REX_HTL3P
ID REX_HTL3P Reviewed; 182 AA.
AC Q09SZ8;
DT 28-NOV-2006, integrated into UniProtKB/Swiss-Prot.
DT 17-OCT-2006, sequence version 1.
DT 03-AUG-2022, entry version 33.
DE RecName: Full=Protein Rex;
DE AltName: Full=Rev homolog;
DE AltName: Full=Rex-3;
GN Name=rex;
OS Human T-cell leukemia virus 3 (strain Pyl43) (HTLV-3).
OC Viruses; Riboviria; Pararnavirae; Artverviricota; Revtraviricetes;
OC Ortervirales; Retroviridae; Orthoretrovirinae; Deltaretrovirus.
OX NCBI_TaxID=406769;
OH NCBI_TaxID=9606; Homo sapiens (Human).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=16973592; DOI=10.1128/jvi.00799-06;
RA Calattini S., Chevalier S.A., Duprez R., Afonso P., Froment A., Gessain A.,
RA Mahieux R.;
RT "Human T-cell lymphotropic virus type 3: complete nucleotide sequence and
RT characterization of the human tax3 protein.";
RL J. Virol. 80:9876-9888(2006).
CC -!- FUNCTION: Rex escorts unspliced gag-pro-pol and singly spliced env
CC mRNAs out of the nucleus of infected cells. These mRNAs carry a
CC recognition sequence called Rex responsive element (RxRE or XRE)
CC located at the 3' region of the long terminal repeat (LTR). This
CC function is essential since most HTLV proteins are translated from
CC unspliced or partially spliced pre-mRNAs that cannot exit the nucleus
CC by the pathway used by fully processed cellular mRNAs (By similarity).
CC {ECO:0000250}.
CC -!- SUBUNIT: Homomultimer. {ECO:0000250}.
CC -!- SUBCELLULAR LOCATION: Host nucleus, host nucleolus {ECO:0000250}. Host
CC cytoplasm {ECO:0000250}. Note=The presence of both nuclear import (NLS)
CC and nuclear export (NES) signals leads to continuous shuttling between
CC the nucleus and cytoplasm. {ECO:0000250}.
CC -!- DOMAIN: The RNA-binding motif binds to the RxRE, a complex secondary
CC structure consisting of four stem loops and a long stretch of stem
CC structure, present in incompletely spliced viral pre-mRNAs. This region
CC also contains the NLS which mediates nuclear localization. These
CC overlapping functions prevent Rex bound to RxRE from undesirable return
CC to the nucleus. When Rex binds the RxRE, the NLS becomes masked while
CC the NES remains accessible (By similarity). {ECO:0000250}.
CC -!- SIMILARITY: Belongs to the deltaretrovirus Rex protein family.
CC {ECO:0000305}.
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DR EMBL; DQ462191; ABF18962.1; -; Genomic_DNA.
DR Proteomes; UP000007684; Genome.
DR GO; GO:0030430; C:host cell cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0044196; C:host cell nucleolus; IEA:UniProtKB-SubCell.
DR GO; GO:0003723; F:RNA binding; IEA:UniProtKB-KW.
DR GO; GO:0051028; P:mRNA transport; IEA:UniProtKB-KW.
PE 3: Inferred from homology;
KW Host cytoplasm; Host nucleus; mRNA transport; RNA-binding; Transport.
FT CHAIN 1..182
FT /note="Protein Rex"
FT /id="PRO_0000260487"
FT REGION 1..26
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 57..71
FT /note="Homomultimerization"
FT /evidence="ECO:0000250"
FT REGION 90..182
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 124..132
FT /note="Homomultimerization"
FT /evidence="ECO:0000250"
FT MOTIF 2..19
FT /note="Nuclear localization signal, and RNA-binding (RxRE)"
FT /evidence="ECO:0000250"
FT MOTIF 83..94
FT /note="Nuclear export signal"
FT /evidence="ECO:0000250"
FT COMPBIAS 97..121
FT /note="Pro residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 125..175
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 182 AA; 19389 MW; 28A0E09BEB9B6719 CRC64;
MPKTRKQRSR RPRNQRPSTP WPISQVSDRA FSTGTLSTFS ATVYRPIGAP FLGGFVPLGY
TAMPCWPRAP NIRLPGTPSM DALSAQLYNT LSLGSPPSPP KELPAPSRFS PPQPLLRPPR
FLHPSSTPLK NTPPSETIAS SSPWESSCQP CPSPTLGSGP KTSTPYGAAP SCVSTSISSP
PP