{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSGTA plays a central role in maintaining cellular proteostasis by coordinating multiple quality‐control pathways. It functions as an essential co‐chaperone within the Bag6 complex to capture misfolded and mislocalized hydrophobic proteins from the endoplasmic reticulum and the cytosol. In this context, SGTA’s noncanonical ubiquitin‐like binding domain helps recruit and load substrates onto Bag6, thereby preventing aggregation and directing proteins toward either refolding or regulated degradation. In addition, SGTA dynamically counteracts BAG6‐dependent ubiquitination of mislocalized and tail‐anchored proteins—often by delaying their modification—and collaborates with other components (including USP5) to determine whether these proteins are deubiquitylated for successful membrane insertion or cleared by the proteasome. Moreover, through its association with the 19S proteasomal subunit Rpn13 and via transient interactions during ribosome synthesis, SGTA contributes both to the extraction of viral particles across the ER membrane and to the reduction of co‐translational ubiquitination, as well as to the clearance of aggregate‐prone species."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBesides its role in protein quality control, SGTA is a key modulator of steroid receptor signaling and cell‐cycle processes. By directly binding to the androgen receptor (AR)—for example, through interaction with its hinge region—SGTA promotes the receptor’s cytoplasmic retention, thereby dampening ligand‐independent transcription and fine‐tuning sensitivity to androgens. This modulatory activity, which also extends to the glucocorticoid and progesterone receptors, appears to influence the balance between cytoplasmic and nuclear receptor pools and is implicated in conditions ranging from prostate cancer progression to polycystic ovary syndrome. Altered SGTA expression is likewise associated with aberrant cell proliferation in esophageal, breast, and ovarian tumors, reflecting its broader role as a molecular rheostat that interacts with chaperones (such as Hsp70 and Hsp90) and regulatory factors to impact receptor folding, downstream signaling, and cell‐cycle transitions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies have shed light on the broader regulatory and structural roles of SGTA. As a cochaperone, SGTA associates directly with Hsp70 and Hsp90—interactions that not only modulate chaperone ATPase activity but also influence downstream events such as guanine nucleotide exchange in G‐protein signaling. Moreover, overexpression of SGTA has been linked to enhanced apoptosis and has been shown to be critical for proper mitotic progression, with its depletion leading to chromosome misalignment and cell‐cycle arrest. Structural analyses of the TPR domain of SGTA, including its crystallization, provide a molecular framework for understanding these interactions and their consequences. Finally, SGTA also engages with receptor endocytosis motifs, further underscoring its multifaceted role in regulating protein homeostasis and signal transduction."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yue Xu, Mengli Cai, Yingying Yang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "SGTA recognizes a noncanonical ubiquitin-like domain in the Bag6-Ubl4A-Trc35 complex to promote endoplasmic reticulum-associated degradation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Rep (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.celrep.2012.11.010"}], "href": "https://doi.org/10.1016/j.celrep.2012.11.010"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23246001"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23246001"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Pawel Leznicki, Stephen High "}, {"type": "b", "children": [{"type": "t", "text": "SGTA antagonizes BAG6-mediated protein triage."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Proc Natl Acad Sci U S A (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1073/pnas.1209997109"}], "href": "https://doi.org/10.1073/pnas.1209997109"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23129660"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23129660"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Justin W Chartron, David G VanderVelde, William M Clemons "}, {"type": "b", "children": [{"type": "t", "text": "Structures of the Sgt2/SGTA dimerization domain with the Get5/UBL4A UBL domain reveal an interaction that forms a conserved dynamic interface."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Rep (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.celrep.2012.10.010"}], "href": "https://doi.org/10.1016/j.celrep.2012.10.010"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23142665"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23142665"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Lydia Wunderley, Pawel Leznicki, Aishwarya Payapilly, et al. 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