SPACI score report for 1a53 in ASTRAL 1.55:

PDB Entry: 1a53
SPACI score: 0.48
AEROSPACI score: 0.48

Experiment type: XRAY
Resolution: 2
R-factor: 0.159
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 4.596
WCK2 WHAT_CHECK Ramachandran: 0.489
WCK3 WHAT_CHECK Chi angles: 0.297
WCK4 WHAT_CHECK Backbone: 0.691

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).