2kgl | pdb_00002kgl
NMR solution structure of MESD
Structural highlights
Function[MESD_MOUSE] Chaperone specifically assisting the folding of beta-propeller/EGF modules within the family of low-density lipoprotein receptors (LDLRs). Acts as a modulator of the Wnt pathway through chaperoning the coreceptors of the canonical Wnt pathway, LRP5 and LRP6, to the plasma membrane. Essential for specification of embryonic polarity and mesoderm induction.[1] [2] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedHow the endoplasmic reticulum (ER) folding machinery coordinates general and specialized chaperones during protein translation and folding remains an important unanswered question. Here, we show two structural domains in MESD, a specialized chaperone for LRP5/6, carry out dual functions. The chaperone domain forms a complex with the immature receptor, maintaining the beta-propeller (BP) domain in an interaction competent state for epidermal growth factor-repeat binding. This promotes proper folding of the BP domain, causing a binding switch from the chaperone domain to the escort domain. The escort complex ensures LRP5/6 safe-trafficking from the ER to the Golgi by preventing premature ligand-binding. Inside the Golgi, the BP domain may contain a histidine switch, regulating MESD dissociation and retrieval. Together, we generate a plausible cell biology picture of the MESD/LRP5/6 pathway, suggesting that it is the specialized chaperones, MESD, that serves as the folding template to drive proper folding and safe trafficking of large multidomain proteins LRP5/6. Two Structural and Functional Domains of MESD Required for Proper Folding and Trafficking of LRP5/6.,Chen J, Liu CC, Li Q, Nowak C, Bu G, Wang J Structure. 2011 Mar 9;19(3):313-23. PMID:21397183[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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