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About: Hemolithin     Goto   Sponge   NotDistinct   Permalink

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Hemolithin (newly named Hemoglycin), a space polymer, is the first polymer of amino acids found in meteorites. Further structural work has determined that its core contains iron (Fe), but not lithium (Li), leading to the more general term hemoglycin for these molecules. The hemoglycin core contains a total of 22 glycine residues in an antiparallel beta sheet that is terminated at each end by an iron atom plus two oxygens. Four of these glycine residues are oxidized to hydroxy-glycine with OH groups on the alpha carbon. This structure was determined by mass spectrometry of meteoritic solvent extracts. and has been confirmed in X-ray scattering by crystals of hemoglycin, and also by optical absorption. Crystals show a 480 nm characteristic absorption that can only exist when hydroxyglycine r