PSIP1

PSIP1
Available structures
PDB	Ortholog search: PDBe RCSB
List of PDB id codes
	1Z9E, 2B4J, 2M16, 2MSR, 2MTN, 2N3A, 3F9K, 3HPG, 3HPH, 3U88, 3ZEH, 4FU6 Contents Function ; Structure ; Interactions ; References ; Further reading ;
Identifiers
Aliases	PSIP1 , DFS70, LEDGF, PAIP, PSIP2, p52, p75, PC4 and SFRS1 interacting protein 1
External IDs	OMIM: 603620; MGI: 2142116; HomoloGene: 13242; GeneCards: PSIP1; OMA:PSIP1 - orthologs
Gene location (Human)
Chr.	Chromosome 9 (human)
End	15,510,995 bp
Gene location (Mouse)
Chr.	Chromosome 4 (mouse)
End	83,404,696 bp
RNA expression pattern
	Top expressed in
	secondary oocyte; ; ventricular zone; ; ganglionic eminence; ; cerebellar hemisphere; ; right hemisphere of cerebellum; ; Brodmann area 9; ; Achilles tendon; ; optic nerve; ; C1 segment; ; nucleus accumbens;
	Top expressed in
	tail of embryo; ; ventricular zone; ; genital tubercle; ; spermatocyte; ; zygote; ; ganglionic eminence; ; secondary oocyte; ; lateral septal nucleus; ; abdominal wall; ; epiblast;
	More reference expression data
	; ; ; ;
	More reference expression data
Gene ontology
Molecular function	DNA binding ; transcription coactivator activity ; chromatin binding ; protein binding ; supercoiled DNA binding ; RNA binding ;
Cellular component	cytosol ; nuclear periphery ; nucleoplasm ; nucleolus ; nucleus ;
Biological process	regulation of transcription, DNA-templated ; response to heat ; response to oxidative stress ; transcription, DNA-templated ; establishment of integrated proviral latency ; mRNA 5'-splice site recognition ; positive regulation of transcription by RNA polymerase II ; viral process ; nuclear transport ;
	Sources:Amigo / QuickGO
Orthologs
	11168
	101739
	ENSG00000164985
	ENSMUSG00000028484
	O75475
	Q99JF8
	NM_001128217 ; NM_021144 ; NM_033222 ; NM_001317898 ; NM_001317900
	NM_001290527 ; NM_133948 ; NM_001347143 ; NM_001355203
	NP_001121689 ; NP_001304827 ; NP_001304829 ; NP_066967 ; NP_150091
	NP_001277456 ; NP_001334072 ; NP_598709 ; NP_001342132
	Wikidata
View/Edit Human	View/Edit Mouse

Last updated September 13, 2024

PC4 and SFRS1 interacting protein 1, also known as lens epithelium-derived growth factor (LEDGF/p75), dense fine speckles 70kD protein (DFS 70) or transcriptional coactivator p75/p52, is a protein that in humans is encoded by the PSIP1 gene.^[5]^[6]

Function

PSIP1 has not been clearly linked to a specific cellular mechanism. The term LEDGF/p75 (Lens epithelium-derived growth factor) has entered common usage based on the initial characterization of PSIP1, however this is a misnomer, as the protein is present in most tissues and has no direct role in the development of lens epithelium. LEDGF/p75, a transcription coactivator, gained prominence as a host factor that assists HIV integration^[7] and is probably the only integrase interactor whose knock-down severely affects the HIV integration levels.^[8]^[9]^[10] The interaction between HIV integrase and human LEDGF/p75 is a promising target for anti-HIV drug discovery.^[11] LEDGF/p75 recruits MLL complexes to HOX genes to regulate their expression.^[12] LEDGF/p52 is shown to recruit splicing factors to H3K36 trimethylated chromatin to modulate alternative splicing,^[13] also regulates HOTTIP lncRNA, which is shown to regulate HOX genes in cis.^[14]

Structure

LEDGF/p75 is a 60kDa, 530-amino-acid-long protein.^[15] The N-terminal portion of the protein consists of a PWWP domain, a nuclear localization sequence, and two copies of the AT-hook DNA binding motif. The C-terminal portion of LEDGF/p75 contains a structure termed the integrase-binding domain,^[16] which interacts with lentiviral integrase proteins as well as numerous cellular proteins. The N-terminal portion interacts strongly with chromatin, making LEDGF/p75 a constitutively nuclear protein. An isoform of the protein, LEDGF/p52, is produced by alternative splicing. LEDGF/p52 shares the N-terminal 325 amino acids of LEDGF/p75 but lacks the integrase-binding domain.

Interactions

PSIP1 has been shown to interact with the proteins ASF/SF2, JPO2, Cdc7-Dbf4, and POGZ as well as the menin/MLL protein complex.^[17]^[18]

Related Research Articles

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References

1 2 3 GRCh38: Ensembl release 89: ENSG00000164985 – Ensembl, May 2017
1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000028484 – Ensembl, May 2017
↑ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
↑ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
↑ "Entrez Gene: PSIP1 PC4 and SFRS1 interacting protein 1".
↑ Singh DP, Kimura A, Chylack LT, Shinohara T (January 2000). "Lens epithelium-derived growth factor (LEDGF/p75) and p52 are derived from a single gene by alternative splicing". Gene. 242 (1–2): 265–73. doi:10.1016/S0378-1119(99)00506-5. PMID 10721720.
↑ Cherepanov P, Maertens G, Proost P, Devreese B, Van Beeumen J, Engelborghs Y, De Clercq E, Debyser Z (January 2003). "HIV-1 integrase forms stable tetramers and associates with LEDGF/p75 protein in human cells". J. Biol. Chem. 278 (1): 372–81. doi: 10.1074/jbc.M209278200 . PMID 12407101.
↑ Vandekerckhove L, Christ F, Van Maele B, De Rijck J, Gijsbers R, Van den Haute C, Witvrouw M, Debyser Z (February 2006). "Transient and stable knockdown of the integrase cofactor LEDGF/p75 reveals its role in the replication cycle of human immunodeficiency virus". J. Virol. 80 (4): 1886–96. doi:10.1128/JVI.80.4.1886-1896.2006. PMC 1367129 . PMID 16439544.
↑ Shun MC, Raghavendra NK, Vandegraaff N, Daigle JE, Hughes S, Kellam P, Cherepanov P, Engelman A (July 2007). "LEDGF/p75 functions downstream from preintegration complex formation to effect gene-specific HIV-1 integration". Genes Dev. 21 (14): 1767–78. doi:10.1101/gad.1565107. PMC 1920171 . PMID 17639082.
↑ Llano M, Saenz DT, Meehan A, Wongthida P, Peretz M, Walker WH, Teo W, Poeschla EM (October 2006). "An essential role for LEDGF/p75 in HIV integration". Science. 314 (5798): 461–4. Bibcode:2006Sci...314..461L. doi:10.1126/science.1132319. PMID 16959972. S2CID 24756699.
↑ Christ F, Voet A, Marchand A, Nicolet S, Desimmie BA, Marchand D, Bardiot D, Van der Veken NJ, Van Remoortel B, Strelkov SV, De Maeyer M, Chaltin P, Debyser Z (June 2010). "Rational design of small-molecule inhibitors of the LEDGF/p75-integrase interaction and HIV replication". Nat. Chem. Biol. 6 (6): 442–8. doi:10.1038/nchembio.370. PMID 20473303. S2CID 37421436.
↑ Pradeepa, Madapura M.; Grimes, Graeme R.; Taylor, Gillian C. A.; Sutherland, Heidi G.; Bickmore, Wendy A. (2014-08-18). "Psip1/Ledgf p75 restrains Hox gene expression by recruiting both trithorax and polycomb group proteins". Nucleic Acids Research. 42 (14): 9021–9032. doi:10.1093/nar/gku647. ISSN 0305-1048. PMC 4132756 . PMID 25056311.
↑ Pradeepa, Madapura M.; Sutherland, Heidi G.; Ule, Jernej; Grimes, Graeme R.; Bickmore, Wendy A. (2012-05-17). "Psip1/Ledgf p52 Binds Methylated Histone H3K36 and Splicing Factors and Contributes to the Regulation of Alternative Splicing". PLOS Genetics. 8 (5): e1002717. doi: 10.1371/journal.pgen.1002717 . ISSN 1553-7404. PMC 3355077 . PMID 22615581.
↑ Pradeepa, Madapura M.; McKenna, Fionnuala; Taylor, Gillian C. A.; Bengani, Hemant; Grimes, Graeme R.; Wood, Andrew J.; Bhatia, Shipra; Bickmore, Wendy A. (2017-04-06). "Psip1/p52 regulates posterior Hoxa genes through activation of lncRNA Hottip". PLOS Genetics. 13 (4): e1006677. doi: 10.1371/journal.pgen.1006677 . ISSN 1553-7404. PMC 5383017 . PMID 28384324.
↑ Llano M, Morrison J, Poeschla EM (2009). "Virological and Cellular Roles of the Transcriptional Coactivator LEDGF/P75". HIV Interactions with Host Cell Proteins. Current Topics in Microbiology and Immunology. Vol. 339. pp. 125–46. doi:10.1007/978-3-642-02175-6_7. ISBN 978-3-642-02174-9. PMC 3093762 . PMID 20012527.{{cite book}}: |journal= ignored (help)
↑ Cherepanov P, Sun ZY, Rahman S, Maertens G, Wagner G, Engelman A (June 2005). "Solution structure of the HIV-1 integrase-binding domain in LEDGF/p75". Nat. Struct. Mol. Biol. 12 (6): 526–32. doi:10.1038/nsmb937. PMID 15895093. S2CID 20898124.
↑ Ge H, Si Y, Wolffe AP (December 1998). "A novel transcriptional coactivator, p52, functionally interacts with the essential splicing factor ASF/SF2". Mol. Cell. 2 (6): 751–9. doi: 10.1016/S1097-2765(00)80290-7 . PMID 9885563.
↑ Hughes S, Jenkins V, Dar MJ, Engelman A, Cherepanov P (January 2010). "Transcriptional co-activator LEDGF interacts with Cdc7-activator of S-phase kinase (ASK) and stimulates its enzymatic activity". J. Biol. Chem. 285 (1): 541–54. doi: 10.1074/jbc.M109.036491 . PMC 2804203 . PMID 19864417.

Shun MC, Raghavendra NK, Vandegraaff N, Daigle JE, Hughes S, Kellam P, Cherepanov P, Engelman A (July 2007). "LEDGF/p75 functions downstream from preintegration complex formation to effect gene-specific HIV-1 integration". Genes Dev. 21 (14): 1767–78. doi:10.1101/gad.1565107. PMC 1920171 . PMID 17639082.
Van Maele B, Debyser Z (2005). "HIV-1 integration: an interplay between HIV-1 integrase, cellular and viral proteins". AIDS Rev. 7 (1): 26–43. PMID 15875659.
Van Maele B, Busschots K, Vandekerckhove L, Christ F, Debyser Z (2006). "Cellular co-factors of HIV-1 integration". Trends Biochem. Sci. 31 (2): 98–105. doi:10.1016/j.tibs.2005.12.002. PMID 16403635.
Freed EO, Mouland AJ (2006). "The cell biology of HIV-1 and other retroviruses". Retrovirology. 3: 77. doi: 10.1186/1742-4690-3-77 . PMC 1635732 . PMID 17083721.
Ge H, Si Y, Roeder RG (1998). "Isolation of cDNAs encoding novel transcription coactivators p52 and p75 reveals an alternate regulatory mechanism of transcriptional activation". EMBO J. 17 (22): 6723–9. doi:10.1093/emboj/17.22.6723. PMC 1171017 . PMID 9822615.
Ge H, Si Y, Wolffe AP (1998). "A novel transcriptional coactivator, p52, functionally interacts with the essential splicing factor ASF/SF2". Mol. Cell. 2 (6): 751–9. doi: 10.1016/S1097-2765(00)80290-7 . PMID 9885563.
Singh DP, Ohguro N, Kikuchi T, Sueno T, Reddy VN, Yuge K, Chylack LT, Shinohara T (2000). "Lens epithelium-derived growth factor: effects on growth and survival of lens epithelial cells, keratinocytes, and fibroblasts". Biochem. Biophys. Res. Commun. 267 (1): 373–81. doi:10.1006/bbrc.1999.1979. PMID 10623627.
Singh DP, Kimura A, Chylack LT, Shinohara T (2000). "Lens epithelium-derived growth factor (LEDGF/p75) and p52 are derived from a single gene by alternative splicing". Gene. 242 (1–2): 265–73. doi:10.1016/S0378-1119(99)00506-5. PMID 10721720.
Ochs RL, Muro Y, Si Y, Ge H, Chan EK, Tan EM (2000). "Autoantibodies to DFS 70 kd/transcription coactivator p75 in atopic dermatitis and other conditions". J. Allergy Clin. Immunol. 105 (6 Pt 1): 1211–20. doi: 10.1067/mai.2000.107039 . PMID 10856157.
Kubo E, Fatma N, Sharma P, Shinohara T, Chylack LT, Akagi Y, Singh DP (2002). "Transactivation of involucrin, a marker of differentiation in keratinocytes, by lens epithelium-derived growth factor (LEDGF)". J. Mol. Biol. 320 (5): 1053–63. doi:10.1016/S0022-2836(02)00551-X. PMID 12126624.
Wu X, Daniels T, Molinaro C, Lilly MB, Casiano CA (2002). "Caspase cleavage of the nuclear autoantigen LEDGF/p75 abrogates its pro-survival function: implications for autoimmunity in atopic disorders". Cell Death Differ. 9 (9): 915–25. doi: 10.1038/sj.cdd.4401063 . PMID 12181742.
Cherepanov P, Maertens G, Proost P, Devreese B, Van Beeumen J, Engelborghs Y, De Clercq E, Debyser Z (2003). "HIV-1 integrase forms stable tetramers and associates with LEDGF/p75 protein in human cells". J. Biol. Chem. 278 (1): 372–81. doi: 10.1074/jbc.M209278200 . PMID 12407101.
Maertens G, Cherepanov P, Pluymers W, Busschots K, De Clercq E, Debyser Z, Engelborghs Y (2003). "LEDGF/p75 is essential for nuclear and chromosomal targeting of HIV-1 integrase in human cells". J. Biol. Chem. 278 (35): 33528–39. doi: 10.1074/jbc.M303594200 . PMID 12796494.
Maertens G, Cherepanov P, Debyser Z, Engelborghs Y, Engelman A (2004). "Identification and characterization of a functional nuclear localization signal in the HIV-1 integrase interactor LEDGF/p75". J. Biol. Chem. 279 (32): 33421–9. doi: 10.1074/jbc.M404700200 . PMID 15163664.
Beausoleil SA, Jedrychowski M, Schwartz D, Elias JE, Villén J, Li J, Cohn MA, Cantley LC, Gygi SP (2004). "Large-scale characterization of HeLa cell nuclear phosphoproteins". Proc. Natl. Acad. Sci. U.S.A. 101 (33): 12130–5. Bibcode:2004PNAS..10112130B. doi: 10.1073/pnas.0404720101 . PMC 514446 . PMID 15302935.
Llano M, Vanegas M, Fregoso O, Saenz D, Chung S, Peretz M, Poeschla EM (2004). "LEDGF/p75 determines cellular trafficking of diverse lentiviral but not murine oncoretroviral integrase proteins and is a component of functional lentiviral preintegration complexes". J. Virol. 78 (17): 9524–37. doi:10.1128/JVI.78.17.9524-9537.2004. PMC 506940 . PMID 15308744.
Cherepanov P, Devroe E, Silver PA, Engelman A (2004). "Identification of an evolutionarily conserved domain in human lens epithelium-derived growth factor/transcriptional co-activator p75 (LEDGF/p75) that binds HIV-1 integrase". J. Biol. Chem. 279 (47): 48883–92. doi: 10.1074/jbc.M406307200 . PMID 15371438.
Llano M, Delgado S, Vanegas M, Poeschla EM (2004). "Lens epithelium-derived growth factor/p75 prevents proteasomal degradation of HIV-1 integrase". J. Biol. Chem. 279 (53): 55570–7. doi: 10.1074/jbc.M408508200 . PMID 15475359.
Ogawa Y, Sugiura K, Watanabe A, Kunimatsu M, Mishima M, Tomita Y, Muro Y (2004). "Autoantigenicity of DFS70 is restricted to the conformational epitope of C-terminal alpha-helical domain". J. Autoimmun. 23 (3): 221–31. doi:10.1016/j.jaut.2004.07.003. PMID 15501393.
Okamoto M, Ogawa Y, Watanabe A, Sugiura K, Shimomura Y, Aoki N, Nagasaka T, Tomita Y, Muro Y (2004). "Autoantibodies to DFS70/LEDGF are increased in alopecia areata patients". J. Autoimmun. 23 (3): 257–66. doi:10.1016/j.jaut.2004.07.004. PMID 15501396.

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[refGRCh38Ensembl-1] 1 2 3 GRCh38: Ensembl release 89: ENSG00000164985 – Ensembl, May 2017

[refGRCm38Ensembl-2] 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000028484 – Ensembl, May 2017

[3] "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.

[4] "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.

[entrez-5] "Entrez Gene: PSIP1 PC4 and SFRS1 interacting protein 1".

[pmid10721720-6] Singh DP, Kimura A, Chylack LT, Shinohara T (January 2000). "Lens epithelium-derived growth factor (LEDGF/p75) and p52 are derived from a single gene by alternative splicing". Gene. 242 (1–2): 265–73. doi:10.1016/S0378-1119(99)00506-5. PMID 10721720.

[pmid12407101-7] Cherepanov P, Maertens G, Proost P, Devreese B, Van Beeumen J, Engelborghs Y, De Clercq E, Debyser Z (January 2003). "HIV-1 integrase forms stable tetramers and associates with LEDGF/p75 protein in human cells". J. Biol. Chem. 278 (1): 372–81. doi: 10.1074/jbc.M209278200 . PMID 12407101.

[pmid16439544-8] Vandekerckhove L, Christ F, Van Maele B, De Rijck J, Gijsbers R, Van den Haute C, Witvrouw M, Debyser Z (February 2006). "Transient and stable knockdown of the integrase cofactor LEDGF/p75 reveals its role in the replication cycle of human immunodeficiency virus". J. Virol. 80 (4): 1886–96. doi:10.1128/JVI.80.4.1886-1896.2006. PMC 1367129 . PMID 16439544.

[pmid17639082-9] Shun MC, Raghavendra NK, Vandegraaff N, Daigle JE, Hughes S, Kellam P, Cherepanov P, Engelman A (July 2007). "LEDGF/p75 functions downstream from preintegration complex formation to effect gene-specific HIV-1 integration". Genes Dev. 21 (14): 1767–78. doi:10.1101/gad.1565107. PMC 1920171 . PMID 17639082.

[pmid16959972-10] Llano M, Saenz DT, Meehan A, Wongthida P, Peretz M, Walker WH, Teo W, Poeschla EM (October 2006). "An essential role for LEDGF/p75 in HIV integration". Science. 314 (5798): 461–4. Bibcode:2006Sci...314..461L. doi:10.1126/science.1132319. PMID 16959972. S2CID 24756699.

[pmid20473303-11] Christ F, Voet A, Marchand A, Nicolet S, Desimmie BA, Marchand D, Bardiot D, Van der Veken NJ, Van Remoortel B, Strelkov SV, De Maeyer M, Chaltin P, Debyser Z (June 2010). "Rational design of small-molecule inhibitors of the LEDGF/p75-integrase interaction and HIV replication". Nat. Chem. Biol. 6 (6): 442–8. doi:10.1038/nchembio.370. PMID 20473303. S2CID 37421436.

[12] Pradeepa, Madapura M.; Grimes, Graeme R.; Taylor, Gillian C. A.; Sutherland, Heidi G.; Bickmore, Wendy A. (2014-08-18). "Psip1/Ledgf p75 restrains Hox gene expression by recruiting both trithorax and polycomb group proteins". Nucleic Acids Research. 42 (14): 9021–9032. doi:10.1093/nar/gku647. ISSN 0305-1048. PMC 4132756 . PMID 25056311.

[13] Pradeepa, Madapura M.; Sutherland, Heidi G.; Ule, Jernej; Grimes, Graeme R.; Bickmore, Wendy A. (2012-05-17). "Psip1/Ledgf p52 Binds Methylated Histone H3K36 and Splicing Factors and Contributes to the Regulation of Alternative Splicing". PLOS Genetics. 8 (5): e1002717. doi: 10.1371/journal.pgen.1002717 . ISSN 1553-7404. PMC 3355077 . PMID 22615581.

[14] Pradeepa, Madapura M.; McKenna, Fionnuala; Taylor, Gillian C. A.; Bengani, Hemant; Grimes, Graeme R.; Wood, Andrew J.; Bhatia, Shipra; Bickmore, Wendy A. (2017-04-06). "Psip1/p52 regulates posterior Hoxa genes through activation of lncRNA Hottip". PLOS Genetics. 13 (4): e1006677. doi: 10.1371/journal.pgen.1006677 . ISSN 1553-7404. PMC 5383017 . PMID 28384324.

[pmid20012527-15] Llano M, Morrison J, Poeschla EM (2009). "Virological and Cellular Roles of the Transcriptional Coactivator LEDGF/P75". HIV Interactions with Host Cell Proteins. Current Topics in Microbiology and Immunology. Vol. 339. pp. 125–46. doi:10.1007/978-3-642-02175-6_7. ISBN 978-3-642-02174-9. PMC 3093762 . PMID 20012527.{{cite book}}: |journal= ignored (help)

[pmid15895093-16] Cherepanov P, Sun ZY, Rahman S, Maertens G, Wagner G, Engelman A (June 2005). "Solution structure of the HIV-1 integrase-binding domain in LEDGF/p75". Nat. Struct. Mol. Biol. 12 (6): 526–32. doi:10.1038/nsmb937. PMID 15895093. S2CID 20898124.

[pmid9885563-17] Ge H, Si Y, Wolffe AP (December 1998). "A novel transcriptional coactivator, p52, functionally interacts with the essential splicing factor ASF/SF2". Mol. Cell. 2 (6): 751–9. doi: 10.1016/S1097-2765(00)80290-7 . PMID 9885563.

[pmid19864417-18] Hughes S, Jenkins V, Dar MJ, Engelman A, Cherepanov P (January 2010). "Transcriptional co-activator LEDGF interacts with Cdc7-activator of S-phase kinase (ASK) and stimulates its enzymatic activity". J. Biol. Chem. 285 (1): 541–54. doi: 10.1074/jbc.M109.036491 . PMC 2804203 . PMID 19864417.

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