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. 2000 Sep 12;97(20):10701–10705. doi: 10.1073/pnas.170297297

Table 1.

Binding and dissociation rate constants for soluble scFvs

scFv Buffer kass (× 10−7 M−1·s−1) kdiss (× 106 s−1) Kd, fM
kdiss/kass Direct titration
4-4-20 PBS 8.0  ± 3.5 25,100  ± 500 310,000 700,000 ± 300,000
LSB 41.0  ± 8.0 4,270  ± 100 10,000 ND
4 M5.3 PBS 0.6  ± 0.03 1.6  ± 0.3 270 ND
LSB 2.9  ± 0.9 1.4  ± 0.4 48 ND

ND, not determined.