A study of lysyl-ribonucleic acid synthetase in relation to substrate conformation

Add time:08/30/2019    Source:sciencedirect.com

The substrate specificity of a purified lysyl-ribonucleic acid synthetase of Escherichia coli 9723 has been studied by determining the effects of a group of lysine analogs upon (a) the enzymic transfer of lysine-14C to soluble ribonucleic acid and (b) lysine-dependent ATP-pyrophosphate exchange. At relatively high levels, 4-oxalysine, 2,6-diamino-4-hexynoic acid, and trans-4-dehydrolysine (but not cis-4-dehydrolysine) replace lysine in catalyzing the exchange reaction. Oxalysine, 2,6-diamino-4-hexynoic acid, and trans-dehydrolysine inhibit enzymic transfer of lysine to soluble ribonucleic acid; the cis-isomer also inhibits lysine utilization but is less effective than the trans-isomer and other analogues. Thus the activation of lysine appears to require a conformation in which the 3 and 6 carbons are in a trans-like position, but binding with the enzyme can occur with other conformations.

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