1kar: Difference between revisions
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
[[Image:1kar.jpg|left|200px]] | [[Image:1kar.jpg|left|200px]] | ||
'''L-HISTIDINOL DEHYDROGENASE (HISD) STRUCTURE COMPLEXED WITH HISTAMINE (INHIBITOR), ZINC AND NAD (COFACTOR)''' | {{Structure | ||
|PDB= 1kar |SIZE=350|CAPTION= <scene name='initialview01'>1kar</scene>, resolution 2.10Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> and <scene name='pdbligand=HSM:HISTAMINE'>HSM</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Histidinol_dehydrogenase Histidinol dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.23 1.1.1.23] | |||
|GENE= HISD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | |||
}} | |||
'''L-HISTIDINOL DEHYDROGENASE (HISD) STRUCTURE COMPLEXED WITH HISTAMINE (INHIBITOR), ZINC AND NAD (COFACTOR)''' | |||
==Overview== | ==Overview== | ||
| Line 7: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
1KAR is a [ | 1KAR is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KAR OCA]. | ||
==Reference== | ==Reference== | ||
Mechanism of action and NAD+-binding mode revealed by the crystal structure of L-histidinol dehydrogenase., Barbosa JA, Sivaraman J, Li Y, Larocque R, Matte A, Schrag JD, Cygler M, Proc Natl Acad Sci U S A. 2002 Feb 19;99(4):1859-64. Epub 2002 Feb 12. PMID:[http:// | Mechanism of action and NAD+-binding mode revealed by the crystal structure of L-histidinol dehydrogenase., Barbosa JA, Sivaraman J, Li Y, Larocque R, Matte A, Schrag JD, Cygler M, Proc Natl Acad Sci U S A. 2002 Feb 19;99(4):1859-64. Epub 2002 Feb 12. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11842181 11842181] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Histidinol dehydrogenase]] | [[Category: Histidinol dehydrogenase]] | ||
| Line 23: | Line 32: | ||
[[Category: HSM]] | [[Category: HSM]] | ||
[[Category: ZN]] | [[Category: ZN]] | ||
[[Category: 4 | [[Category: 4 domain]] | ||
[[Category: hisd]] | [[Category: hisd]] | ||
[[Category: homodimer]] | [[Category: homodimer]] | ||
| Line 32: | Line 41: | ||
[[Category: zinc]] | [[Category: zinc]] | ||
''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 12:14:52 2008'' | ||
Revision as of 10:14, 20 March 2008
| |||||||||||||
| 1kar, resolution 2.10Å | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ligands: | ZN and HSM | ||||||||||||
| Gene: | HISD (Escherichia coli) | ||||||||||||
| Activity: | Histidinol dehydrogenase, with EC number 1.1.1.23 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
L-HISTIDINOL DEHYDROGENASE (HISD) STRUCTURE COMPLEXED WITH HISTAMINE (INHIBITOR), ZINC AND NAD (COFACTOR)
Overview
The histidine biosynthetic pathway is an ancient one found in bacteria, archaebacteria, fungi, and plants that converts 5-phosphoribosyl 1-pyrophosphate to l-histidine in 10 enzymatic reactions. This pathway provided a paradigm for the operon, transcriptional regulation of gene expression, and feedback inhibition of a pathway. l-histidinol dehydrogenase (HisD, EC ) catalyzes the last two steps in the biosynthesis of l-histidine: sequential NAD-dependent oxidations of l-histidinol to l-histidinaldehyde and then to l-histidine. HisD functions as a homodimer and requires the presence of one Zn(2+) cation per monomer. We have determined the three-dimensional structure of Escherichia coli HisD in the apo state as well as complexes with substrate, Zn(2+), and NAD(+) (best resolution is 1.7 A). Each monomer is made of four domains, whereas the intertwined dimer possibly results from domain swapping. Two domains display a very similar incomplete Rossmann fold that suggests an ancient event of gene duplication. Residues from both monomers form the active site. Zn(2+) plays a crucial role in substrate binding but is not directly involved in catalysis. The active site residue His-327 participates in acid-base catalysis, whereas Glu-326 activates a water molecule. NAD(+) binds weakly to one of the Rossmann fold domains in a manner different from that previously observed for other proteins having a Rossmann fold.
About this Structure
1KAR is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Mechanism of action and NAD+-binding mode revealed by the crystal structure of L-histidinol dehydrogenase., Barbosa JA, Sivaraman J, Li Y, Larocque R, Matte A, Schrag JD, Cygler M, Proc Natl Acad Sci U S A. 2002 Feb 19;99(4):1859-64. Epub 2002 Feb 12. PMID:11842181
Page seeded by OCA on Thu Mar 20 12:14:52 2008
