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Protein

Importin subunit beta-1

Gene

Kpnb1

Organism
Rattus norvegicus (Rat)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

Functions in nuclear protein import, either in association with an adapter protein, like an importin-alpha subunit, which binds to nuclear localization signals (NLS) in cargo substrates, or by acting as autonomous nuclear transport receptor. Acting autonomously, serves itself as NLS receptor. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Mediates autonomously the nuclear import of ribosomal proteins RPL23A, RPS7 and RPL5. Binds to a beta-like import receptor binding (BIB) domain of RPL23A. In association with IPO7 mediates the nuclear import of H1 histone. In vitro, mediates nuclear import of H2A, H2B, H3 and H4 histones. Imports SNAI1 and PRKCI into the nucleus (By similarity).By similarity

GO - Molecular functioni

GO - Biological processi

Keywordsi

Biological processProtein transport, Transport

Names & Taxonomyi

Protein namesi
Recommended name:
Importin subunit beta-1
Alternative name(s):
Karyopherin subunit beta-1
Nuclear factor p97
Pore targeting complex 97 kDa subunit
Short name:
PTAC97
Gene namesi
Name:Kpnb1
OrganismiRattus norvegicus (Rat)
Taxonomic identifieri10116 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresGliresRodentiaMyomorphaMuroideaMuridaeMurinaeRattus
Proteomesi
  • UP000002494 Componenti: Unplaced

Organism-specific databases

RGDi2909. Kpnb1.

Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte; Source: COMPARTMENTS

Keywords - Cellular componenti

Cytoplasm, Nucleus

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001207471 – 875Importin subunit beta-1Add BLAST875

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei1N-acetylmethionineBy similarity1
Modified residuei12PhosphoserineBy similarity1
Modified residuei210N6-acetyllysineBy similarity1
Modified residuei834N6-acetyllysineBy similarity1
Modified residuei866N6-acetyllysineBy similarity1

Post-translational modificationi

Mono-ADP-ribosylated by PARP16.By similarity

Keywords - PTMi

Acetylation, ADP-ribosylation, Phosphoprotein

Proteomic databases

PaxDbiP52296.
PeptideAtlasiP52296.
PRIDEiP52296.

PTM databases

iPTMnetiP52296.
PhosphoSitePlusiP52296.

Interactioni

Subunit structurei

Forms a complex with an importin alpha subunit. Forms a heterodimer with IPO7. Interacts with IPO7, SNUPN, RPL23A and XPO1. The KPNB1/IPO7 heterodimer interacts with H1 histone. Interacts with H2A, H2B, H3 and H4 histones (By similarity). Component of an import snRNP complex composed of KPNB1, SNUPN, SMN1 and ZNF259. Component of a nuclear export receptor complex composed of KPNB1, Ran, SNUPN and XPO1. Interacts with SRY. Interacts with PRKCI/atypical protein kinase C iota (By similarity). Interacts with KPNA7. Interacts with SNAI1 (via zinc fingers) and SNAI2 (via zinc fingers) (By similarity). Interacts with SLC35G1 and STIM1 (By similarity). Interacts with DCAF8 (By similarity). Interacts with RAN (By similarity). Interacts with NUMA1 (via C-terminus); this interaction is inhibited by RanGTP (By similarity).By similarity

GO - Molecular functioni

  • enzyme binding Source: RGD
  • Hsp90 protein binding Source: RGD
  • kinesin binding Source: RGD
  • protein complex binding Source: RGD
  • protein domain specific binding Source: RGD
  • Ran GTPase binding Source: InterPro

Protein-protein interaction databases

BioGridi247024. 2 interactors.
CORUMiP52296.
DIPiDIP-37024N.
IntActiP52296. 4 interactors.
MINTiMINT-4592883.
STRINGi10116.ENSRNOP00000012376.

Structurei

3D structure databases

ProteinModelPortaliP52296.
SMRiP52296.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Repeati2 – 31HEAT 1By similarityAdd BLAST30
Domaini21 – 100Importin N-terminalPROSITE-ProRule annotationAdd BLAST80
Repeati33 – 64HEAT 2By similarityAdd BLAST32
Repeati84 – 122HEAT 3By similarityAdd BLAST39
Repeati128 – 159HEAT 4By similarityAdd BLAST32
Repeati169 – 201HEAT 5By similarityAdd BLAST33
Repeati211 – 246HEAT 6By similarityAdd BLAST36
Repeati252 – 301HEAT 7By similarityAdd BLAST50
Repeati313 – 359HEAT 8By similarityAdd BLAST47
Repeati363 – 393HEAT 9By similarityAdd BLAST31
Repeati401 – 437HEAT 10By similarityAdd BLAST37
Repeati448 – 484HEAT 11By similarityAdd BLAST37
Repeati499 – 536HEAT 12By similarityAdd BLAST38
Repeati543 – 591HEAT 13By similarityAdd BLAST49
Repeati599 – 638HEAT 14By similarityAdd BLAST40
Repeati643 – 680HEAT 15By similarityAdd BLAST38
Repeati685 – 723HEAT 16By similarityAdd BLAST39
Repeati731 – 775HEAT 17By similarityAdd BLAST45
Repeati785 – 828HEAT 18By similarityAdd BLAST44
Repeati830 – 872HEAT 19By similarityAdd BLAST43

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni328 – 341IAB-bindingAdd BLAST14
Regioni333 – 418Ran-GTP bindingBy similarityAdd BLAST86

Sequence similaritiesi

Keywords - Domaini

Repeat

Phylogenomic databases

eggNOGiKOG1241. Eukaryota.
COG5215. LUCA.
HOGENOMiHOG000204108.
HOVERGENiHBG002369.
InParanoidiP52296.
KOiK14293.
PhylomeDBiP52296.

Family and domain databases

Gene3Di1.25.10.10. 1 hit.
InterProiView protein in InterPro
IPR011989. ARM-like.
IPR016024. ARM-type_fold.
IPR000225. Armadillo.
IPR021133. HEAT_type_2.
IPR001494. Importin-beta_N.
PfamiView protein in Pfam
PF03810. IBN_N. 1 hit.
SMARTiView protein in SMART
SM00185. ARM. 3 hits.
SM00913. IBN_N. 1 hit.
SUPFAMiSSF48371. SSF48371. 1 hit.
PROSITEiView protein in PROSITE
PS50077. HEAT_REPEAT. 1 hit.
PS50166. IMPORTIN_B_NT. 1 hit.

Sequencei

Sequence statusi: Complete.

P52296-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MELITILEKT VSPDRLELEA AQKFLERAAV ENLPTFLVEL SRVLANPGNS
60 70 80 90 100
QVARVAAGLQ IRLLTSKDPD IKAQYQQRWL AIDANARREV KNYVLQTLGT
110 120 130 140 150
ETYRPSSASQ CVAGIACAEI PVSQWPELIP QLVANVTNPN STEHMKESTL
160 170 180 190 200
EAIGYICQDI DPEQLQDKSN EILTAIIQGM RKEEPSNNVK LAATNALLNS
210 220 230 240 250
LEFTKANFDK ESERHFIMQV VCEATQCPDT RVRVAALQNL VKIMSLYYQY
260 270 280 290 300
METYMGPALF AITIEAMKSD IDEVALQGIE FWSNVCDEEM DLAIEASEAA
310 320 330 340 350
EQGRPPEHTS KFYAKGALQY LVPILTQTLT KQDENDDDDD WNPCKAAGVC
360 370 380 390 400
LMLLSTCCED DIVPHVLPFI KEHIKNPDWR YRDAAVMAFG SILEGPEPNQ
410 420 430 440 450
LKPLVIQAMP TLIELMKDPS VVVRDTTAWT VGRICELLPE AAINDVYLAP
460 470 480 490 500
LLQCLIEGLS AEPRVASNVC WAFSSLAEAA YEAADVADDQ EEPATYCLSS
510 520 530 540 550
SFELIVQKLL ETTDRPDGHQ NNLRSSAYES LMEIVKNSAK DCYPAVQKTT
560 570 580 590 600
LVIMERLQQV LQMESHIQST SDRIQFNDLQ SLLCATLQNV LWKVQHQDAL
610 620 630 640 650
QISDVVMASL LRMFQSTAGS GGVQEDALMA VSTLVEVLGG EFLKYMEAFK
660 670 680 690 700
PFLGIGLKNY AECQVCLAAV GLVGDLCRAL QSNILPFCDE VMQLLLENLG
710 720 730 740 750
NENVHRSVKP QILSVFGDIT LAIGGEFKKY LEVVLNTLQQ ASQAQVDKSD
760 770 780 790 800
FDMVDYLNEL RESCLEAYTG IVQGLKGDQE NVHPDVMLVQ PRVEFILSFI
810 820 830 840 850
DHIAGDEDHT DGVVACAAGL IGDLCTAFGK DVLKLVEARP MIHELLTEGR
860 870
RSKTNKAKTL ATWATKELRK LKNQA
Length:875
Mass (Da):97,124
Last modified:October 1, 1996 - v1
Checksum:i9CD77A05744014C4
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
L38644 mRNA. Translation: AAC42047.1.
PIRiI59350.
RefSeqiNP_058759.1. NM_017063.1.
UniGeneiRn.11061.

Genome annotation databases

GeneIDi24917.
KEGGirno:24917.
UCSCiRGD:2909. rat.

Similar proteinsi

Entry informationi

Entry nameiIMB1_RAT
AccessioniPrimary (citable) accession number: P52296
Entry historyiIntegrated into UniProtKB/Swiss-Prot: October 1, 1996
Last sequence update: October 1, 1996
Last modified: November 22, 2017
This is version 140 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Direct protein sequencing, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families