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LBR_RAT
ID   LBR_RAT                 Reviewed;         620 AA.
AC   O08984;
DT   21-MAR-2006, integrated into UniProtKB/Swiss-Prot.
DT   01-JUL-1997, sequence version 1.
DT   03-AUG-2022, entry version 131.
DE   RecName: Full=Delta(14)-sterol reductase LBR;
DE            Short=Delta-14-SR;
DE            EC=1.3.1.70 {ECO:0000250|UniProtKB:Q14739};
DE   AltName: Full=3-beta-hydroxysterol Delta (14)-reductase {ECO:0000250|UniProtKB:Q14739};
DE   AltName: Full=C-14 sterol reductase;
DE            Short=C14SR;
DE   AltName: Full=Integral nuclear envelope inner membrane protein {ECO:0000250|UniProtKB:Q14739};
DE   AltName: Full=Lamin-B receptor {ECO:0000250|UniProtKB:Q14739};
DE   AltName: Full=NBP60 {ECO:0000303|PubMed:9192729};
DE   AltName: Full=Sterol C14-reductase;
GN   Name=Lbr;
OS   Rattus norvegicus (Rat).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Euarchontoglires; Glires; Rodentia; Myomorpha; Muroidea; Muridae;
OC   Murinae; Rattus.
OX   NCBI_TaxID=10116;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   STRAIN=Fischer 344; TISSUE=Liver;
RX   PubMed=9192729; DOI=10.1093/oxfordjournals.jbchem.a021669;
RA   Kawahire S., Takeuchi M., Gohshi T., Sasagawa S., Shimada M., Takahashi M.,
RA   Abe T.K., Ueda T., Kuwano R., Hikawa A., Ichimura T., Omata S.,
RA   Horigome T.;
RT   "cDNA cloning of nuclear localization signal binding protein NBP60, a rat
RT   homologue of lamin B receptor, and identification of binding sites of human
RT   lamin B receptor for nuclear localization signals and chromatin.";
RL   J. Biochem. 121:881-889(1997).
RN   [2]
RP   GLYCOSYLATION AT SER-96, AND IDENTIFICATION BY MASS SPECTROMETRY.
RX   PubMed=12438562; DOI=10.1074/mcp.m200048-mcp200;
RA   Wells L., Vosseller K., Cole R.N., Cronshaw J.M., Matunis M.J., Hart G.W.;
RT   "Mapping sites of O-GlcNAc modification using affinity tags for serine and
RT   threonine post-translational modifications.";
RL   Mol. Cell. Proteomics 1:791-804(2002).
RN   [3]
RP   SUBCELLULAR LOCATION.
RX   PubMed=16784888; DOI=10.1016/j.bbalip.2006.05.004;
RA   Bennati A.M., Castelli M., Della Fazia M.A., Beccari T., Caruso D.,
RA   Servillo G., Roberti R.;
RT   "Sterol dependent regulation of human TM7SF2 gene expression: role of the
RT   encoded 3beta-hydroxysterol Delta14-reductase in human cholesterol
RT   biosynthesis.";
RL   Biochim. Biophys. Acta 1761:677-685(2006).
CC   -!- FUNCTION: Catalyzes the reduction of the C14-unsaturated bond of
CC       lanosterol, as part of the metabolic pathway leading to cholesterol
CC       biosynthesis (By similarity). Plays a critical role in myeloid cell
CC       cholesterol biosynthesis which is essential to both myeloid cell growth
CC       and functional maturation (By similarity). Mediates the activation of
CC       NADPH oxidases, perhaps by maintaining critical levels of cholesterol
CC       required for membrane lipid raft formation during neutrophil
CC       differentiation (By similarity). Anchors the lamina and the
CC       heterochromatin to the inner nuclear membrane (By similarity).
CC       {ECO:0000250|UniProtKB:Q14739, ECO:0000250|UniProtKB:Q3U9G9}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=5alpha-cholest-8,14-dien-3beta-ol + H(+) + NADPH = 5alpha-
CC         cholest-8-en-3beta-ol + NADP(+); Xref=Rhea:RHEA:46456,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:16608, ChEBI:CHEBI:57783,
CC         ChEBI:CHEBI:58349, ChEBI:CHEBI:86131;
CC         Evidence={ECO:0000250|UniProtKB:Q14739};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=4,4-dimethyl-5alpha-cholesta-8,24-dien-3beta-ol + NADP(+) =
CC         4,4-dimethyl-5alpha-cholesta-8,14,24-trien-3beta-ol + H(+) + NADPH;
CC         Xref=Rhea:RHEA:18561, ChEBI:CHEBI:15378, ChEBI:CHEBI:17813,
CC         ChEBI:CHEBI:18364, ChEBI:CHEBI:57783, ChEBI:CHEBI:58349; EC=1.3.1.70;
CC         Evidence={ECO:0000250|UniProtKB:Q14739};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=4,4-dimethyl-8,14-cholestadien-3beta-ol + H(+) + NADPH = 4,4-
CC         dimethyl-5alpha-cholest-8-en-3beta-ol + NADP(+);
CC         Xref=Rhea:RHEA:46812, ChEBI:CHEBI:15378, ChEBI:CHEBI:57783,
CC         ChEBI:CHEBI:58349, ChEBI:CHEBI:78904, ChEBI:CHEBI:87044;
CC         Evidence={ECO:0000250|UniProtKB:Q14739};
CC   -!- PATHWAY: Steroid biosynthesis; cholesterol biosynthesis.
CC   -!- SUBUNIT: Interacts with CBX5 (By similarity). Interacts with DNA (By
CC       similarity). Interaction with DNA is sequence independent with higher
CC       affinity for supercoiled and relaxed circular DNA than linear DNA (By
CC       similarity). Interacts with lamin B (By similarity). Interacts with
CC       CLNK (By similarity). {ECO:0000250|UniProtKB:Q14739}.
CC   -!- SUBCELLULAR LOCATION: Nucleus inner membrane
CC       {ECO:0000250|UniProtKB:Q14739}; Multi-pass membrane protein
CC       {ECO:0000255}. Nucleus {ECO:0000250|UniProtKB:Q14739}. Cytoplasm
CC       {ECO:0000250|UniProtKB:Q14739}. Endoplasmic reticulum membrane
CC       {ECO:0000250|UniProtKB:Q14739}. Note=Nucleus; nuclear rim.
CC       {ECO:0000250|UniProtKB:Q14739}.
CC   -!- DOMAIN: The Tudor domain may not recognize methylation marks, but
CC       rather bind unassembled free histone H3.
CC       {ECO:0000250|UniProtKB:P23913}.
CC   -!- PTM: Phosphorylated by CDK1 in mitosis when the inner nuclear membrane
CC       breaks down into vesicles that dissociate from the lamina and the
CC       chromatin (By similarity). It is phosphorylated by different protein
CC       kinases in interphase when the membrane is associated with these
CC       structures (By similarity). Phosphorylation of LBR and HP1 proteins may
CC       be responsible for some of the alterations in chromatin organization
CC       and nuclear structure which occur at various times during the cell
CC       cycle (By similarity). Phosphorylated by SRPK1 (By similarity). In late
CC       anaphase LBR is dephosphorylated, probably by PP1 and/or PP2A, allowing
CC       reassociation with chromatin (By similarity).
CC       {ECO:0000250|UniProtKB:Q14739}.
CC   -!- SIMILARITY: Belongs to the ERG4/ERG24 family. {ECO:0000305}.
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DR   EMBL; AB002466; BAA20471.1; -; mRNA.
DR   PIR; JC5567; JC5567.
DR   RefSeq; NP_604448.1; NM_134453.1.
DR   AlphaFoldDB; O08984; -.
DR   SMR; O08984; -.
DR   BioGRID; 250124; 3.
DR   GlyGen; O08984; 1 site.
DR   iPTMnet; O08984; -.
DR   PhosphoSitePlus; O08984; -.
DR   jPOST; O08984; -.
DR   PRIDE; O08984; -.
DR   GeneID; 89789; -.
DR   KEGG; rno:89789; -.
DR   UCSC; RGD:620813; rat.
DR   CTD; 3930; -.
DR   RGD; 620813; Lbr.
DR   InParanoid; O08984; -.
DR   OrthoDB; 532774at2759; -.
DR   PhylomeDB; O08984; -.
DR   Reactome; R-RNO-191273; Cholesterol biosynthesis.
DR   Reactome; R-RNO-2995383; Initiation of Nuclear Envelope (NE) Reformation.
DR   Reactome; R-RNO-8980692; RHOA GTPase cycle.
DR   Reactome; R-RNO-9013106; RHOC GTPase cycle.
DR   Reactome; R-RNO-9013148; CDC42 GTPase cycle.
DR   Reactome; R-RNO-9013149; RAC1 GTPase cycle.
DR   Reactome; R-RNO-9013404; RAC2 GTPase cycle.
DR   Reactome; R-RNO-9013405; RHOD GTPase cycle.
DR   Reactome; R-RNO-9013408; RHOG GTPase cycle.
DR   Reactome; R-RNO-9013423; RAC3 GTPase cycle.
DR   Reactome; R-RNO-9022692; Regulation of MECP2 expression and activity.
DR   UniPathway; UPA00063; -.
DR   PRO; PR:O08984; -.
DR   Proteomes; UP000002494; Unplaced.
DR   GO; GO:0005737; C:cytoplasm; IDA:RGD.
DR   GO; GO:0005789; C:endoplasmic reticulum membrane; ISS:UniProtKB.
DR   GO; GO:0016021; C:integral component of membrane; ISO:RGD.
DR   GO; GO:0005635; C:nuclear envelope; IDA:RGD.
DR   GO; GO:0005637; C:nuclear inner membrane; IBA:GO_Central.
DR   GO; GO:0031965; C:nuclear membrane; ISO:RGD.
DR   GO; GO:0005643; C:nuclear pore; IDA:RGD.
DR   GO; GO:0005634; C:nucleus; ISO:RGD.
DR   GO; GO:0051087; F:chaperone binding; IPI:RGD.
DR   GO; GO:0070087; F:chromo shadow domain binding; ISO:RGD.
DR   GO; GO:0050613; F:delta14-sterol reductase activity; ISS:UniProtKB.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0070402; F:NADPH binding; ISS:UniProtKB.
DR   GO; GO:0008139; F:nuclear localization sequence binding; IPI:RGD.
DR   GO; GO:0016627; F:oxidoreductase activity, acting on the CH-CH group of donors; IBA:GO_Central.
DR   GO; GO:0006695; P:cholesterol biosynthetic process; ISS:UniProtKB.
DR   GO; GO:0000278; P:mitotic cell cycle; IEP:RGD.
DR   GO; GO:0030223; P:neutrophil differentiation; ISS:UniProtKB.
DR   GO; GO:0016126; P:sterol biosynthetic process; IBA:GO_Central.
DR   CDD; cd04508; TUDOR; 1.
DR   InterPro; IPR001171; ERG24_DHCR-like.
DR   InterPro; IPR019023; Lamin-B_rcpt_of_tudor.
DR   InterPro; IPR018083; Sterol_reductase_CS.
DR   InterPro; IPR002999; Tudor.
DR   Pfam; PF01222; ERG4_ERG24; 1.
DR   Pfam; PF09465; LBR_tudor; 1.
DR   SMART; SM00333; TUDOR; 1.
DR   PROSITE; PS01017; STEROL_REDUCT_1; 1.
DR   PROSITE; PS01018; STEROL_REDUCT_2; 1.
PE   1: Evidence at protein level;
KW   Acetylation; Cholesterol biosynthesis; Cholesterol metabolism; Cytoplasm;
KW   DNA-binding; Endoplasmic reticulum; Glycoprotein; Lipid biosynthesis;
KW   Lipid metabolism; Membrane; Nucleus; Oxidoreductase; Phosphoprotein;
KW   Receptor; Reference proteome; Steroid biosynthesis; Steroid metabolism;
KW   Sterol biosynthesis; Sterol metabolism; Transmembrane; Transmembrane helix.
FT   CHAIN           1..620
FT                   /note="Delta(14)-sterol reductase LBR"
FT                   /id="PRO_0000227911"
FT   TOPO_DOM        1..215
FT                   /note="Nuclear"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        216..236
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        263..283
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        304..324
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        331..351
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        452..472
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        486..506
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        525..547
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        566..586
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   DOMAIN          1..62
FT                   /note="Tudor"
FT   REGION          52..111
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        61..75
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        76..92
FT                   /note="Basic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   MOD_RES         55
FT                   /note="N6-acetyllysine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         59
FT                   /note="Phosphoserine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         67
FT                   /note="Phosphoserine"
FT                   /evidence="ECO:0000250|UniProtKB:Q3U9G9"
FT   MOD_RES         71
FT                   /note="Phosphoserine; by CDK1"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         86
FT                   /note="Phosphoserine; by CDK1"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         88
FT                   /note="Phosphoserine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         99
FT                   /note="Phosphoserine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         101
FT                   /note="Phosphoserine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         123
FT                   /note="Phosphothreonine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         133
FT                   /note="Phosphoserine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         205
FT                   /note="Phosphothreonine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         599
FT                   /note="N6-acetyllysine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   MOD_RES         606
FT                   /note="N6-acetyllysine"
FT                   /evidence="ECO:0000250|UniProtKB:Q14739"
FT   CARBOHYD        96
FT                   /note="O-linked (GlcNAc) serine"
FT                   /evidence="ECO:0000269|PubMed:12438562"
SQ   SEQUENCE   620 AA;  70724 MW;  04BD9FDDCC61ED5D CRC64;
     MPGRKFADGE VVRGRWPGSS LYYEVEILSH DSTSQLYTVK YKDGTELELK ESDIKPLKSF
     KQRKSGSTSS SPSRRRSSRS RSRSRSRSPG RAPKGSRRSV SASYQADAKE KEMRREILQV
     KLTPLVLKPF ANSVSVYNGE PEHMEKSATP PKNKQERVIL STEDSYIATQ YSLRPRREEV
     KPKHRVRGTN LVTRGPVPLG TFQVTTPQRR DLEFGGVPGA LLIMLGLPAC VFLLLLQCAQ
     KDPGLLQFPP PLPALRELWE ARVCGVYLLW FFLQALFSLL PVGKVVEGTP LVDGRRLKYR
     LNGLYAFILT SAAVGTAVFW DIELYYLYTH FLQFALAAIV FSVVLSVYLY ARSLKVPRDE
     LSPASSGNAV YDFFIGRELN PRIGAFDLKF FCELRPGLIG WVVINLVMLL AEMKVQERSA
     PSLAMTLVNS FQLLYVVDAL WFEEALLTTM DIIHDGFGFM LAFGDLVWVP FTYSLQAFYL
     VNHPQDLSWP LTSVIIALKL CGYVIFRCAN SQKNAFRKNP TDPKLAHLKT IPTSTWKSLL
     VSGWWGFVRH PNYLGDLIMA LAWSLPCGFN HILPYFYVIY FTALLIHREA RDEHQCRRKY
     GLAWEKYCQR VPYRIFPYIY
 
 
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