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(-) Description

Title :  C4ADG FRAGMENT OF HUMAN COMPLEMENT FACTOR C4A
 
Authors :  J. M. H. Van Den Elsen, A. Martin, V. Wong, L. Clemenza, D. R. Rose, D. E. Isenman
Date :  24 Jan 01  (Deposition) - 09 Oct 02  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.30
Chains :  Asym./Biol. Unit :  A
Keywords :  Alpha-Alpha 6 Barrel, Immune System (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  J. M. Van Den Elsen, A. Martin, V. Wong, L. Clemenza, D. R. Rose, D. E. Isenman
X-Ray Crystal Structure Of The C4D Fragment Of Human Complement Component C4.
J. Mol. Biol. V. 322 1103 2002
PubMed-ID: 12367531  |  Reference-DOI: 10.1016/S0022-2836(02)00854-9
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - COMPLEMENT FACTOR C4A
    ChainsA
    EC Number3.4.21.43
    EngineeredYES
    Expression SystemESCHERICHIA COLI BL21
    Expression System PlasmidPSVC4A
    Expression System StrainBL21
    Expression System Taxid511693
    Expression System Vector TypePLASMID
    FragmentC4ADG
    GeneC4HU
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606

 Structural Features

(-) Chains, Units

  1
Asymmetric/Biological Unit A

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (1, 5)

Asymmetric/Biological Unit (1, 5)
No.NameCountTypeFull Name
1MSE5Mod. Amino AcidSELENOMETHIONINE

(-) Sites  (0, 0)

(no "Site" information available for 1HZF)

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 1HZF)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 1HZF)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (11, 11)

Asymmetric/Biological Unit (11, 11)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
01UniProtVAR_023731G1073DCO4B_HUMANPolymorphism2258218AD1054D
02UniProtVAR_069158D1073GCO4A_HUMANPolymorphism147162052AD1054G
03UniProtVAR_023732S1176NCO4B_HUMANPolymorphism2746414AS1157N
04UniProtVAR_069159N1176SCO4A_HUMANPolymorphism17874654AS1157S
05UniProtVAR_001992T1201SCO4A_HUMANPolymorphism  ---AT1182S
06UniProtVAR_001993V1207ACO4A_HUMANPolymorphism28357075AA1188A
07UniProtVAR_023734A1207VCO4B_HUMANPolymorphism200888163AA1188V
08UniProtVAR_023735R1210LCO4B_HUMANPolymorphism112683215AR1191L
09UniProtVAR_001994L1210RCO4A_HUMANPolymorphism28357076AR1191R
10UniProtVAR_001995S1286ACO4A_HUMANPolymorphism201016130AS1267A
11UniProtVAR_069161I1317FCO4B_HUMANPolymorphism2023616AI1298F

  SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

(-) PROSITE Motifs  (1, 1)

Asymmetric/Biological Unit (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1ALPHA_2_MACROGLOBULINPS00477 Alpha-2-macroglobulin family thiolester region signature.CO4A_HUMAN1007-1015  1A:988-996
CO4B_HUMAN1007-1015  1A:988-996

(-) Exons   (7, 7)

Asymmetric/Biological Unit (7, 7)
 ENSEMBLUniProtKBPDB
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength
1.98ENST0000037517798ENSE00001679291HSCHR6_MHC_SSTO:31974391-31974539149CO4B_HUMAN1-22220--
1.99ENST0000037517799ENSE00001592227HSCHR6_MHC_SSTO:31974672-31974870199CO4B_HUMAN22-88670--
1.100aENST00000375177100aENSE00001633686HSCHR6_MHC_SSTO:31975085-31975286202CO4B_HUMAN89-156680--
1.101dENST00000375177101dENSE00001649954HSCHR6_MHC_SSTO:31975496-3197556671CO4B_HUMAN156-179240--
1.101hENST00000375177101hENSE00001732960HSCHR6_MHC_SSTO:31975645-3197573389CO4B_HUMAN180-209300--
1.101kENST00000375177101kENSE00001752127HSCHR6_MHC_SSTO:31975952-3197603483CO4B_HUMAN209-237290--
1.102ENST00000375177102ENSE00001621592HSCHR6_MHC_SSTO:31976205-3197630197CO4B_HUMAN237-269330--
1.103ENST00000375177103ENSE00001764129HSCHR6_MHC_SSTO:31976440-31976545106CO4B_HUMAN269-304360--
1.104bENST00000375177104bENSE00001691554HSCHR6_MHC_SSTO:31976643-31976775133CO4B_HUMAN305-349450--
1.111aENST00000375177111aENSE00001783823HSCHR6_MHC_SSTO:31983559-31983674116CO4B_HUMAN349-387390--
1.111dENST00000375177111dENSE00001675664HSCHR6_MHC_SSTO:31983774-31983953180CO4B_HUMAN388-447600--
1.112aENST00000375177112aENSE00001679195HSCHR6_MHC_SSTO:31984099-31984281183CO4B_HUMAN448-508610--
1.113bENST00000375177113bENSE00001645785HSCHR6_MHC_SSTO:31984414-31984599186CO4B_HUMAN509-570620--
1.114aENST00000375177114aENSE00001759651HSCHR6_MHC_SSTO:31984753-31984911159CO4B_HUMAN571-623530--
1.115ENST00000375177115ENSE00001728536HSCHR6_MHC_SSTO:31985163-31985289127CO4B_HUMAN624-666430--
1.116ENST00000375177116ENSE00001774812HSCHR6_MHC_SSTO:31985457-3198553175CO4B_HUMAN666-691260--
1.117ENST00000375177117ENSE00001746718HSCHR6_MHC_SSTO:31985792-31985989198CO4B_HUMAN691-757670--
1.118aENST00000375177118aENSE00001723324HSCHR6_MHC_SSTO:31986081-31986192112CO4B_HUMAN757-794380--
1.118cENST00000375177118cENSE00001639698HSCHR6_MHC_SSTO:31986283-3198635371CO4B_HUMAN794-818250--
1.119ENST00000375177119ENSE00001691898HSCHR6_MHC_SSTO:31986612-31986751140CO4B_HUMAN818-864470--
1.120ENST00000375177120ENSE00001611231HSCHR6_MHC_SSTO:31986865-31987074210CO4B_HUMAN865-934700--
1.121ENST00000375177121ENSE00001721488HSCHR6_MHC_SSTO:31987319-3198737052CO4B_HUMAN935-952180--
1.122aENST00000375177122aENSE00001718751HSCHR6_MHC_SSTO:31987472-3198756190CO4B_HUMAN952-982310--
1.123aENST00000375177123aENSE00001623042HSCHR6_MHC_SSTO:31987697-31987906210CO4B_HUMAN982-1052711A:977-103357
1.124ENST00000375177124ENSE00001608111HSCHR6_MHC_SSTO:31988086-3198816176CO4B_HUMAN1052-1077261A:1033-105826
1.125ENST00000375177125ENSE00001649318HSCHR6_MHC_SSTO:31988322-31988478157CO4B_HUMAN1077-1129531A:1058-111053
1.126ENST00000375177126ENSE00001674847HSCHR6_MHC_SSTO:31988574-31988690117CO4B_HUMAN1130-1168391A:1111-114939
1.127ENST00000375177127ENSE00001649290HSCHR6_MHC_SSTO:31988796-31988967172CO4B_HUMAN1169-1226581A:1150-120758
1.128aENST00000375177128aENSE00001605574HSCHR6_MHC_SSTO:31989196-31989428233CO4B_HUMAN1226-1303781A:1207-1284 (gaps)78
1.129ENST00000375177129ENSE00001767709HSCHR6_MHC_SSTO:31989511-31989678168CO4B_HUMAN1304-1359561A:1285-130218
1.130aENST00000375177130aENSE00001601867HSCHR6_MHC_SSTO:31990072-3199013160CO4B_HUMAN1360-1379200--
1.131bENST00000375177131bENSE00001709807HSCHR6_MHC_SSTO:31991181-3199127494CO4B_HUMAN1380-1411320--
1.132aENST00000375177132aENSE00001732532HSCHR6_MHC_SSTO:31991372-31991558187CO4B_HUMAN1411-1473630--
1.132eENST00000375177132eENSE00001662923HSCHR6_MHC_SSTO:31991673-3199176391CO4B_HUMAN1473-1503310--
1.132gENST00000375177132gENSE00001794518HSCHR6_MHC_SSTO:31991854-3199192875CO4B_HUMAN1504-1528250--
1.136cENST00000375177136cENSE00001595537HSCHR6_MHC_SSTO:31993420-31993522103CO4B_HUMAN1529-1563350--
1.137cENST00000375177137cENSE00001783972HSCHR6_MHC_SSTO:31993688-3199377790CO4B_HUMAN1563-1593310--
1.137eENST00000375177137eENSE00001661549HSCHR6_MHC_SSTO:31993863-3199396199CO4B_HUMAN1593-1626340--
1.137hENST00000375177137hENSE00001778876HSCHR6_MHC_SSTO:31994144-3199422784CO4B_HUMAN1626-1654290--
1.137mENST00000375177137mENSE00001727043HSCHR6_MHC_SSTO:31994490-31994622133CO4B_HUMAN1654-1698450--
1.138bENST00000375177138bENSE00001868594HSCHR6_MHC_SSTO:31994766-31995048283CO4B_HUMAN1698-1744470--

(-) Sequences/Alignments

Asymmetric/Biological Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
SAPs(SNPs) PROSITE motifs Exons
(details for a mapped element are shown in a popup box when the mouse pointer rests over it)
Chain A from PDB  Type:PROTEIN  Length:302
 aligned with CO4A_HUMAN | P0C0L4 from UniProtKB/Swiss-Prot  Length:1744

    Alignment length:326
                                  1005      1015      1025      1035      1045      1055      1065      1075      1085      1095      1105      1115      1125      1135      1145      1155      1165      1175      1185      1195      1205      1215      1225      1235      1245      1255      1265      1275      1285      1295      1305      1315      
          CO4A_HUMAN    996 SPGGVASLLRLPRGCGEQTMIYLAPTLAASRYLDKTEQWSTLPPETKDHAVDLIQKGYMRIQQFRKADGSYAAWLSRDSSTWLTAFVLKVLSLAQEQVGGSPEKLQETSNWLLSQQQADGSFQDPCPVLDRSMQGGLVGNDETVALTAFVTIALHHGLAVFQDEGAEPLKQRVEASISKANSFLGEKASAGLLGAHAAAITAYALTLTKAPVDLLGVAHNNLMAMAQETGDNLYWGSVTGSQSNAVSPTPAPRNPSDPMPQAPALWIETTAYALLHLLLHEGKAEMADQASAWLTRQGSFQGGFRSTQDTVIALDALSAYWIASHT 1321
               SCOP domains d1hzfa_ A: C4adg fragment of complement factor C4a                                                                                                                                                                                                                                                                                     SCOP domains
               CATH domains 1hzfA00 A:977-1302  [code=1.50.10.20, no name defined]                                                                                                                                                                                                                                                                                 CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author hhhhhhh.......hhhhhhhhhhhhhhhhhhhhhh........hhhhhhhhhhhhhhhhhhh................hhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhh................hhhhhhhhh..hhhhhhhhhhhhhhhhhhh......hhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhh..hhhhhhhhhhhhhh..ee....ee..------------------------..hhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhh.......hhhhhhhhhhhhhhhhhhhh. Sec.struct. author
             SAPs(SNPs) (1) -----------------------------------------------------------------------------D------------------------------------------------------------------------------------------------------N------------------------S-----A--L---------------------------------------------------------------------------A------------------------------F---- SAPs(SNPs) (1)
             SAPs(SNPs) (2) -----------------------------------------------------------------------------G------------------------------------------------------------------------------------------------------S------------------------------V--R--------------------------------------------------------------------------------------------------------------- SAPs(SNPs) (2)
                    PROSITE -----------ALPHA_2_M------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                1hzf A  977 SPGGVASLLRLPRGCGEQTmIYLAPTLAASRYLDKTEQWSTLPPETKDHAVDLIQKGYMRIQQFRKADGSYAAWLSRDSSTWLTAFVLKVLSLAQEQVGGSPEKLQETSNWLLSQQQADGSFQDPCPVLDRSmQGGLVGNDETVALTAFVTIALHHGLAVFQDEGAEPLKQRVEASISKASSFLGEKASAGLLGAHAAAITAYALTLTKAPADLRGVAHNNLmAmAQETGDNLYWG------------------------QAPALWIETTAYALLHLLLHEGKAEmADQASAWLTRQGSFQGGFRSTQDTVIALDALSAYWIASHT 1302
                                   986       996      1006      1016      1026      1036      1046      1056      1066      1076      1086      1096      1106  |   1116      1126      1136      1146      1156      1166      1176      1186      1196  | | 1206     |   -         -         -|     1246      1256     |1266      1276      1286      1296      
                                             996-MSE                                                                                                         1109-MSE                                                                                  1199-MSE     1212                     1237                     1262-MSE                                    
                                                                                                                                                                                                                                                         1201-MSE                                                                                                 

Chain A from PDB  Type:PROTEIN  Length:302
 aligned with CO4B_HUMAN | P0C0L5 from UniProtKB/Swiss-Prot  Length:1744

    Alignment length:326
                                  1005      1015      1025      1035      1045      1055      1065      1075      1085      1095      1105      1115      1125      1135      1145      1155      1165      1175      1185      1195      1205      1215      1225      1235      1245      1255      1265      1275      1285      1295      1305      1315      
          CO4B_HUMAN    996 SPGGVASLLRLPRGCGEQTMIYLAPTLAASRYLDKTEQWSTLPPETKDHAVDLIQKGYMRIQQFRKADGSYAAWLSRGSSTWLTAFVLKVLSLAQEQVGGSPEKLQETSNWLLSQQQADGSFQDLSPVIHRSMQGGLVGNDETVALTAFVTIALHHGLAVFQDEGAEPLKQRVEASISKASSFLGEKASAGLLGAHAAAITAYALTLTKAPADLRGVAHNNLMAMAQETGDNLYWGSVTGSQSNAVSPTPAPRNPSDPMPQAPALWIETTAYALLHLLLHEGKAEMADQAAAWLTRQGSFQGGFRSTQDTVIALDALSAYWIASHT 1321
               SCOP domains d1hzfa_ A: C4adg fragment of complement factor C4a                                                                                                                                                                                                                                                                                     SCOP domains
               CATH domains 1hzfA00 A:977-1302  [code=1.50.10.20, no name defined]                                                                                                                                                                                                                                                                                 CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author hhhhhhh.......hhhhhhhhhhhhhhhhhhhhhh........hhhhhhhhhhhhhhhhhhh................hhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhh................hhhhhhhhh..hhhhhhhhhhhhhhhhhhh......hhhhhhhhhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhh..hhhhhhhhhhhhhh..ee....ee..------------------------..hhhhhhhhhhhhhhhhhhh..hhhhhhhhhhhhhhh.......hhhhhhhhhhhhhhhhhhhh. Sec.struct. author
             SAPs(SNPs) (1) -----------------------------------------------------------------------------D------------------------------------------------------------------------------------------------------N------------------------S-----A--L---------------------------------------------------------------------------A------------------------------F---- SAPs(SNPs) (1)
             SAPs(SNPs) (2) -----------------------------------------------------------------------------G------------------------------------------------------------------------------------------------------S------------------------------V--R--------------------------------------------------------------------------------------------------------------- SAPs(SNPs) (2)
                PROSITE (2) -----------ALPHA_2_M------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PROSITE (2)
           Transcript 1 (1) Exon 1.123a  PDB: A:977-1033 UniProt: 982-1052           ------------------------Exon 1.125  PDB: A:1058-1110 UniProt: 1077-1129      Exon 1.126  PDB: A:1111-1149           Exon 1.127  PDB: A:1150-1207 UniProt: 1169-1226           -----------------------------------------------------------------------------Exon 1.129         Transcript 1 (1)
           Transcript 1 (2) --------------------------------------------------------Exon 1.124                ----------------------------------------------------------------------------------------------------------------------------------------------------Exon 1.128a  PDB: A:1207-1284 (gaps) UniProt: 1226-1303                       ------------------ Transcript 1 (2)
                1hzf A  977 SPGGVASLLRLPRGCGEQTmIYLAPTLAASRYLDKTEQWSTLPPETKDHAVDLIQKGYMRIQQFRKADGSYAAWLSRDSSTWLTAFVLKVLSLAQEQVGGSPEKLQETSNWLLSQQQADGSFQDPCPVLDRSmQGGLVGNDETVALTAFVTIALHHGLAVFQDEGAEPLKQRVEASISKASSFLGEKASAGLLGAHAAAITAYALTLTKAPADLRGVAHNNLmAmAQETGDNLYWG------------------------QAPALWIETTAYALLHLLLHEGKAEmADQASAWLTRQGSFQGGFRSTQDTVIALDALSAYWIASHT 1302
                                   986       996      1006      1016      1026      1036      1046      1056      1066      1076      1086      1096      1106  |   1116      1126      1136      1146      1156      1166      1176      1186      1196  | | 1206     |   -         -         -|     1246      1256     |1266      1276      1286      1296      
                                             996-MSE                                                                                                         1109-MSE                                                                                  1199-MSE     1212                     1237                     1262-MSE                                    
                                                                                                                                                                                                                                                         1201-MSE                                                                                                 

   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (1, 1)

Asymmetric/Biological Unit

(-) CATH Domains  (1, 1)

Asymmetric/Biological Unit

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 1HZF)

(-) Gene Ontology  (22, 38)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A   (CO4A_HUMAN | P0C0L4)
molecular function
    GO:0001849    complement component C1q binding    Interacting selectively and non-covalently with the C1q component of the classical complement cascade.
    GO:0004866    endopeptidase inhibitor activity    Stops, prevents or reduces the activity of an endopeptidase, any enzyme that hydrolyzes nonterminal peptide bonds in polypeptides.
    GO:0004252    serine-type endopeptidase activity    Catalysis of the hydrolysis of internal, alpha-peptide bonds in a polypeptide chain by a catalytic mechanism that involves a catalytic triad consisting of a serine nucleophile that is activated by a proton relay involving an acidic residue (e.g. aspartate or glutamate) and a basic residue (usually histidine).
biological process
    GO:0006956    complement activation    Any process involved in the activation of any of the steps of the complement cascade, which allows for the direct killing of microbes, the disposal of immune complexes, and the regulation of other immune processes; the initial steps of complement activation involve one of three pathways, the classical pathway, the alternative pathway, and the lectin pathway, all of which lead to the terminal complement pathway.
    GO:0006958    complement activation, classical pathway    Any process involved in the activation of any of the steps of the classical pathway of the complement cascade which allows for the direct killing of microbes, the disposal of immune complexes, and the regulation of other immune processes.
    GO:0002376    immune system process    Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats.
    GO:0006954    inflammatory response    The immediate defensive reaction (by vertebrate tissue) to infection or injury caused by chemical or physical agents. The process is characterized by local vasodilation, extravasation of plasma into intercellular spaces and accumulation of white blood cells and macrophages.
    GO:0045087    innate immune response    Innate immune responses are defense responses mediated by germline encoded components that directly recognize components of potential pathogens.
    GO:0010951    negative regulation of endopeptidase activity    Any process that decreases the frequency, rate or extent of endopeptidase activity, the endohydrolysis of peptide bonds within proteins.
    GO:2000427    positive regulation of apoptotic cell clearance    Any process that activates or increases the frequency, rate or extent of apoptotic cell clearance.
    GO:0006508    proteolysis    The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
    GO:0030449    regulation of complement activation    Any process that modulates the frequency, rate or extent of complement activation.
cellular component
    GO:0072562    blood microparticle    A phospholipid microvesicle that is derived from any of several cell types, such as platelets, blood cells, endothelial cells, or others, and contains membrane receptors as well as other proteins characteristic of the parental cell. Microparticles are heterogeneous in size, and are characterized as microvesicles free of nucleic acids.
    GO:0070062    extracellular exosome    A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.
    GO:0005576    extracellular region    The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.
    GO:0005615    extracellular space    That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.
    GO:0005886    plasma membrane    The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

Chain A   (CO4B_HUMAN | P0C0L5)
molecular function
    GO:0030246    carbohydrate binding    Interacting selectively and non-covalently with any carbohydrate, which includes monosaccharides, oligosaccharides and polysaccharides as well as substances derived from monosaccharides by reduction of the carbonyl group (alditols), by oxidation of one or more hydroxy groups to afford the corresponding aldehydes, ketones, or carboxylic acids, or by replacement of one or more hydroxy group(s) by a hydrogen atom. Cyclitols are generally not regarded as carbohydrates.
    GO:0001848    complement binding    Interacting selectively and non-covalently with any component or product of the complement cascade.
    GO:0004866    endopeptidase inhibitor activity    Stops, prevents or reduces the activity of an endopeptidase, any enzyme that hydrolyzes nonterminal peptide bonds in polypeptides.
    GO:0004252    serine-type endopeptidase activity    Catalysis of the hydrolysis of internal, alpha-peptide bonds in a polypeptide chain by a catalytic mechanism that involves a catalytic triad consisting of a serine nucleophile that is activated by a proton relay involving an acidic residue (e.g. aspartate or glutamate) and a basic residue (usually histidine).
biological process
    GO:0006956    complement activation    Any process involved in the activation of any of the steps of the complement cascade, which allows for the direct killing of microbes, the disposal of immune complexes, and the regulation of other immune processes; the initial steps of complement activation involve one of three pathways, the classical pathway, the alternative pathway, and the lectin pathway, all of which lead to the terminal complement pathway.
    GO:0006958    complement activation, classical pathway    Any process involved in the activation of any of the steps of the classical pathway of the complement cascade which allows for the direct killing of microbes, the disposal of immune complexes, and the regulation of other immune processes.
    GO:0032490    detection of molecule of bacterial origin    The series of events in which a stimulus from a molecule of bacterial origin is received and converted into a molecular signal.
    GO:0002376    immune system process    Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats.
    GO:0006954    inflammatory response    The immediate defensive reaction (by vertebrate tissue) to infection or injury caused by chemical or physical agents. The process is characterized by local vasodilation, extravasation of plasma into intercellular spaces and accumulation of white blood cells and macrophages.
    GO:0045087    innate immune response    Innate immune responses are defense responses mediated by germline encoded components that directly recognize components of potential pathogens.
    GO:0010951    negative regulation of endopeptidase activity    Any process that decreases the frequency, rate or extent of endopeptidase activity, the endohydrolysis of peptide bonds within proteins.
    GO:0008228    opsonization    The process in which a microorganism (or other particulate material) is rendered more susceptible to phagocytosis by coating with an opsonin, a blood serum protein such as a complement component or antibody.
    GO:2000427    positive regulation of apoptotic cell clearance    Any process that activates or increases the frequency, rate or extent of apoptotic cell clearance.
    GO:0006508    proteolysis    The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
    GO:0030449    regulation of complement activation    Any process that modulates the frequency, rate or extent of complement activation.
cellular component
    GO:0072562    blood microparticle    A phospholipid microvesicle that is derived from any of several cell types, such as platelets, blood cells, endothelial cells, or others, and contains membrane receptors as well as other proteins characteristic of the parental cell. Microparticles are heterogeneous in size, and are characterized as microvesicles free of nucleic acids.
    GO:0070062    extracellular exosome    A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.
    GO:0005576    extracellular region    The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.
    GO:0005615    extracellular space    That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.
    GO:0044216    other organism cell    A cell of a secondary organism with which the first organism is interacting.
    GO:0005886    plasma membrane    The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

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(-) Entries Sharing at Least One Protein Chain (UniProt ID)

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        CO4A_HUMAN | P0C0L44fxg 4fxk 4xam 5jpm 5jpn 5jtw
        CO4B_HUMAN | P0C0L54xam

(-) Related Entries Specified in the PDB File

1c3d CRYSTAL STRUCTURE OF THE C3D FRAGMENT OF HUMAN COMPLEMENT FACTOR C3