Structural highlights
Function[SYDP_ECOLI] Interacts with the SecY protein in vivo. May bind preferentially to an uncomplexed state of SecY, thus functioning either as a chelating agent for excess SecY in the cell or as a regulatory factor that negatively controls the translocase function. 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 PubMedThe Syd protein has been implicated in the Sec-dependent transport of polypeptides across the bacterial inner membrane. Using Nanodiscs, we here provide direct evidence that Syd binds the SecY complex, and we demonstrate that interaction involves the two electropositive and cytosolic loops of the SecY subunit. We solve the crystal structure of Syd and together with cysteine cross-link analysis, we show that a conserved concave and electronegative groove constitutes the SecY-binding site. At the membrane, Syd decreases the activity of the translocon containing loosely associated SecY-SecE subunits, whereas in detergent solution Syd disrupts the SecYEG heterotrimeric associations. These results support the role of Syd in proofreading the SecY complex biogenesis and point to the electrostatic nature of the Sec channel interaction with its cytosolic partners. Structure, binding, and activity of Syd, a SecY-interacting protein.,Dalal K, Nguyen N, Alami M, Tan J, Moraes TF, Lee WC, Maurus R, Sligar SS, Brayer GD, Duong F J Biol Chem. 2009 Mar 20;284(12):7897-902. Epub 2009 Jan 12. PMID:19139097[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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