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2c3z

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[[Image:2c3z.gif|left|200px]]
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{{STRUCTURE_2c3z| PDB=2c3z | SCENE= }}
{{STRUCTURE_2c3z| PDB=2c3z | SCENE= }}
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'''CRYSTAL STRUCTURE OF A TRUNCATED VARIANT OF INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE FROM SULFOLOBUS SOLFATARICUS'''
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===CRYSTAL STRUCTURE OF A TRUNCATED VARIANT OF INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE FROM SULFOLOBUS SOLFATARICUS===
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==Overview==
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Indole-3-glycerol phosphate synthase (IGPS) catalyzes the fifth step in the biosynthesis of tryptophan. It belongs to the large and versatile family of (betaalpha)(8)-barrel enzymes but has an unusual N-terminal extension of about 40 residues. Limited proteolysis with trypsin of IGPS from both Sulfolobus solfataricus (sIGPS) and Thermotoga maritima (tIGPS) removes about 25 N-terminal residues and one of the two extra helices contained therein. To assess the role of the extension, the N-terminally truncated variants sIGPSDelta(1-26) and tIGPSDelta(1-25) were produced recombinantly in Escherichia coli, purified, and characterized in comparison to the wild-type enzymes. Both sIGPSDelta(1-26) and tIGPSDelta(1-25) have unchanged oligomerization states and turnover numbers. In contrast, their Michaelis constants for the substrate 1-(o-carboxyphenylamino)-1-deoxyribulose 5-phosphate are increased, and their resistance toward unfolding induced by heat and guanidinium chloride is decreased. sIGPSDelta(1-26) was crystallized, and its X-ray structure was solved at 2.8 A resolution. The comparison with the known structure of sIGPS reveals small differences that account for its reduced substrate affinity and protein stability. The structure of the core of sIGPSDelta(1-26) is, however, unchanged compared to sIGPS, explaining its retained catalytic activity and consistent with the idea that it evolved from the same ancestor as the phosphoribosyl anthranilate isomerase and the alpha-subunit of tryptophan synthase. These (betaalpha)(8)-barrel enzymes catalyze the reactions preceding and following IGPS in tryptophan biosynthesis but lack an N-terminal extension.
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(as it appears on PubMed at http://www.pubmed.gov), where 16342933 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16342933}}
==About this Structure==
==About this Structure==
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[[Category: Catalytic activity,divergent evolution,tryptophan biosynthesis,lyase,decarboxylase]]
[[Category: Catalytic activity,divergent evolution,tryptophan biosynthesis,lyase,decarboxylase]]
[[Category: Indole-3-glycerol phosphate synthase,protein stability]]
[[Category: Indole-3-glycerol phosphate synthase,protein stability]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 21:12:59 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 04:39:05 2008''

Revision as of 01:39, 29 July 2008

Image:2c3z.png

Template:STRUCTURE 2c3z

CRYSTAL STRUCTURE OF A TRUNCATED VARIANT OF INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE FROM SULFOLOBUS SOLFATARICUS

Template:ABSTRACT PUBMED 16342933

About this Structure

2C3Z is a Single protein structure of sequence from Sulfolobus solfataricus. Full crystallographic information is available from OCA.

Reference

Role of the N-terminal extension of the (betaalpha)8-barrel enzyme indole-3-glycerol phosphate synthase for its fold, stability, and catalytic activity., Schneider B, Knochel T, Darimont B, Hennig M, Dietrich S, Babinger K, Kirschner K, Sterner R, Biochemistry. 2005 Dec 20;44(50):16405-12. PMID:16342933

Page seeded by OCA on Tue Jul 29 04:39:05 2008

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