SPACI score report for 1xac in ASTRAL 2.08:

PDB Entry: 1xac
SPACI score: 0.36
AEROSPACI score: 0.36 (mutant; see below)

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.2
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 3
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.352
WCK2 WHAT_CHECK Ramachandran: -4.549
WCK3 WHAT_CHECK Chi angles: -4.123
WCK4 WHAT_CHECK Backbone: -1.652

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: "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).