SPACI score report for 1nxk in ASTRAL 2.07:

PDB Entry: 1nxk
SPACI score: 0.21
AEROSPACI score: 0.21

Experiment type: XRAY
Resolution: 2.7
R-factor: 0.239
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.252
WCK2 WHAT_CHECK Ramachandran: -3.076
WCK3 WHAT_CHECK Chi angles: -3.498
WCK4 WHAT_CHECK Backbone: 2.403

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).