SPACI score report for 1kw4 in ASTRAL 1.75:

PDB Entry: 1kw4
SPACI score: 0.65
AEROSPACI score: 0.65

Experiment type: XRAY
Resolution: 1.75
R-factor: 0.22
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.965
WCK2 WHAT_CHECK Ramachandran: 0.663
WCK3 WHAT_CHECK Chi angles: 1.168
WCK4 WHAT_CHECK Backbone: 1.143

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).