SPACI score report for 1nkp in ASTRAL 1.67:

PDB Entry: 1nkp
SPACI score: 0.52
AEROSPACI score: 0.52

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.219
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 4.183
WCK2 WHAT_CHECK Ramachandran: 1.664
WCK3 WHAT_CHECK Chi angles: 1.443
WCK4 WHAT_CHECK Backbone: 1.082

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).