SPACI score report for 3kj4 in ASTRAL 2.07:

PDB Entry: 3kj4
SPACI score: 0.11
AEROSPACI score: 0.11

Experiment type: XRAY
Resolution: 3.1
R-factor: 0.256
PCK1 PROCHECK Ramachandran: 2
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.097
WCK2 WHAT_CHECK Ramachandran: -4.34
WCK3 WHAT_CHECK Chi angles: -5.141
WCK4 WHAT_CHECK Backbone: -2.245

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).