SPACI score report for 2z90 in ASTRAL 2.04:

PDB Entry: 2z90
SPACI score: 0.35
AEROSPACI score: 0.35

Experiment type: XRAY
Resolution: 2.4
R-factor: 0.187
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.165
WCK2 WHAT_CHECK Ramachandran: -0.677
WCK3 WHAT_CHECK Chi angles: -1.463
WCK4 WHAT_CHECK Backbone: 0.969

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).