SPACI score report for 1kxo in ASTRAL 2.04:

PDB Entry: 1kxo
SPACI score: 0.46
AEROSPACI score: 0.46 (mutant; see below)

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.212
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.816
WCK2 WHAT_CHECK Ramachandran: -1.346
WCK3 WHAT_CHECK Chi angles: -2.277
WCK4 WHAT_CHECK Backbone: -1.081

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase mutant. The full comment is: "engineered variant diga16; mutant"

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).