Amino acids differential responses

Gardette R, Krupa M, Crepel F Differential effects of serotonin on the spontaneous discharge and on the excitatory amino acid-induced responses of deep cerebellar nuclei neurones in rat cerebellar slices. Neuroscience 23 491-500, 1987... 

It has been well-established that certain amino acids, i.e., phenylalanine, tyrosine, and tryptophan, both fluoresce and phosphoresce (15.). We believe that a combination of these amino acids is responsible for the observed luminescence of seminal fluid. Furthermore, it seems reasonable that either this combination of amino acids would not be present or would not occur in the same proportions in other body fluids or substances of biological origin. Therefore, differentiation between seminal fluid and... 

Based on the amino acid sequences, two classes of C4H have been described for some species, with around 60% sequence similarity between the groups. The first sequence for the class II type was reported from Phaseolus vulgaris (French bean), ° but they have also been found in other species (see, e.g.. Ref. 21). The two C4H types differ at both terminal domains and in three internal domains, and it has been suggested that one type may be involved in stress responses and the other in vascular differentiation. ... 

A related receptor based upon a chiral, resolved Zn(ll) porphyrin complex has been shown to differentiate between enantiomers of a range of substituted amino acids with selectivity of up to 96% for L-benzyloxycarbonylvalinate. The combination of metal coordination and hydrogen-bonding interactions are again responsible for the observed selectivity." ... 

Ion-exchange resins exist that have differential binding affinities for all the naturally occurring amino acids. Such resins are effective in separating a solution of amino acids into its components. We must emphasize that the details of the forces responsible for the differential binding of amino acids to an ion-exchange resin are quite complicated and depend additionally on side-chain polarity, on subtle... 

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