SPACI score report for 3bu8 in ASTRAL 2.07:

PDB Entry: 3bu8
SPACI score: 0.35
AEROSPACI score: 0.35

Experiment type: XRAY
Resolution: 2.15
R-factor: 0.238
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.378
WCK2 WHAT_CHECK Ramachandran: -1.203
WCK3 WHAT_CHECK Chi angles: -2.066
WCK4 WHAT_CHECK Backbone: 0.884

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).