Table 2.

First-shell parameters for the final EXAFS fits for AP and NPP protein samples for selected coordination numbers N.^a

	Zn-N/O
Sample	Nb	R (Å)c	σ2 × 103 (Å2)d
	AP-free	4	1.98	5.6
	AP-phosphate	4	1.97	5.8
AP-vanadate	4.5	2.00	6.4
NPP-free	4	1.97	4.0
NPP-AMP	4	1.97	4.0
NPP-vanadate	5	2.03	7.8

^aFitting parameters that were varied in each fit are denoted in italics.

^bAverage zinc coordination number, fixed at the best-fit values determined by bond-valence sum analysis.

^cAverage zinc-ligand distances. The estimated uncertainty in R is 0.02 Å.

^dBond variance values.