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Entry version 56 (02 Jun 2021)
Sequence version 1 (21 Mar 2006)
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Protein

Complement control protein

Gene

ORF4

Organism
Human herpesvirus 8 type P (isolate GK18) (HHV-8) (Kaposi's sarcoma-associated herpesvirus)
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

Inhibits the complement component of the host innate immune response. Regulates host C3 convertases, accelerating their decay, and acts as a cofactor for factor I degradation of C4b and C3b. Binds also heparin, and therefore may play two distinct roles when incorporated in virion membranes: immune evasion and host cell binding.

3 Publications

<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 - Biological processi

<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

Biological processHost-virus interaction, Inhibition of host complement factors by virus, Viral immunoevasion

<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 control protein
Short name:
KCP
<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:ORF4
<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>OrganismiHuman herpesvirus 8 type P (isolate GK18) (HHV-8) (Kaposi's sarcoma-associated herpesvirus)
<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 identifieri868565 [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 lineageiVirusesDuplodnaviriaHeunggongviraePeploviricotaHerviviricetesHerpesviralesHerpesviridaeGammaherpesvirinaeRhadinovirus
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section only exists in viral entries and indicates the host(s) either as a specific organism or taxonomic group of organisms that are susceptible to be infected by a virus.<p><a href='/help/virus_host' target='_top'>More...</a></p>Virus hostiHomo sapiens (Human) [TaxID: 9606]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000000942 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Genome

<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

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the extent of a membrane-spanning region of the protein. It denotes the presence of both alpha-helical transmembrane regions and the membrane spanning regions of beta-barrel transmembrane proteins.<p><a href='/help/transmem' target='_top'>More...</a></p>Transmembranei528 – 548HelicalSequence analysisAdd BLAST21

Keywords - Cellular componenti

Host membrane, Membrane, Virion

<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 – 19Sequence analysisAdd BLAST19
<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_000042383720 – 550Complement control proteinAdd BLAST531

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 bondi25 ↔ 68PROSITE-ProRule annotation
Disulfide bondi53 ↔ 81PROSITE-ProRule annotation
<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>Glycosylationi63N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Disulfide bondi86 ↔ 131PROSITE-ProRule annotation
Glycosylationi111N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Disulfide bondi116 ↔ 148PROSITE-ProRule annotation
Disulfide bondi153 ↔ 194PROSITE-ProRule annotation
Disulfide bondi180 ↔ 207PROSITE-ProRule annotation
Glycosylationi197N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Disulfide bondi212 ↔ 254PROSITE-ProRule annotation
Disulfide bondi240 ↔ 266PROSITE-ProRule annotation
Glycosylationi255N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi275N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi299N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi334N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi371N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi374N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi378N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi426N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi445N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi455N-linked (GlcNAc...) asparagine; by hostSequence analysis1
Glycosylationi483N-linked (GlcNAc...) asparagine; by hostSequence analysis1

Keywords - PTMi

Disulfide bond, Glycoprotein

Proteomic databases

PRoteomics IDEntifications database

More...
PRIDEi
Q2HRD4

<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

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGRID)

More...
BioGRIDi
1776991, 25 interactors

<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

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

More...
SMRi
Q2HRD4

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>Domaini23 – 83Sushi 1PROSITE-ProRule annotationAdd BLAST61
Domaini84 – 150Sushi 2PROSITE-ProRule annotationAdd BLAST67
Domaini151 – 209Sushi 3PROSITE-ProRule annotationAdd BLAST59
Domaini210 – 268Sushi 4PROSITE-ProRule annotationAdd BLAST59

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni269 – 338DisorderedSequence analysisAdd BLAST70
Regioni387 – 408DisorderedSequence analysisAdd BLAST22
Regioni420 – 516DisorderedSequence analysisAdd BLAST97

Compositional bias

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes the position of regions of compositional bias within the protein and the particular type of amino acids that are over-represented within those regions.<p><a href='/help/compbias' target='_top'>More...</a></p>Compositional biasi278 – 338Polar residuesSequence analysisAdd BLAST61
Compositional biasi420 – 495Polar residuesSequence analysisAdd BLAST76

Keywords - Domaini

Repeat, Signal, Sushi, Transmembrane, Transmembrane helix

Family and domain databases

Conserved Domains Database

More...
CDDi
cd00033, CCP, 4 hits

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR035976, Sushi/SCR/CCP_sf
IPR000436, Sushi_SCR_CCP_dom

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00084, Sushi, 4 hits

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00032, CCP, 4 hits

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF57535, SSF57535, 4 hits

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS50923, SUSHI, 4 hits

<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.

Q2HRD4-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MAFLRQTLWI LWTFTMVIGQ DNEKCSQKTL IGYRLKMSRD GDIAVGETVE
60 70 80 90 100
LRCRSGYTTY ARNITATCLQ GGTWSEPTAT CNKKSCPNPG EIQNGKVIFH
110 120 130 140 150
GGQDALKYGA NISYVCNEGY FLVGREYVRY CMIGASGQMA WSSSPPFCEK
160 170 180 190 200
EKCHRPKIEN GDFKPDKDYY EYNDAVHFEC NEGYTLVGPH SIACAVNNTW
210 220 230 240 250
TSNMPTCELA GCKFPSVTHG YPIQGFSLTY KHKQSVTFAC NDGFVLRGSP
260 270 280 290 300
TITCNVTEWD PPLPKCVLED IDDPNNSNPG RLHPTPNEKP NGNVFQRSNY
310 320 330 340 350
TEPPTKPEDT HTAATCDTNC EQPPKILPTS EGFNETTTSN TITKQLEDEK
360 370 380 390 400
TTSQPNTHIT SALTSMKAKG NFTNKTNNST DLHIASTPTS QDDATPSIPS
410 420 430 440 450
VQTPNYNTNA PTRTLTSLHI EEGPSNSTTS EKATASTLSH NSHKNDTGGI
460 470 480 490 500
YTTLNKTTQL PSTNKPTNSQ AKSSTKPRVE THNKTTSNPA ISLTDSADVP
510 520 530 540 550
QRPREPTLPP IFRPPASKNR YLEKQLVIGL LTAVALTCGL ITLFHYLFFR
Length:550
Mass (Da):60,661
Last modified:March 21, 2006 - 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:i068FC1C30ADDDE32
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
AF148805 Genomic DNA Translation: ABD28848.1

NCBI Reference Sequences

More...
RefSeqi
YP_001129351.1, NC_009333.1

Genome annotation databases

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
4961488

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
vg:4961488

<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
AF148805 Genomic DNA Translation: ABD28848.1
RefSeqiYP_001129351.1, NC_009333.1

3D structure databases

SMRiQ2HRD4
ModBaseiSearch...

Protein-protein interaction databases

BioGRIDi1776991, 25 interactors

Proteomic databases

PRIDEiQ2HRD4

Protocols and materials databases

The DNASU plasmid repository

More...
DNASUi
4961488

Genome annotation databases

GeneIDi4961488
KEGGivg:4961488

Family and domain databases

CDDicd00033, CCP, 4 hits
InterProiView protein in InterPro
IPR035976, Sushi/SCR/CCP_sf
IPR000436, Sushi_SCR_CCP_dom
PfamiView protein in Pfam
PF00084, Sushi, 4 hits
SMARTiView protein in SMART
SM00032, CCP, 4 hits
SUPFAMiSSF57535, SSF57535, 4 hits
PROSITEiView protein in PROSITE
PS50923, SUSHI, 4 hits

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 nameiORF4_HHV8P
<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: Q2HRD4
Secondary accession number(s): D0UZL0
<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: October 16, 2013
Last sequence update: March 21, 2006
Last modified: June 2, 2021
This is version 56 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 programViral 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

Keywords - Technical termi

Reference proteome
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