Matrix of similar interfaces for 3D-footprint entry 3upu_A

_ stats: contacts=4 Nring=0 specif=-1.00
_ PDBs:  1:6s3h_A,
_ -lnE:  1:16.9,
_        1
0081 H  HT
0148 P  VT
0240 T  RT
0272 E  PT