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1spi

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{{STRUCTURE_1spi| PDB=1spi | SCENE= }}
{{STRUCTURE_1spi| PDB=1spi | SCENE= }}
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'''CRYSTAL STRUCTURE OF SPINACH CHLOROPLAST FRUCTOSE-1,6-BISPHOSPHATASE AT 2.8 ANGSTROMS RESOLUTION'''
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===CRYSTAL STRUCTURE OF SPINACH CHLOROPLAST FRUCTOSE-1,6-BISPHOSPHATASE AT 2.8 ANGSTROMS RESOLUTION===
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==Overview==
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The three-dimensional structure of the spinach chloroplast fructose-1,6-bisphosphatase (Fru-1,6-Pase) has been solved by the molecular replacement method at 2.8 A resolution and refined to a crystallographic R factor of 0.203. The enzyme is composed of four monomers and displays pseudo D2 symmetry. Comparison with the allosteric Fru-1,6-Pase from pig kidney shows orientationally displaced dimers within the quaternary structure of the chloroplast enzyme. When the C1C2 dimers of the two enzymes are superimposed, the C3C4 dimer of the chloroplast enzyme is rotated 20 degrees and 5 degrees relative to the C3C4 dimer of the R and T forms of the pig kidney enzyme, respectively. This new quaternary structure, designated as S, may be described as a super-T form and is outside of the pathway of the allosteric transition which occurs in the pig kidney enzyme, which shows a 15 degrees rotation between T and R forms. Chloroplast Fru-1,6-Pase, unlike the pig kidney enzyme, is insensitive to allosteric transformation by AMP. Structural changes in the AMP binding site involving mainly helices H1, H2, and H3 and the loop between H1 and H2 at the dimer interface interfere with binding of the phosphate of AMP. Finally, the location of cysteines residues provides a basis for a preliminary discussion of the activation of the enzyme by reduction of cysteines via the ferredoxin-thioredoxin f system; this process is complementary to activation by pH changes, Mg2+ or Ca2+, Fru-1,6-P2, and possibly Fru-2,6-P2.
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(as it appears on PubMed at http://www.pubmed.gov), where 7703243 is the PubMed ID number.
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{{ABSTRACT_PUBMED_7703243}}
==About this Structure==
==About this Structure==
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[[Category: Xue, Y.]]
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[[Category: Zhang, Y.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 08:59:13 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 04:02:02 2008''

Revision as of 01:02, 29 July 2008

Image:1spi.png

Template:STRUCTURE 1spi

CRYSTAL STRUCTURE OF SPINACH CHLOROPLAST FRUCTOSE-1,6-BISPHOSPHATASE AT 2.8 ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 7703243

About this Structure

1SPI is a Single protein structure of sequence from Spinacia oleracea. Full crystallographic information is available from OCA.

Reference

Crystal structure of spinach chloroplast fructose-1,6-bisphosphatase at 2.8 A resolution., Villeret V, Huang S, Zhang Y, Xue Y, Lipscomb WN, Biochemistry. 1995 Apr 4;34(13):4299-306. PMID:7703243

Page seeded by OCA on Tue Jul 29 04:02:02 2008

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