SPACI score report for 2c51 in ASTRAL 2.06:

PDB Entry: 2c51
SPACI score: 0.31
AEROSPACI score: 0.31 (mutant; see below)

Experiment type: XRAY
Resolution: 2.8
R-factor: 0.185
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.422
WCK2 WHAT_CHECK Ramachandran: -1.163
WCK3 WHAT_CHECK Chi angles: -1.426
WCK4 WHAT_CHECK Backbone: 0.045

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase mutant. The full comment is: "mutant; automatically matched to d1dzsa_; automated match to d1dzsa_"

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).