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. Author manuscript; available in PMC: 2005 Oct 5.
Published in final edited form as: J Biol Chem. 2005 May 24;280(28):26099–26104. doi: 10.1074/jbc.M503539200

Table III.

Steady-state aminoacylation kinetics of M. thermautotrophicus ProRS

Enzymea Additionsb Km Pro Km tRNAPro kcat kcat/Km tRNA (relative)
μm μm s1
ProRS None NDc 4.1 ± 0.9 1.8 ± 0.2 1
ProRS LeuRS ND 2.2 ± 0.6 5.1 ± 0.4 5
ProRS BSA 67 ± 10 2.4 ± 0.4 2.9 ± 0.1 3
ProRS LeuRS, BSA 61 ± 17 1.4 ± 0.1 6.9 ± 0.2 12
a

Enzymes were added at a final concentration of 40 nm.

b

Other components at 400 nm each.

c

ND, not determined.