1m6s

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[[Image:1m6s.jpg|left|200px]]
[[Image:1m6s.jpg|left|200px]]
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{{Structure
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|PDB= 1m6s |SIZE=350|CAPTION= <scene name='initialview01'>1m6s</scene>, resolution 1.8&Aring;
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The line below this paragraph, containing "STRUCTURE_1m6s", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=LLP:2-LYSINE(3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHANE)'>LLP</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Threonine_aldolase Threonine aldolase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.2.5 4.1.2.5] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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|DOMAIN=
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{{STRUCTURE_1m6s| PDB=1m6s | SCENE= }}
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|RELATEDENTRY=[[1lw4|1LW4]], [[1lw5|1LW5]]
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1m6s FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1m6s OCA], [http://www.ebi.ac.uk/pdbsum/1m6s PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1m6s RCSB]</span>
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}}
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'''Crystal Structure Of Threonine Aldolase'''
'''Crystal Structure Of Threonine Aldolase'''
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[[Category: Burley, S K.]]
[[Category: Burley, S K.]]
[[Category: Kielkopf, C L.]]
[[Category: Kielkopf, C L.]]
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[[Category: enzyme]]
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[[Category: Enzyme]]
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[[Category: plp]]
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[[Category: Plp]]
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[[Category: pyridoxal phosphate]]
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[[Category: Pyridoxal phosphate]]
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[[Category: threonine]]
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[[Category: Threonine]]
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[[Category: vitamin b12]]
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[[Category: Vitamin b12]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:42:16 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:12:06 2008''
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Revision as of 21:42, 2 May 2008

Image:1m6s.jpg

Template:STRUCTURE 1m6s

Crystal Structure Of Threonine Aldolase


Overview

L-Threonine acetaldehyde-lyase (threonine aldolase, TA) is a pyridoxal-5'-phosphate-dependent (PLP) enzyme that catalyzes conversion of L-threonine or L-allo-threonine to glycine and acetaldehyde in a secondary glycine biosynthetic pathway. X-ray structures of Thermatoga maritima TA have been determined as the apo-enzyme at 1.8 A resolution and bound to substrate L-allo-threonine and product glycine at 1.9 and 2.0 A resolution, respectively. Despite low pairwise sequence identities, TA is a member of aspartate aminotransferase (AATase) fold family of PLP enzymes. The enzyme forms a 222 homotetramer with the PLP cofactor bound via a Schiff-base linkage to Lys199 within a domain interface. The structure reveals bound calcium and chloride ions that appear to contribute to catalysis and oligomerization, respectively. Although L-threonine and L-allo-threonine are substrates for T. maritima TA, enzymatic assays revealed a strong preference for L-allo-threonine. Structures of the external aldimines with substrate/product reveal a pair of histidines that may provide flexibility in substrate recognition. Variation in the threonine binding pocket may explain preferences for L-allo-threonine versus L-threonine among TA family members.

About this Structure

1M6S is a Single protein structure of sequence from Thermotoga maritima. Full crystallographic information is available from OCA.

Reference

X-ray structures of threonine aldolase complexes: structural basis of substrate recognition., Kielkopf CL, Burley SK, Biochemistry. 2002 Oct 1;41(39):11711-20. PMID:12269813 Page seeded by OCA on Sat May 3 00:42:16 2008

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