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UniProtKB - Q864W1 (CFAB_PONPY)

Entry version 97 (25 May 2022)
Sequence version 1 (01 Jun 2003)
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Protein

Complement factor B

Gene

CFB

Organism
Pongo pygmaeus (Bornean orangutan)
Status
Reviewed-Annotation score:

Annotation score:3 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>-Protein inferred from homologyi <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Factor B which is part of the alternate pathway of the complement system is cleaved by factor D into 2 fragments: Ba and Bb. Bb, a serine protease, then combines with complement factor 3b to generate the C3 or C5 convertase. It has also been implicated in proliferation and differentiation of preactivated B-lymphocytes, rapid spreading of peripheral blood monocytes, stimulation of lymphocyte blastogenesis and lysis of erythrocytes. Ba inhibits the proliferation of preactivated B-lymphocytes (By similarity).

By similarity

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

  • Cleavage of Arg-|-Ser bond in complement component C3 alpha-chain to yield C3a and C3b, and Arg-|-Xaa bond in complement component C5 alpha-chain to yield C5a and C5b. EC:3.4.21.47

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section is used for enzymes and indicates the residues directly involved in catalysis.<p><a href='/help/act_site' target='_top'>More...</a></p>Active sitei526Charge relay systemBy similarity1
Active sitei576Charge relay systemBy similarity1
Active sitei699Charge relay systemBy similarity1

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

Complete GO annotation on QuickGO ...

GO - Biological processi

Complete GO annotation on QuickGO ...

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionHydrolase, Protease, Serine protease
Biological processComplement alternate pathway, Immunity, Innate immunity

Protein family/group databases

MEROPS protease database

More...MEROPSi		S01.196

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Complement factor B (EC:3.4.21.47)
Alternative name(s):
C3/C5 convertase
Cleaved into the following 2 chains:
Complement factor B Ba fragment
Complement factor B Bb fragment
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:CFB
Synonyms:BF
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiPongo pygmaeus (Bornean orangutan)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri9600 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiEukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Pongo

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Keywords - Cellular componenti

Secreted

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section denotes the presence of an N-terminal signal peptide.<p><a href='/help/signal' target='_top'>More...</a></p>Signal peptidei1 – 25By similarityAdd BLAST25
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_000002755426 – 764Complement factor BAdd BLAST739
ChainiPRO_000002755526 – 259Complement factor B Ba fragmentAdd BLAST234
ChainiPRO_0000027556260 – 764Complement factor B Bb fragmentAdd BLAST505

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the PTM / Processing":/help/ptm_processing_section section describes the positions of cysteine residues participating in disulfide bonds.<p><a href='/help/disulfid' target='_top'>More...</a></p>Disulfide bondi37 ↔ 76By similarity
Disulfide bondi62 ↔ 98By similarity
Disulfide bondi103 ↔ 145By similarity
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM / Processing</a> section specifies the position and type of each covalently attached glycan group (mono-, di-, or polysaccharide).<p><a href='/help/carbohyd' target='_top'>More...</a></p>Glycosylationi122N-linked (GlcNAc...) asparagineSequence analysis1
Disulfide bondi131 ↔ 158By similarity
Glycosylationi142N-linked (GlcNAc...) asparagineSequence analysis1
Disulfide bondi165 ↔ 205By similarity
Disulfide bondi191 ↔ 218By similarity
Glycosylationi285N-linked (GlcNAc...) asparagineSequence analysis1
Glycosylationi378N-linked (GlcNAc...) asparagineSequence analysis1
Disulfide bondi511 ↔ 527By similarity
Disulfide bondi695 ↔ 725By similarity

Keywords - PTMi

Cleavage on pair of basic residues, Disulfide bond, Glycoprotein, Zymogen

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Monomer (By similarity). Part of the C3-convertase enzyme complex comprised of Complement C3 beta chain (C3b) and Complement factor B Bb fragment (Bb) and CFP (By similarity). Interacts to C3b; this interaction is dependent on the presence of Mg2+ (By similarity). Interacts to CFP; this interaction contributes to the stabilization of the active C3-convertase enzyme complex (By similarity).

By similarity

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

AlphaFold Protein Structure Database

More...AlphaFoldDBi		Q864W1

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...SMRi		Q864W1

Database of comparative protein structure models

More...ModBasei		Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family%5Fand%5Fdomains%5Fsection">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini35 – 100Sushi 1PROSITE-ProRule annotationAdd BLAST66
Domaini101 – 160Sushi 2PROSITE-ProRule annotationAdd BLAST60
Domaini163 – 220Sushi 3PROSITE-ProRule annotationAdd BLAST58
Domaini270 – 469VWFAPROSITE-ProRule annotationAdd BLAST200
Domaini477 – 757Peptidase S1PROSITE-ProRule annotationAdd BLAST281

<p>This subsection of the 'Family and domains' section provides general information on the biological role of a domain. The term 'domain' is intended here in its wide acceptation, it may be a structural domain, a transmembrane region or a functional domain. Several domains are described in this subsection.<p><a href='/help/domain_cc' target='_top'>More...</a></p>Domaini

The unliganded VWA domain has an inactive 'locked' conformation whereby the scissile Arg-259|Lys-260 bond is protected from proteolytic activation.By similarity

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the peptidase S1 family.PROSITE-ProRule annotation

Keywords - Domaini

Repeat, Signal, Sushi

Family and domain databases

Conserved Domains Database

More...CDDi		cd00033, CCP, 3 hits
cd00190, Tryp_SPc, 1 hit

Gene3D Structural and Functional Annotation of Protein Families

More...Gene3Di		3.40.50.410, 1 hit

Integrated resource of protein families, domains and functional sites

More...InterProi		View protein in InterPro
IPR011360, Compl_C2_B
IPR028341, Complement_B
IPR009003, Peptidase_S1_PA
IPR001314, Peptidase_S1A
IPR035976, Sushi/SCR/CCP_sf
IPR000436, Sushi_SCR_CCP_dom
IPR001254, Trypsin_dom
IPR018114, TRYPSIN_HIS
IPR033116, TRYPSIN_SER
IPR002035, VWF_A
IPR036465, vWFA_dom_sf

The PANTHER Classification System

More...PANTHERi		PTHR46393, PTHR46393, 1 hit
PTHR46393:SF1, PTHR46393:SF1, 1 hit

Pfam protein domain database

More...Pfami		View protein in Pfam
PF00084, Sushi, 3 hits
PF00089, Trypsin, 1 hit
PF00092, VWA, 1 hit

PIRSF; a whole-protein classification database

More...PIRSFi		PIRSF001154, Compl_C2_B, 1 hit

Protein Motif fingerprint database; a protein domain database

More...PRINTSi		PR00722, CHYMOTRYPSIN

Simple Modular Architecture Research Tool; a protein domain database

More...SMARTi		View protein in SMART
SM00032, CCP, 3 hits
SM00020, Tryp_SPc, 1 hit
SM00327, VWA, 1 hit

Superfamily database of structural and functional annotation

More...SUPFAMi		SSF50494, SSF50494, 1 hit
SSF53300, SSF53300, 1 hit
SSF57535, SSF57535, 3 hits

PROSITE; a protein domain and family database

More...PROSITEi		View protein in PROSITE
PS50923, SUSHI, 3 hits
PS50240, TRYPSIN_DOM, 1 hit
PS00134, TRYPSIN_HIS, 1 hit
PS00135, TRYPSIN_SER, 1 hit
PS50234, VWFA, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequencei

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.

Q864W1-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MGSNLSPQLC LMPFILGLLS GGVTTTPLSL ARSQGSCSLE GIEIKGGSFR 
        60         70         80         90        100
LLQDGQALEY VCPSGFYPYP VQTRTCRSTG SWSTLQTQDQ KTVKKAECRA 
       110        120        130        140        150
IHCPRPHDFE NGEYWPRSPY YNVSDEISFH CYDGYTLRGS ANRTCQVNGR 
       160        170        180        190        200
WSGQTAICDN GAGYCSNPGI PIGTRKVGSQ YRLEDSVTYH CSRGLTLRGS 
       210        220        230        240        250
QRRTCQEGGS WSGTEPSCQD SFMYDTPQEV AEAFLSSLTE TIEGVDAEDG 
       260        270        280        290        300
HGPGEQQKRK IVLDPSGSMN IYLVLDGSDS IGAGNFTGAK KCLVNLIEKV 
       310        320        330        340        350
ASYGVKPRYG LVTYATYPKI WVKVSEPDSS NADWVTKQLN EINYEDHKLK 
       360        370        380        390        400
SGTNTKKALQ AVYSMMSWPD DIPPEGWNRT RHVIILMTDG LHNMGGDPIT 
       410        420        430        440        450
VIDEIRDLLY IGKDRKNPRE DYLDVYVFGV GPLVNQVNIN ALASKKDNEQ 
       460        470        480        490        500
HVFKVKDMEN LEDVFFQMID ESQSLSLCGM VWEHRKGTDY HKQPWQAKIS 
       510        520        530        540        550
VTRPSKGHES CMGAVVSEYF VLTAAHCFTV DDKEHSIKVS VGGKKQDLEI 
       560        570        580        590        600
EEVLFHPNYN INGKKEAGIP EFYDYDVALI KLKNKLNYRQ TIRPICLPCT 
       610        620        630        640        650
EGTTRALRLP PTTTCQQQKE ELLPAQDIKA LFVSEEEKKL TRKEVYIKNG 
       660        670        680        690        700
DKKGSCERDA QYAPGYDKVK DISEVVTPRF LCTGGVSPYA DPNTCRGDSG 
       710        720        730        740        750
GPLIVHKRSR FIQVGVISWG VVDVCKNQKR QKQVPAHARD FHINLFQVLP 
       760 
WLKQKLQDED LGFL
Length:764
Mass (Da):85,489
Last modified:June 1, 2003 - v1
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i2FFA047D6C34E6EB
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...EMBLi

GenBank nucleotide sequence database

More...GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...DDBJi
Links Updated
AY074662 Genomic DNA Translation: AAM10003.1

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY074662 Genomic DNA Translation: AAM10003.1

3D structure databases

AlphaFoldDBiQ864W1
SMRiQ864W1
ModBaseiSearch...

Protein family/group databases

MEROPSiS01.196

Family and domain databases

CDDicd00033, CCP, 3 hits
cd00190, Tryp_SPc, 1 hit
Gene3Di3.40.50.410, 1 hit
InterProiView protein in InterPro
IPR011360, Compl_C2_B
IPR028341, Complement_B
IPR009003, Peptidase_S1_PA
IPR001314, Peptidase_S1A
IPR035976, Sushi/SCR/CCP_sf
IPR000436, Sushi_SCR_CCP_dom
IPR001254, Trypsin_dom
IPR018114, TRYPSIN_HIS
IPR033116, TRYPSIN_SER
IPR002035, VWF_A
IPR036465, vWFA_dom_sf
PANTHERiPTHR46393, PTHR46393, 1 hit
PTHR46393:SF1, PTHR46393:SF1, 1 hit
PfamiView protein in Pfam
PF00084, Sushi, 3 hits
PF00089, Trypsin, 1 hit
PF00092, VWA, 1 hit
PIRSFiPIRSF001154, Compl_C2_B, 1 hit
PRINTSiPR00722, CHYMOTRYPSIN
SMARTiView protein in SMART
SM00032, CCP, 3 hits
SM00020, Tryp_SPc, 1 hit
SM00327, VWA, 1 hit
SUPFAMiSSF50494, SSF50494, 1 hit
SSF53300, SSF53300, 1 hit
SSF57535, SSF57535, 3 hits
PROSITEiView protein in PROSITE
PS50923, SUSHI, 3 hits
PS50240, TRYPSIN_DOM, 1 hit
PS00134, TRYPSIN_HIS, 1 hit
PS00135, TRYPSIN_SER, 1 hit
PS50234, VWFA, 1 hit

MobiDB: a database of protein disorder and mobility annotations

More...MobiDBi		Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiCFAB_PONPY
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: Q864W1
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: June 7, 2004
Last sequence update: June 1, 2003
Last modified: May 25, 2022
This is version 97 of the entry and version 1 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Documents

  1. Peptidase families
    Classification of peptidase families and list of entries
  2. SIMILARITY comments
    Index of protein domains and families
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