This gene encodes a member of the Sp subfamily of Sp/XKLF transcription factors. Sp family proteins are sequence-specific DNA-binding proteins characterized by an amino-terminal trans-activation domain and three carboxy-terminal zinc finger motifs. This protein contains the least conserved DNA-binding domain within the Sp subfamily of proteins, and its DNA sequence specificity differs from the other Sp proteins. It localizes primarily within subnuclear foci associated with the nuclear matrix, and can activate or in some cases repress expression from different promoters.[7]
^Scohy S, Van Vooren P, Szpirer C, Szpirer J (October 1998). "Assignment1 of Sp genes to rat chromosome bands 7q36 (Sp1), 10q31→q32.1 (Sp2), 3q24→q31 (Sp3) and 6q33 (Sp4) and of the SP2 gene to human chromosome bands 17q21.3→q22 by in situ hybridization".Cytogenet Cell Genet.81 (3–4):273–4.doi:10.1159/000015044.PMID9730617.S2CID46786094.
^Rotheneder H, Geymayer S, Haidweger E (November 1999). "Transcription factors of the Sp1 family: interaction with E2F and regulation of the murine thymidine kinase promoter".J. Mol. Biol.293 (5):1005–15.doi:10.1006/jmbi.1999.3213.PMID10547281.
Rotheneder H, Geymayer S, Haidweger E (2000). "Transcription factors of the Sp1 family: interaction with E2F and regulation of the murine thymidine kinase promoter".J. Mol. Biol.293 (5):1005–15.doi:10.1006/jmbi.1999.3213.PMID10547281.
Phan D, Cheng CJ, Galfione M, Vakar-Lopez F, Tunstead J, Thompson NE, Burgess RR, Najjar SM, Yu-Lee LY, Lin SH (2004). "Identification of Sp2 as a transcriptional repressor of carcinoembryonic antigen-related cell adhesion molecule 1 in tumorigenesis".Cancer Res.64 (9):3072–8.doi:10.1158/0008-5472.CAN-03-3730.PMID15126343.
