SPACI score report for 3k5g in ASTRAL 2.04:

PDB Entry: 3k5g
SPACI score: 0.43
AEROSPACI score: 0.43

Experiment type: XRAY
Resolution: 2
R-factor: 0.207
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.956
WCK2 WHAT_CHECK Ramachandran: -1.272
WCK3 WHAT_CHECK Chi angles: 0.39
WCK4 WHAT_CHECK Backbone: -0.94

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).