9j0a
Complex structure of ANKRD11/STAG2/RAD21
Structural highlights
FunctionSTAG2_MOUSE Component of cohesin complex, a complex required for the cohesion of sister chromatids after DNA replication. The cohesin complex apparently forms a large proteinaceous ring within which sister chromatids can be trapped. At anaphase, the complex is cleaved and dissociates from chromatin, allowing sister chromatids to segregate. The cohesin complex may also play a role in spindle pole assembly during mitosis (By similarity). Publication Abstract from PubMedAnkyrin Repeat Domain-containing Protein 11 (ANKRD11) is a causative gene for KBG syndrome, a significant risk factor for Cornelia de Lange syndrome (CdLS), and a highly confident autism spectrum disorder gene. Mutations of ANKRD11 lead to developmental abnormalities in multiple organs/tissues including the brain, craniofacial and skeletal bones, and tooth structures with unknown mechanism(s). Here, we find that ANKRD11, via a short peptide fragment in its N-terminal region, binds to the cohesin complex with a high affinity, implicating why ANKRD11 mutation can cause CdLS. The crystal structure of the ANKRD11 peptide in complex with cohesin, together with biochemical experiments, revealed that ANKRD11 competes with CCCTC-binding factor in binding to the cohesin complex. Importantly, a single point mutation in ANKRD11 (Tyr347 to Ala) specifically disrupted the interaction between ANKRD11 and cohesin and perturbed gene expressions in a mouse embryonic stem cell model. Mice carrying the ANKRD11 Y347A mutation display neural and craniofacial anomalies, which mirror clinical phenotypes observed in KBG syndrome patients. Thus, our study reveals how ANKRD11 functions together with cohesin to regulate gene expression and also provides insights into the molecular mechanisms underpinning developmental disorders caused by ANKRD11 mutations. ANKRD11 binding to cohesin suggests a connection between KBG syndrome and Cornelia de Lange syndrome.,Liu H, Li H, Cai Q, Zhang J, Zhong H, Hu G, Zhao S, Lu Y, Mao Y, Lu Y, Yao H, Zhang M Proc Natl Acad Sci U S A. 2025 Jan 28;122(4):e2417346122. doi: , 10.1073/pnas.2417346122. Epub 2025 Jan 23. PMID:39847329[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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