SPACI score report for 4ac4 in ASTRAL 2.03:

PDB Entry: 4ac4
SPACI score: 0.46
AEROSPACI score: 0.46

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.2224
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: 1.287
WCK2 WHAT_CHECK Ramachandran: -1.488
WCK3 WHAT_CHECK Chi angles: -1.612
WCK4 WHAT_CHECK Backbone: 3.143

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).