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1Q3X

Crystal structure of the catalytic region of human MASP-2

Functional Information from GO Data
ChainGOidnamespacecontents
A0004252molecular_functionserine-type endopeptidase activity
A0006508biological_processproteolysis
B0004252molecular_functionserine-type endopeptidase activity
B0006508biological_processproteolysis
Functional Information from PDB Data
site_idAC1
Number of Residues5
DetailsBINDING SITE FOR RESIDUE NA A 800
ChainResidue
ASER657
AASN659
AHOH804
AHOH805
AHOH806

site_idAC2
Number of Residues6
DetailsBINDING SITE FOR RESIDUE NA B 850
ChainResidue
BHOH855
BHOH1018
BASP627
BSER657
BASN659
BHOH854

site_idAC3
Number of Residues7
DetailsBINDING SITE FOR RESIDUE GOL A 700
ChainResidue
APRO432
ATYR474
APRO550
AILE551
ACYS552
ALEU553
AHOH900

site_idAC4
Number of Residues9
DetailsBINDING SITE FOR RESIDUE GOL A 701
ChainResidue
ASER628
ACYS629
AARG630
ASER633
AVAL653
ASER654
ATRP655
AHOH803
AHOH829

site_idAC5
Number of Residues3
DetailsBINDING SITE FOR RESIDUE GOL A 702
ChainResidue
APRO507
AHIS508
ATYR509

site_idAC6
Number of Residues6
DetailsBINDING SITE FOR RESIDUE GOL A 703
ChainResidue
ALEU553
AARG555
AASP641
ATHR644
AARG646
APHE648

site_idAC7
Number of Residues6
DetailsBINDING SITE FOR RESIDUE GOL B 750
ChainResidue
BPRO432
BTYR474
BPRO550
BILE551
BCYS552
BLEU553

site_idAC8
Number of Residues9
DetailsBINDING SITE FOR RESIDUE GOL B 751
ChainResidue
BSER628
BCYS629
BARG630
BSER633
BVAL653
BTRP655
BHOH851
BHOH853
BHOH883

site_idAC9
Number of Residues5
DetailsBINDING SITE FOR RESIDUE GOL B 754
ChainResidue
BTYR474
BASN476
BTRP477
BILE683
BPHE686

Functional Information from PROSITE/UniProt
site_idPS00135
Number of Residues12
DetailsTRYPSIN_SER Serine proteases, trypsin family, serine active site. DScrGDSGGALV
ChainResidueDetails
AASP627-VAL638

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues68
DetailsDomain: {"description":"Sushi 2","evidences":[{"source":"PROSITE-ProRule","id":"PRU00302","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI2
Number of Residues478
DetailsDomain: {"description":"Peptidase S1","evidences":[{"source":"PROSITE-ProRule","id":"PRU00274","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues4
DetailsActive site: {"description":"Charge relay system","evidences":[{"source":"PubMed","id":"15364579","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI4
Number of Residues2
DetailsActive site: {"description":"Charge relay system","evidences":[{"source":"PubMed","id":"15364579","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"23386610","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

Catalytic Information from CSA
site_idCSA1
Number of Residues3
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
AASP532
ASER633
AHIS483

site_idCSA2
Number of Residues3
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
BASP532
BSER633
BHIS483

site_idCSA3
Number of Residues4
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
AASP532
ASER633
AHIS483
AGLY631

site_idCSA4
Number of Residues4
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
BASP532
BSER633
BHIS483
BGLY631

site_idCSA5
Number of Residues4
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
AGLY634
AASP532
ASER633
AHIS483

site_idCSA6
Number of Residues4
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
BGLY634
BASP532
BSER633
BHIS483

site_idCSA7
Number of Residues5
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
AASP532
ASER633
AHIS483
ASER654
AGLY631

site_idCSA8
Number of Residues5
DetailsAnnotated By Reference To The Literature 1a0j
ChainResidueDetails
BASP532
BSER633
BHIS483
BSER654
BGLY631

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PDB entries from 2026-04-08

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