biologyMitochondria shape up p.646

Mitochondria are central to the process of programmed cell death that kills damaged or superfluous cells. Surprisingly, components of the death machinery turn out to be essential for keeping these organelles in shape.

Barbara Conradt

doi: 10.1038/443646a

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Articles

Structure of eEF3 and the mechanism of transfer RNA release from the E-site p.663

Elongation factor eEF3 is an ATPase that, in addition to the two canonical factors eEF1A and eEF2, serves an essential function in the translation cycle of fungi. eEF3 is required for the binding of the aminoacyl-tRNA–eEF1A–GTP ternary complex to the ribosomal A-site and has been suggested to facilitate the clearance of deacyl-tRNA from the E-site. Here we present the crystal structure of Saccharomyces cerevisiae eEF3, showing that it consists of an amino-terminal HEAT repeat domain, followed by a four-helix bundle and two ABC-type ATPase domains, with a chromodomain inserted in ABC2. Moreover, we present the cryo-electron microscopy structure of the ATP-bound form of eEF3 in complex with the post-translocational-state 80S ribosome from yeast. eEF3 uses an entirely new factor binding site near the ribosomal E-site, with the chromodomain likely to stabilize the ribosomal L1 stalk in an open conformation, thus allowing tRNA release.

Christian B. F. Andersen, Thomas Becker, Michael Blau, Monika Anand, Mario Halic, Bharvi Balar, Thorsten Mielke, Thomas Boesen, Jan Skov Pedersen, Christian M. T. Spahn + et al.

doi: 10.1038/nature05126

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