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When something goes wrong, the ribosome can stall, and a quality control crew is summoned to the site.To clean up the mess, the ribosome is disassembled, the blueprint is discarded, and the partly made protein is recycled.Envie de vous évader dans un roman d’amour ou d’aventure, humoristique, romantique ou historique, une romance… De découvrir des histoires inédites, des aventures haletantes, des fictions prenantes ?

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Fischer, “X-ray diffraction microscopy of magnetic structures,” Phys.

Biró, “Bioinspired photonic nanoarchitectures from graphitic thin films,” Thin Solid Films 519(12), 4078–4081 (2011).

Yet this study reveals a surprising role for one member of the quality control team, a protein conserved from yeast to man named Rqc2.

Before the incomplete protein is recycled, Rqc2 prompts the ribosomes to add just two amino acids (of a total of 20) - alanine and threonine - over and over, and in any order.

A new finding goes against dogma, showing for the first time that the building blocks of a protein, called amino acids, can be assembled by another protein, and without genetic instructions). D., University of Utah Open any introductory biology textbook and one of the first things you'll learn is that our DNA spells out the instructions for making proteins, tiny machines that do much of the work in our body's cells. 2 in Science defy textbook science, showing for the first time that the building blocks of a protein, called amino acids, can be assembled without blueprints - DNA and an intermediate template called messenger RNA (m RNA).

The Rqc2 protein (yellow) binds t RNAs (dark blue, teal) which add amino acids (bright spot in middle) to a partially made protein (green). A team of researchers has observed a case in which another protein specifies which amino acids are added.

Independent verification is provided via X-ray diffractometry.

Simulations of dense random packing of spheres have also been used to explore the origin of the structural order measured.

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