Motion in Aspartate Receptor [aspr]

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Classification Known Subunit Motion, Not Involving Allostery [S-n-2]

1LIH Conformation 1 [ PartsList ]
2LIG Conformation 2 [ PartsList ]

Binding of Aspartate induces Helix 4A to move 1 A relative to Helix 1A. A smaller shearing motion also takes place between subunits 2 and 3 (2 goes with 1 and 3 goes with 4), and there is a hinge region between 2 and 3 that contains two prolines. A helix shift translation of up to 1.5 A and rotations of up to 5 degrees has been observed. Evidence suggests this motion is propagated through the membrane and is involved in signal transduction. The belief is that the propagation of motion through the membrane involves a piston-like motion of the the transmembrane helices (discussed in Lynch and Koshland below).

Particular values describing motion
Creation Date = 19971130
Experimental Methods = x (Traditional x-ray)
Maximum CA displacement (A) = 1.5 (from article)
Maximum Rotation (degrees) = 5 (from article)
Modification Date = 1999-07-27 14:13:50.000

Chervitz SA, Falke JJ (1993). Molecular mechanism of transmembrane signaling by the aspartate receptor: a model. Proc Natl Acad Sci U S A 1996 Mar 1993(6):2545-2550. [Medline info for 96197350]
Milburn MV, Prive GG, Milligan DL, Scott WG, Yeh J, Jancarik J, Koshland DE Jr, Kim SH (1991). Three-dimensional structures of the ligand-binding domain of the bacterial aspartate receptor with and without a ligand. Sci. 254(5036):1342-134 [Medline info for 92073901]
Scott WG, Milligan DL, Milburn MV, Prive GG, Yeh J, Koshland DE Jr, Kim SH (1993). Refined structures of the ligand-binding domain of the aspartate receptor from Salmonella typhimurium. J Mol Biol 1993 Jul 20;232(2):555-573 [Medline info for 93347242]
Lynch BA, Koshland DE Jr. Disulfide cross-linking studies of the transmembrane regions of the aspartate sensory receptor of Escherichia coli. Proc Natl Acad Sci U S A 1991 Dec 1;88(23):10402-6 [Medline info for 1660136]

Data and Graphics
Graphic 1 Aspartate Receptor Graphics Pages (via Colorado)

GO terms associated with structures
Molecular functionsignal transducer activity, transmembrane receptor activity
Cellular componentmembrane
Biological processsignal transduction, chemotaxis

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Copyright 1995-2005 M. Gerstein, W. Krebs, S. Flores, N. Echols, and others
Email: Mark.Gerstein _at_