SPACI score report for 4kqx in ASTRAL 2.03:

PDB Entry: 4kqx
SPACI score: 0.49
AEROSPACI score: 0.49

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.204
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.841
WCK2 WHAT_CHECK Ramachandran: -1.894
WCK3 WHAT_CHECK Chi angles: -1.835
WCK4 WHAT_CHECK Backbone: 4.324

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).