The presence of essential arginine residues at the active sites of citrate lyase complex from Klebsiella aerogenes |
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Authors: | Subhalakshmi Subramanian Amaresh Basu Churya Sivaraman |
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Institution: | Biochemistry Division, National Chemical Laboratory Poona - 411 008; India |
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Abstract: | The acyl-transferase and acyl-lyase activities of citrate lyase complex are inactivated by the arginine specific reagents phenylglyoxal and 2,3-butanedione, the former reagent being the more potent inhibitor. Citrate and (3)-citryl-CoA protect the transferase activity, while acetyl-CoA markedly enhances the rate of the inactivation. (3)-Citryl-CoA protects the lyase subunit in the complex from inactivation. The kinetics of inactivation suggest the involvement of a single arginine residue at each of the active sites of the transferase and of the lyase subunits. |
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Keywords: | ACP acyl carrier protein Hepes 4-(2-hydroxyethyl)-1-piperazine-ethanesulfonic acid |
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