SPACI score report for 1bu0 in ASTRAL 2.08:

WARNING! The SPACI score for this entry is not valid. This is not an X-ray structure, so the resolution and R-factor listed may be arbitrary and not valid. The resolution is not available. An arbitrary resolution has been used. The R-factor is not available and an abitrary R-factor has been used. The PROCHECK parameters for this entry could not be obtained, and poor results have been arbitrarily assumed.

PDB Entry: 1bu0
SPACI score: -0.9 (not valid)
AEROSPACI score: -5.9 (not valid) (theory; see below)

Experiment type: THEORY
Resolution: 20
R-factor: 1
PCK1 PROCHECK Ramachandran: N/A
PCK2 PROCHECK Chi-1 angle: N/A
WCK1 WHAT_CHECK Packing: -0.459
WCK2 WHAT_CHECK Ramachandran: -2.795
WCK3 WHAT_CHECK Chi angles: -2.121
WCK4 WHAT_CHECK Backbone: -1.44

The AEROSPACI score for this entry is lower than the SPACI score because this structure is theoretical.

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).