4qqh
Crystal structure of C1QL3 in space group H32Crystal structure of C1QL3 in space group H32
Structural highlights
FunctionC1QL3_MOUSE May regulate the number of excitatory synapses that are formed on hippocampus neurons. Has no effect on inhibitory synapses. Plays a role in glucose homeostasis. Via AMPK signaling pathway, stimulates glucose uptake in adipocytes, myotubes and hepatocytes and enhances insulin-stimulated glucose uptake. In a hepatoma cell line, reduces the expression of gluconeogenic enzymes G6PC and PCK1 and hence decreases de novo glucose production.[1] [2] Publication Abstract from PubMedC1q-like (C1QL) -1, -2, and -3 proteins are encoded by homologous genes that are highly expressed in brain. C1QLs bind to brain-specific angiogenesis inhibitor 3 (BAI3), an adhesion-type G-protein coupled receptor that may regulate dendritic morphology by organizing actin filaments. To begin to understand the function of C1QLs, we determined high-resolution crystal structures of the globular C1q-domains of C1QL1, C1QL2, and C1QL3. Each structure is a trimer, with each protomer forming a jelly-roll fold consisting of 10 beta strands. Moreover, C1QL trimers may assemble into higher-order oligomers similar to adiponectin and contain four Ca(2+)-binding sites along the trimeric symmetry axis, as well as additional surface Ca(2+)-binding sites. Mutation of Ca(2+)-coordinating residues along the trimeric symmetry axis lowered the Ca(2+)-binding affinity and protein stability. Our results reveal unique structural features of C1QLs among C1q/TNF superfamily proteins that may be associated with their specific brain functions. Structures of C1q-like Proteins Reveal Unique Features among the C1q/TNF Superfamily.,Ressl S, Vu BK, Vivona S, Martinelli DC, Sudhof TC, Brunger AT Structure. 2015 Apr 7;23(4):688-99. doi: 10.1016/j.str.2015.01.019. Epub 2015 Mar, 5. PMID:25752542[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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