SPACI score report for 2aj9 in ASTRAL 2.06:

PDB Entry: 2aj9
SPACI score: 0.28
AEROSPACI score: 0.28 (mutant; see below)

Experiment type: XRAY
Resolution: 2.5
R-factor: 0.225
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.431
WCK2 WHAT_CHECK Ramachandran: -2.998
WCK3 WHAT_CHECK Chi angles: -3.377
WCK4 WHAT_CHECK Backbone: -0.975

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; automatically matched to d1hzpa1; automatically matched to d1hzpa2; automated match to d2qnza1; automated match to d1hzpa2"

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).