Diphthamide biosynthesis requires an organic radical generated by an
iron--sulphur enzyme pp891-896
Translation elongation factor 2 (EF2) from archaea and eukaryotes contains a
unique, post-translationally modified histidine residue called diphthamide,
which is the target of diphtheria toxin. The biosynthesis of diphthamide
involves three steps; here it is shown that the first step in the archaeon
Pyrococcus horikoshii requires an unusual iron-sulphur-cluster enzyme, Dph2.
It catalyses unprecedented chemistry.
Yang Zhang et al.
doi:10.1038/nature09138
Abstract:
http://www.nature.com/nature/journal/v465/n7300/abs/nature09138.html
Article:
http://www.nature.com/nature/journal/v465/n7300/full/nature09138.html

----------------------
LETTERS
----------------------
Size and albedo of Kuiper belt object 55636 from a stellar
occultation pp897-900
KBO 55636 (2002 TX300) is one of the Kuiper belt objects [mdash]
specifically, a member of the water-ice-rich Haumea KBO collisional family.
Here, observations are reported of a multi-chord stellar occultation by KBO
55636. Calculations show that KBO 55636 is smaller than previously thought
and, like its parent body, is highly reflective. The dynamical age implies
either that it has an active resurfacing mechanism, or that fresh water-ice
in the outer Solar System can persist for gigayear timescales.
J. L. Elliot et al.
doi:10.1038/nature09109
Abstract:
http://www.nature.com/nature/journal/v465/n7300/abs/nature09109.html
Article:
http://www.nature.com/nature/journal/v465/n7300/full/nature09109.html

Real-space observation of a two-dimensional skyrmion crystal pp901-904
Skyrmions are stable topological textures with particle-like properties
[mdash] a mathematical concept that was originally used to describe nuclear
particles but has since turned up at all scales. Last year, the presence of
skyrmions in the magnetic compounds MnSi and Fe1-xCoxSi was confirmed with
neutron-scattering experiments. Here, real-space images are presented of a
two-dimensional skyrmion lattice in a thin film of the latter compound. The
observed nanometre-scale spin topology might reveal new magneto-transport
effects.
X. Z. Yu et al.
doi:10.1038/nature09124
Abstract:
http://www.nature.com/nature/journal/v465/n7300/abs/nature09124.html
Article:
http://www.nature.com/nature/journal/v465/n7300/full/nature09124.html

Visualizing and controlling vibrational wave packets of single
molecules pp905-908
Over the past few decades, two techniques in particular have opened up new
avenues for probing molecular processes: ultrafast spectroscopy and
single-molecule detection. The two approaches have now been combined,

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