2lao
From Proteopedia
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| - | [[Image:2lao.jpg|left|200px]] | + | [[Image:2lao.jpg|left|200px]] |
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| - | '''THREE-DIMENSIONAL STRUCTURES OF THE PERIPLASMIC LYSINE-, ARGININE-, ORNITHINE-BINDING PROTEIN WITH AND WITHOUT A LIGAND''' | + | {{Structure |
| + | |PDB= 2lao |SIZE=350|CAPTION= <scene name='initialview01'>2lao</scene>, resolution 1.9Å | ||
| + | |SITE= | ||
| + | |LIGAND= | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
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| + | '''THREE-DIMENSIONAL STRUCTURES OF THE PERIPLASMIC LYSINE-, ARGININE-, ORNITHINE-BINDING PROTEIN WITH AND WITHOUT A LIGAND''' | ||
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==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2LAO is a [ | + | 2LAO is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Salmonella_typhimurium Salmonella typhimurium]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2LAO OCA]. |
==Reference== | ==Reference== | ||
| - | Three-dimensional structures of the periplasmic lysine/arginine/ornithine-binding protein with and without a ligand., Oh BH, Pandit J, Kang CH, Nikaido K, Gokcen S, Ames GF, Kim SH, J Biol Chem. 1993 May 25;268(15):11348-55. PMID:[http:// | + | Three-dimensional structures of the periplasmic lysine/arginine/ornithine-binding protein with and without a ligand., Oh BH, Pandit J, Kang CH, Nikaido K, Gokcen S, Ames GF, Kim SH, J Biol Chem. 1993 May 25;268(15):11348-55. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8496186 8496186] |
[[Category: Salmonella typhimurium]] | [[Category: Salmonella typhimurium]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: amino-acid binding protein]] | [[Category: amino-acid binding protein]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 17:46:27 2008'' |
Revision as of 15:46, 20 March 2008
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THREE-DIMENSIONAL STRUCTURES OF THE PERIPLASMIC LYSINE-, ARGININE-, ORNITHINE-BINDING PROTEIN WITH AND WITHOUT A LIGAND
Overview
Many proteins exhibit a large-scale movement of rigid globular domains. Among these, bacterial periplasmic binding proteins involved in substrate transport, or transport and chemotaxis, can be used as prototypes for understanding the mechanism of the movement. Such movements have been found to be associated with specific functions, such as substrate binding, catalysis, and recognition by other biomolecules. We have determined the three-dimensional structures of the lysine/arginine/ornithine-binding protein (LAO) from Salmonella typhimurium with and without lysine by x-ray crystallographic methods at 1.8- and 1.9-A resolution, respectively. The structures are composed of two lobes held together by two short connecting strands. The two lobes are far apart in the unliganded structure, but in contact with each other in the lysine-liganded structure. The large movement of the lobes is a consequence of a 52 degrees rotation of a single backbone torsion angle in the first connecting strand and of distributed smaller changes of three backbone torsion angles of the second connecting strand. The absence of contact between the lysine and the connecting strands suggests that the ligand does not induce the conformational change directly. We instead propose that the unliganded protein undergoes a dynamic change between an "open" and a "closed" conformation and that the role of the ligand is to stabilize the closed conformation. We discuss the nature of a surface area which might be recognized by the membrane-bound complex of these amino acids transport systems.
About this Structure
2LAO is a Single protein structure of sequence from Salmonella typhimurium. Full crystallographic information is available from OCA.
Reference
Three-dimensional structures of the periplasmic lysine/arginine/ornithine-binding protein with and without a ligand., Oh BH, Pandit J, Kang CH, Nikaido K, Gokcen S, Ames GF, Kim SH, J Biol Chem. 1993 May 25;268(15):11348-55. PMID:8496186
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