title: Biosynthesis of leupeptin. II Purification and properties of leupeptin acid synthetase.
abstract: An enzyme which condenses acetyl-L-leucyl-L-leucine and L-arginine into acetyl-L-leucyl-L-leucyl-L-leucyl-L-arginine (leupeptin acid) was partially purified from a cell extract of Streptomyces roseus MA839-A1. With respect to this catalytic activity, the enzyme showed the following characteristics: ATP is essential; optimum pH is 9.5; the activity is inhibited either by EDTA or pyrophosphate or N-ethylmaleimide. The molecular weight of the enzyme is about 260,000 daltons. It also catalyzes some other extension reactions, such as, acetyl-L-leucine+L-leucine+L-arginine leads to leupeptin acid, and acetyl-L-leucine+L-leucine leads to acetyl-L-leucyl-L-leucine, but neither L-leucine+L-arginine leads to (L-leucyl)1--2-L-argining, nor acetyl-L-leucine+L-arginine leads to acetyl-L-leucyl-L-arginine. ATP-PPi exchange, catalyzed by this enzyme, proceeds with either acetyl-L-leucine, or acetyl-L-leucyl-L-leucine or L-leucine, but not with acetate or arginine.
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D001120:Arginine / Q000378:metabolism; D002457:Cell Extracts / Q000378:metabolism; D004355:Drug Stability; D004492:Edetic Acid / Q000494:pharmacology; D004791:Enzyme Inhibitors; D006863:Hydrogen-Ion Concentration; D007930:Leucine / Q000378:metabolism; D007976:Leupeptins / Q000096:biosynthesis; D008970:Molecular Weight; D010443:Peptide Chain Termination, Translational; D010453:Peptide Synthases / Q000302:isolation & purification* / Q000378:metabolism; D013302:Streptomyces / Q000201:enzymology
chemical_list: D002457:Cell Extracts; D004791:Enzyme Inhibitors; D007976:Leupeptins; D000255:Adenosine Triphosphate; D001120:Arginine; D004492:Edetic Acid; D010453:Peptide Synthases; D007930:Leucine