MOST ABUNDANT. “Another contender for the title of most abundant protein is ACP, the Acyl carrier protein, which plays an important role in fatty acid biosynthesis. This protein carries fatty acid chains as the chains are elongated. It is claimed to be the most abundant protein in E. coli, with about 60,000 molecules per cell. In a recent high throughput mass spectrometry measurement on minimal medium, a value of ≈80,000 was reported making it the third most abundant protein reported.”
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