Abstract
L-amino acids containing oxygen-18 at the carboxyl moiety have been found to undergo rapid loss of the stable isotope label through exchange with water in the presence of erythrocytes. This back exchange was found to be temperature dependent, stereo-specific, and dependent on intact cells. The results suggest that an erythrocyte system catalyzes the formation of an intermediate which adds water to the labeled acid. This system has many characteristics similar to amino acid transport.
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