1mfq | pdb_00001mfq

Crystal Structure Analysis of a Ternary S-Domain Complex of Human Signal Recognition Particle

spinqualitylabelsall models 1mfq, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mfq is a 3 chain structure with sequence from [1] and Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, MG NonStd Res: CCC Gene: SRP19 (HUMAN), SRP54 (HUMAN) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [SRP54_HUMAN] Binds to the signal sequence of presecretory protein when they emerge from the ribosomes and transfers them to TRAM (translocating chain-associating membrane protein). [SRP19_HUMAN] Signal-recognition-particle assembly, binds directly to 7S RNA and mediates binding of the 54 kDa subunit of the SRP. 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 PubMed The eukaryotic signal recognition particle (SRP) is a cytoplasmic ribonucleoprotein particle that targets secretory and membrane proteins to the endoplasmic reticulum. The binding of SRP54 to the S domain of 7SL RNA is highly dependent on SRP19. Here we present the crystal structure of a human SRP ternary complex consisting of SRP19, the M domain of SRP54 and the S domain of 7SL RNA. Upon binding of the M domain of SRP54 to the 7SL RNA-SRP19 complex, the asymmetric loop of helix 8 in 7SL RNA collapses. The bases of the four nucleotides in the long strand of the asymmetric loop continuously stack and interact with the M domain, whereas the two adenines in the short strand flip out and form two A-minor motifs with helix 6. This stabilizing interaction is only possible when helix 6 has been positioned parallel to helix 8 by the prior binding of SRP19 to the tetraloops of helices 6 and 8. Hence, the crystal structure of the ternary complex suggests why SRP19 is necessary for the stable binding of SRP54 to the S domain RNA. Induced structural changes of 7SL RNA during the assembly of human signal recognition particle.,Kuglstatter A, Oubridge C, Nagai K Nat Struct Biol. 2002 Oct;9(10):740-4. PMID:12244299 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Signal recognition particle protein

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