SPACI score report for 2a22 in ASTRAL 2.05:

PDB Entry: 2a22
SPACI score: 0.41
AEROSPACI score: 0.41

Experiment type: XRAY
Resolution: 2.2
R-factor: 0.17
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.958
WCK2 WHAT_CHECK Ramachandran: 0.416
WCK3 WHAT_CHECK Chi angles: -0.962
WCK4 WHAT_CHECK Backbone: -0.625

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).