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3D4A

Crystal structure of ribonuclease Sa2 with 3'-GMP obtained by ligand diffusion

Functional Information from GO Data
ChainGOidnamespacecontents
A0003723molecular_functionRNA binding
A0004521molecular_functionRNA endonuclease activity
A0004540molecular_functionRNA nuclease activity
B0003723molecular_functionRNA binding
B0004521molecular_functionRNA endonuclease activity
B0004540molecular_functionRNA nuclease activity
C0003723molecular_functionRNA binding
C0004521molecular_functionRNA endonuclease activity
C0004540molecular_functionRNA nuclease activity
Functional Information from PDB Data
site_idAC1
Number of Residues7
DetailsBINDING SITE FOR RESIDUE SO4 A 98
ChainResidue
AARG34
AGLU56
AARG67
AARG71
AHIS86
ATYR87
CARG45

site_idAC2
Number of Residues4
DetailsBINDING SITE FOR RESIDUE SO4 B 98
ChainResidue
BGLU43
BARG45
ASER15
AHOH139

site_idAC3
Number of Residues12
DetailsBINDING SITE FOR RESIDUE 3GP B 99
ChainResidue
BVAL37
BVAL38
BPHE39
BGLU40
BASN41
BARG42
BGLU43
BGLU56
BARG67
BARG71
BHIS86
BTYR87

Catalytic Information from CSA
site_idCSA1
Number of Residues3
DetailsAnnotated By Reference To The Literature 1c54
ChainResidueDetails
AGLU56
AHIS86
AARG67

site_idCSA2
Number of Residues3
DetailsAnnotated By Reference To The Literature 1c54
ChainResidueDetails
BGLU56
BHIS86
BARG67

site_idCSA3
Number of Residues3
DetailsAnnotated By Reference To The Literature 1c54
ChainResidueDetails
CGLU56
CHIS86
CARG67

site_idMCSA1
Number of Residues4
DetailsM-CSA 459
ChainResidueDetails
AGLU56proton shuttle (general acid/base)
AARG67activator, transition state stabiliser
AARG71activator, transition state stabiliser
AHIS86proton shuttle (general acid/base)

site_idMCSA2
Number of Residues4
DetailsM-CSA 459
ChainResidueDetails
BGLU56proton shuttle (general acid/base)
BARG67activator, transition state stabiliser
BARG71activator, transition state stabiliser
BHIS86proton shuttle (general acid/base)

site_idMCSA3
Number of Residues4
DetailsM-CSA 459
ChainResidueDetails
CGLU56proton shuttle (general acid/base)
CARG67activator, transition state stabiliser
CARG71activator, transition state stabiliser
CHIS86proton shuttle (general acid/base)

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PDB entries from 2025-06-11

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