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proteinoid
Proteinoids, or thermal proteins, are protein-like, often cross-linked molecules formed abiotically from amino acids. A slightly altered definition of proteinoids is from Hayakawa et al. (1967): "''macromolecular preparations of mean molecular weights in the thousands, containing most of the twenty amino acids found in protein hydrolyzates. Although these polymers have other properties of contemporary protein as well, identity with the latter is not a necessary inference''".〔
Its discoverer, Sidney W. Fox proposed the hypothesis that proteinoids were a precursor to the first living cells (protocell).〔
==History==
In trying to uncover the intermediate stages of abiogenesis, scientist Sidney W. Fox in the 1950s and 1960s, studied the spontaneous formation of peptide structures under conditions that might plausibly have existed early in Earth's history. He demonstrated that amino acids could spontaneously form small chains called peptides. In one of his experiments, he allowed amino acids to dry out as if puddled in a warm, dry spot in prebiotic conditions. He found that, as they dried, the amino acids formed long, often cross-linked, thread-like microscopic polypeptide globules, he named "proteinoid microspheres".〔(Experiments on origin of organic molecules ). Retrieved 13 January 2008.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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