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Protein

IQ calmodulin-binding motif-containing protein 1

Gene

IQCB1

Organism
Homo sapiens (Human)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

Involved in ciliogenesis. The function in an early step in cilia formation depends on its association with CEP290/NPHP6 (PubMed:23446637). Involved in regulation of the BBSome complex integrity, specifically for presence of BBS2 and BBS5 in the complex, and in ciliary targeting of selected BBSome cargos. May play a role in controlling entry of the BBSome complex to cilia possibly implicating CEP290/NPHP6 (PubMed:25552655).2 Publications

GO - Molecular functioni

  • calmodulin binding Source: HGNC
  • enzyme binding Source: UniProtKB

GO - Biological processi

  • cilium assembly Source: UniProtKB
  • maintenance of organ identity Source: HGNC
  • photoreceptor cell maintenance Source: HGNC
Complete GO annotation...

Keywords - Biological processi

Cilium biogenesis/degradation

Keywords - Ligandi

Calmodulin-binding

Enzyme and pathway databases

ReactomeiR-HSA-5620912. Anchoring of the basal body to the plasma membrane.

Names & Taxonomyi

Protein namesi
Recommended name:
IQ calmodulin-binding motif-containing protein 1
Alternative name(s):
Nephrocystin-5
p53 and DNA damage-regulated IQ motif protein
Short name:
PIQ
Gene namesi
Name:IQCB1
Synonyms:KIAA0036, NPHP5
ORF Names:OK/SW-cl.85
OrganismiHomo sapiens (Human)
Taxonomic identifieri9606 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
Proteomesi
  • UP000005640 Componenti: Chromosome 3

Organism-specific databases

HGNCiHGNC:28949. IQCB1.

Subcellular locationi

GO - Cellular componenti

  • centrosome Source: UniProtKB
  • cytosol Source: Reactome
  • extracellular exosome Source: UniProtKB
  • intercellular bridge Source: HPA
  • microtubule cytoskeleton Source: HPA
  • nucleoplasm Source: HPA
  • photoreceptor connecting cilium Source: HGNC
  • photoreceptor outer segment Source: Ensembl
Complete GO annotation...

Keywords - Cellular componenti

Cytoplasm, Cytoskeleton

Pathology & Biotechi

Involvement in diseasei

Senior-Loken syndrome 5 (SLSN5)1 Publication
The disease is caused by mutations affecting the gene represented in this entry.
Disease descriptionA renal-retinal disorder characterized by progressive wasting of the filtering unit of the kidney (nephronophthisis), with or without medullary cystic renal disease, and progressive eye disease. Typically this disorder becomes apparent during the first year of life.
See also OMIM:609254
Leber congenital amaurosis 10 (LCA10)1 Publication
The gene represented in this entry may be involved in disease pathogenesis.
Disease descriptionA severe dystrophy of the retina, typically becoming evident in the first years of life. Visual function is usually poor and often accompanied by nystagmus, sluggish or near-absent pupillary responses, photophobia, high hyperopia and keratoconus.
See also OMIM:611755

Mutagenesis

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Mutagenesisi549 – 5491A → K: Disrupts interaction with CEP290, no effect on interaction with BBS1, BBS2, BBS4, BBS8 and BBS9, abolishes ciliogenesis. 2 Publications

Keywords - Diseasei

Ciliopathy, Leber congenital amaurosis, Nephronophthisis, Senior-Loken syndrome

Organism-specific databases

MalaCardsiIQCB1.
MIMi609254. phenotype.
611755. phenotype.
Orphaneti65. Leber congenital amaurosis.
3156. Senior-Loken syndrome.
PharmGKBiPA134869761.

Polymorphism and mutation databases

BioMutaiIQCB1.
DMDMi3123054.

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 598598IQ calmodulin-binding motif-containing protein 1PRO_0000084225Add
BLAST

Amino acid modifications

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Modified residuei572 – 5721PhosphoserineCombined sources

Keywords - PTMi

Phosphoprotein

Proteomic databases

EPDiQ15051.
PaxDbiQ15051.
PeptideAtlasiQ15051.
PRIDEiQ15051.

PTM databases

iPTMnetiQ15051.
PhosphoSiteiQ15051.

Expressioni

Tissue specificityi

Ubiquitously expressed in fetal and adult tissues. Localized to the outer segments and connecting cilia of photoreceptor cells. Up-regulated in a number of primary colorectal and gastric tumors.2 Publications

Inductioni

Down-regulated by DNA damage in a p53-dependent manner.1 Publication

Gene expression databases

BgeeiENSG00000173226.
CleanExiHS_IQCB1.
ExpressionAtlasiQ15051. baseline and differential.
GenevisibleiQ15051. HS.

Organism-specific databases

HPAiHPA042028.

Interactioni

Subunit structurei

Interacts with calmodulin, CEP290, ATXN10 (PubMed:16322217, PubMed:15723066, PubMed:18723859, PubMed:21565611, PubMed:23446637, PubMed:25552655). Interacts with NPHP1, INVS, NPHP4 and RPGRIP1L; these interactions likely require additional interactors (PubMed:21565611). Associates with the BBSome complex; interacts with BBS1, BBS2, BBS4, BBS5, BBS7, BBS8 and BBS9 (PubMed:25552655).5 Publications

Binary interactionsi

WithEntry#Exp.IntActNotes
BBS1Q8NFJ94EBI-2805823,EBI-1805484
BBS2Q9BXC98EBI-2805823,EBI-748297
BBS4Q96RK45EBI-2805823,EBI-1805814
BBS5Q8N3I78EBI-2805823,EBI-2892592
BBS7Q8IWZ65EBI-2805823,EBI-1806001
BBS9Q3SYG45EBI-2805823,EBI-2826852
CALM3P621587EBI-2805823,EBI-397435
CEP290O1507823EBI-2805823,EBI-1811944
TTC8Q8TAM25EBI-2805823,EBI-2892638

GO - Molecular functioni

  • calmodulin binding Source: HGNC
  • enzyme binding Source: UniProtKB

Protein-protein interaction databases

BioGridi115015. 217 interactions.
IntActiQ15051. 191 interactions.
MINTiMINT-8201089.
STRINGi9606.ENSP00000311505.

Structurei

3D structure databases

ProteinModelPortaliQ15051.
SMRiQ15051. Positions 291-333, 385-413.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Domaini294 – 31724IQ 1PROSITE-ProRule annotationAdd
BLAST
Domaini318 – 33821IQ 2PROSITE-ProRule annotationAdd
BLAST
Domaini387 – 41630IQ 3PROSITE-ProRule annotationAdd
BLAST
Domaini417 – 43721IQ 4PROSITE-ProRule annotationAdd
BLAST

Region

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Regioni1 – 157157Interaction with BBS1, BBS8 and BBS91 PublicationAdd
BLAST
Regioni287 – 598312Interaction with CEP290, BBS1, BBS2, BBS4, BBS5, BBS7, BBS8 and BBS91 PublicationAdd
BLAST
Regioni530 – 59869Interaction with BBS1, BBS2, BBS4, BBS7, BBS8 and BBS91 PublicationAdd
BLAST

Coiled coil

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Coiled coili336 – 37338Sequence analysisAdd
BLAST

Domaini

The IQ domains mediate the interaction with calmodulin.1 Publication

Sequence similaritiesi

Contains 4 IQ domains.PROSITE-ProRule annotation

Keywords - Domaini

Coiled coil, Repeat

Phylogenomic databases

eggNOGiKOG0160. Eukaryota.
COG5022. LUCA.
GeneTreeiENSGT00390000002188.
HOGENOMiHOG000113095.
HOVERGENiHBG052142.
InParanoidiQ15051.
KOiK16774.
OMAiRQLQTCF.
OrthoDBiEOG091G06IO.
PhylomeDBiQ15051.
TreeFamiTF351884.

Family and domain databases

InterProiIPR016024. ARM-type_fold.
IPR000048. IQ_motif_EF-hand-BS.
IPR028765. IQCB1.
IPR027417. P-loop_NTPase.
[Graphical view]
PANTHERiPTHR15673. PTHR15673. 1 hit.
PfamiPF00612. IQ. 2 hits.
[Graphical view]
SMARTiSM00015. IQ. 2 hits.
[Graphical view]
SUPFAMiSSF48371. SSF48371. 2 hits.
SSF52540. SSF52540. 1 hit.
PROSITEiPS50096. IQ. 2 hits.
[Graphical view]

Sequences (3)i

Sequence statusi: Complete.

This entry describes 3 isoformsi produced by alternative splicing. AlignAdd to basket

Isoform 1 (identifier: Q15051-1) [UniParc]FASTAAdd to basket
Also known as: PIQ-L

This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

« Hide

        10         20         30         40         50
MKPTGTDPRI LSIAAEVAKS PEQNVPVILL KLKEIINITP LGSSELKKIK
60 70 80 90 100
QDIYCYDLIQ YCLLVLSQDY SRIQGGWTTI SQLTQILSHC CVGLEPGEDA
110 120 130 140 150
EEFYNELLPS AAENFLVLGR QLQTCFINAA KAEEKDELLH FFQIVTDSLF
160 170 180 190 200
WLLGGHVELI QNVLQSDHFL HLLQADNVQI GSAVMMMLQN ILQINSGDLL
210 220 230 240 250
RIGRKALYSI LDEVIFKLFS TPSPVIRSTA TKLLLLMAES HQEILILLRQ
260 270 280 290 300
STCYKGLRRL LSKQETGTEF SQELRQLVGL LSPMVYQEVE EQKLHQAACL
310 320 330 340 350
IQAYWKGFQT RKRLKKLPSA VIALQRSFRS KRSKMLLEIN RQKEEEDLKL
360 370 380 390 400
QLQLQRQRAM RLSRELQLSM LEIVHPGQVE KHYREMEEKS ALIIQKHWRG
410 420 430 440 450
YRERKNFHQQ RQSLIEYKAA VTLQRAALKF LAKCRKKKKL FAPWRGLQEL
460 470 480 490 500
TDARRVELKK RVDDYVRRHL GSPMSDVVSR ELHAQAQERL QHYFMGRALE
510 520 530 540 550
ERAQQHREAL IAQISTNVEQ LMKAPSLKEA EGKEPELFLS RSRPVAAKAK
560 570 580 590
QAHLTTLKHI QAPWWKKLGE ESGDEIDVPK DELSIELENL FIGGTKPP
Length:598
Mass (Da):68,929
Last modified:November 1, 1996 - v1
Checksum:i5589FDE6B0D15D78
GO
Isoform 2 (identifier: Q15051-2) [UniParc]FASTAAdd to basket
Also known as: PIQ-S

The sequence of this isoform differs from the canonical sequence as follows:
     196-328: Missing.

Note: Low abundance isoform.Curated
Show »
Length:465
Mass (Da):53,698
Checksum:i1F2285CC36AB3C6D
GO
Isoform 3 (identifier: Q15051-3) [UniParc]FASTAAdd to basket

The sequence of this isoform differs from the canonical sequence as follows:
     293-303: KLHQAACLIQA → IQTIKDVAGDK
     304-598: Missing.

Note: No experimental confirmation available.
Show »
Length:303
Mass (Da):34,132
Checksum:i313F2A5203B4C268
GO

Sequence cautioni

The sequence BAA04968 differs from that shown. Reason: Erroneous initiation. Curated

Experimental Info

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Isoform 2 (identifier: Q15051-2)
Sequence conflicti352 – 3521Q → P in AAY46029 (PubMed:16322217).Curated

Natural variant

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Natural varianti142 – 1421F → L.
Corresponds to variant rs11926958 [ dbSNP | Ensembl ].
VAR_051074
Natural varianti393 – 3931I → N Impairs interaction with calmodulin. 1 Publication
Corresponds to variant rs1141528 [ dbSNP | Ensembl ].
VAR_051075
Natural varianti434 – 4341C → Y.1 Publication
Corresponds to variant rs17849995 [ dbSNP | Ensembl ].
VAR_061668
Natural varianti435 – 4351R → C.
Corresponds to variant rs11920543 [ dbSNP | Ensembl ].
VAR_051076

Alternative sequence

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Alternative sequencei196 – 328133Missing in isoform 2. 2 PublicationsVSP_010245Add
BLAST
Alternative sequencei293 – 30311KLHQAACLIQA → IQTIKDVAGDK in isoform 3. 1 PublicationVSP_013943Add
BLAST
Alternative sequencei304 – 598295Missing in isoform 3. 1 PublicationVSP_013944Add
BLAST

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY964667 mRNA. Translation: AAY46029.1.
AY964668 mRNA. Translation: AAY46030.1.
AY714228 mRNA. Translation: AAW47233.1.
D25278 mRNA. Translation: BAA04968.2. Different initiation.
AB062481 mRNA. Translation: BAB93506.1.
CH471052 Genomic DNA. Translation: EAW79500.1.
BC005806 mRNA. Translation: AAH05806.1.
CCDSiCCDS33836.1. [Q15051-2]
CCDS33837.1. [Q15051-1]
RefSeqiNP_001018864.2. NM_001023570.3. [Q15051-1]
NP_001018865.2. NM_001023571.3. [Q15051-2]
NP_001306036.1. NM_001319107.1. [Q15051-1]
UniGeneiHs.604110.

Genome annotation databases

EnsembliENST00000310864; ENSP00000311505; ENSG00000173226. [Q15051-1]
ENST00000349820; ENSP00000323756; ENSG00000173226. [Q15051-2]
ENST00000393650; ENSP00000377261; ENSG00000173226. [Q15051-3]
GeneIDi9657.
KEGGihsa:9657.
UCSCiuc003eek.3. human. [Q15051-1]

Keywords - Coding sequence diversityi

Alternative splicing, Polymorphism

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY964667 mRNA. Translation: AAY46029.1.
AY964668 mRNA. Translation: AAY46030.1.
AY714228 mRNA. Translation: AAW47233.1.
D25278 mRNA. Translation: BAA04968.2. Different initiation.
AB062481 mRNA. Translation: BAB93506.1.
CH471052 Genomic DNA. Translation: EAW79500.1.
BC005806 mRNA. Translation: AAH05806.1.
CCDSiCCDS33836.1. [Q15051-2]
CCDS33837.1. [Q15051-1]
RefSeqiNP_001018864.2. NM_001023570.3. [Q15051-1]
NP_001018865.2. NM_001023571.3. [Q15051-2]
NP_001306036.1. NM_001319107.1. [Q15051-1]
UniGeneiHs.604110.

3D structure databases

ProteinModelPortaliQ15051.
SMRiQ15051. Positions 291-333, 385-413.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi115015. 217 interactions.
IntActiQ15051. 191 interactions.
MINTiMINT-8201089.
STRINGi9606.ENSP00000311505.

PTM databases

iPTMnetiQ15051.
PhosphoSiteiQ15051.

Polymorphism and mutation databases

BioMutaiIQCB1.
DMDMi3123054.

Proteomic databases

EPDiQ15051.
PaxDbiQ15051.
PeptideAtlasiQ15051.
PRIDEiQ15051.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsembliENST00000310864; ENSP00000311505; ENSG00000173226. [Q15051-1]
ENST00000349820; ENSP00000323756; ENSG00000173226. [Q15051-2]
ENST00000393650; ENSP00000377261; ENSG00000173226. [Q15051-3]
GeneIDi9657.
KEGGihsa:9657.
UCSCiuc003eek.3. human. [Q15051-1]

Organism-specific databases

CTDi9657.
GeneCardsiIQCB1.
GeneReviewsiIQCB1.
HGNCiHGNC:28949. IQCB1.
HPAiHPA042028.
MalaCardsiIQCB1.
MIMi609237. gene.
609254. phenotype.
611755. phenotype.
neXtProtiNX_Q15051.
Orphaneti65. Leber congenital amaurosis.
3156. Senior-Loken syndrome.
PharmGKBiPA134869761.
HUGEiSearch...
GenAtlasiSearch...

Phylogenomic databases

eggNOGiKOG0160. Eukaryota.
COG5022. LUCA.
GeneTreeiENSGT00390000002188.
HOGENOMiHOG000113095.
HOVERGENiHBG052142.
InParanoidiQ15051.
KOiK16774.
OMAiRQLQTCF.
OrthoDBiEOG091G06IO.
PhylomeDBiQ15051.
TreeFamiTF351884.

Enzyme and pathway databases

ReactomeiR-HSA-5620912. Anchoring of the basal body to the plasma membrane.

Miscellaneous databases

ChiTaRSiIQCB1. human.
GeneWikiiIQCB1.
GenomeRNAii9657.
PROiQ15051.
SOURCEiSearch...

Gene expression databases

BgeeiENSG00000173226.
CleanExiHS_IQCB1.
ExpressionAtlasiQ15051. baseline and differential.
GenevisibleiQ15051. HS.

Family and domain databases

InterProiIPR016024. ARM-type_fold.
IPR000048. IQ_motif_EF-hand-BS.
IPR028765. IQCB1.
IPR027417. P-loop_NTPase.
[Graphical view]
PANTHERiPTHR15673. PTHR15673. 1 hit.
PfamiPF00612. IQ. 2 hits.
[Graphical view]
SMARTiSM00015. IQ. 2 hits.
[Graphical view]
SUPFAMiSSF48371. SSF48371. 2 hits.
SSF52540. SSF52540. 1 hit.
PROSITEiPS50096. IQ. 2 hits.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiIQCB1_HUMAN
AccessioniPrimary (citable) accession number: Q15051
Secondary accession number(s): Q3KS08
, Q3KS09, Q5DKQ7, Q8NI79, Q9BS08
Entry historyi
Integrated into UniProtKB/Swiss-Prot: July 15, 1998
Last sequence update: November 1, 1996
Last modified: September 7, 2016
This is version 143 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. Human chromosome 3
    Human chromosome 3: entries, gene names and cross-references to MIM
  2. Human entries with polymorphisms or disease mutations
    List of human entries with polymorphisms or disease mutations
  3. Human polymorphisms and disease mutations
    Index of human polymorphisms and disease mutations
  4. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  5. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.