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  Molecule of the Month Transfer-Messenger RNA Damaged messenger RNA poses a double danger to cells. If a messenger RNA is truncated, it will be missing its stop codon, so it will encode a faulty, truncated protein. Also, ribosomes get stalled at the end of these truncated messages and are unable to release the mRNA and move on to the next protein synthesis job. Bacteria possess an ingenious molecular method for solving both of these problems at the same time, that destroys the faulty protein and releases the ribosome all at once. Full Article

  Protein Structure Initiative Featured System Bacterial Hemophores Our bodies are filled with iron: iron in hemoglobin colors our blood bright red and iron is used as a chemical tool in many cellular proteins. Altogether, we have several grams of iron scattered through our cells. Surprisingly, however, lack of iron often limits the growth of pathogenic bacteria infecting our bodies. This is by design: our bodies have evolved to guard their store of iron, so the amount of free iron circulating through the body is vanishingly small. PSI biology researchers are exploring the proteins that pathogenic bacteria use to gather scarce heme groups, and the iron ions they carry. Full Article | Archive | PSI Structural Biology Knowledgebase

   

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