title: PCAF interacts with XBP-1S and mediates XBP-1S-dependent transcription.
abstract: X-box binding protein 1 (XBP-1) is a key regulator required for cellular unfolded protein response (UPR) and plasma cell differentiation. In addition, involvement of XBP-1 in host cell-virus interaction and transcriptional regulation of viruses, such as human T-lymphotropic virus type 1 (HTLV-1), has been revealed recently. Two XBP-1 isoforms, XBP-1U and XBP-1S, which share an identical N-terminal domain, are present in cells. XBP-1S is a transcription activator while XBP-1U is the inactive isoform. Although the transactivation domain of XBP-1S has been identified within the XBP-1S-specific C-terminus, molecular mechanism of the transcriptional activation by XBP-1S still remains unknown. Here we report the interaction between p300/CBP-associated factor (PCAF) and XBP-1S through the C-terminal domain of XBP-1S. No binding between XBP-1U and PCAF is detected. In a cell-based reporter assay, overexpression of PCAF further stimulates the XBP-1S-mediated cellular and HTLV-1 transcription while knockdown of PCAF exhibits the opposite effect. Expression of endogenous XBP-1S cellular target genes, such as BiP and CHOP, is significantly inhibited when PCAF is knocked down. Furthermore, PCAF is recruited to the promoters of XBP-1S target genes in vivo, in a XBP-1S-dependent manner. Collectively, our results demonstrate that PCAF mediates the XBP-1S-dependent transcription through the interaction with XBP-1S.
authors.affiliation: Bioprocessing Technology Institute, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.
authors.forename: Qiao Jing
authors.initials: QJ
authors.lastname: Lew
authors.forename: Kai Ling
authors.initials: KL
authors.lastname: Chu
authors.forename: Jialing
authors.initials: J
authors.lastname: Lee
authors.forename: Poh Ling
authors.initials: PL
authors.lastname: Koh
authors.forename: Vikneswari
authors.initials: V
authors.lastname: Rajasegaran
authors.forename: Jin Yuan
authors.initials: JY
authors.lastname: Teo
authors.forename: Sheng-Hao
authors.initials: SH
authors.lastname: Chao
mesh_terms: D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D000091342:Endoplasmic Reticulum Chaperone BiP; D006360:Heat-Shock Proteins / Q000235:genetics; D015368:Human T-lymphotropic virus 1 / Q000235:genetics; D006801:Humans; D054730:Protein Interaction Domains and Motifs; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors / Q000737:chemistry / Q000378:metabolism*; D015533:Transcriptional Activation; D056811:Unfolded Protein Response / Q000235:genetics; D000071717:X-Box Binding Protein 1; D050880:p300-CBP Transcription Factors / Q000378:metabolism*; D000099224:p300-CBP-Associated Factor
chemical_list: D004268:DNA-Binding Proteins; D000091342:Endoplasmic Reticulum Chaperone BiP; D006360:Heat-Shock Proteins; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors; D000071717:X-Box Binding Protein 1; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor; C000605543:XBP1 protein, human
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