1lln: Difference between revisions
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[[Image:1lln.gif|left|200px]] | [[Image:1lln.gif|left|200px]] | ||
'''1.6A CRYSTAL STRUCTURE OF POKEWEED ANTIVIRAL PROTEIN-III (PAP-III) WITH METHYLATED LYSINES''' | {{Structure | ||
|PDB= 1lln |SIZE=350|CAPTION= <scene name='initialview01'>1lln</scene>, resolution 1.60Å | |||
|SITE= | |||
|LIGAND= | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/rRNA_N-glycosylase rRNA N-glycosylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.22 3.2.2.22] | |||
|GENE= | |||
}} | |||
'''1.6A CRYSTAL STRUCTURE OF POKEWEED ANTIVIRAL PROTEIN-III (PAP-III) WITH METHYLATED LYSINES''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1LLN is a [ | 1LLN is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Phytolacca_americana Phytolacca americana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LLN OCA]. | ||
==Reference== | ==Reference== | ||
High resolution X-ray structure of potent anti-HIV pokeweed antiviral protein-III., Kurinov IV, Uckun FM, Biochem Pharmacol. 2003 May 15;65(10):1709-17. PMID:[http:// | High resolution X-ray structure of potent anti-HIV pokeweed antiviral protein-III., Kurinov IV, Uckun FM, Biochem Pharmacol. 2003 May 15;65(10):1709-17. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12754107 12754107] | ||
[[Category: Phytolacca americana]] | [[Category: Phytolacca americana]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: ribosome inactivating protein]] | [[Category: ribosome inactivating 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 12:32:16 2008'' | ||
Revision as of 13:32, 20 March 2008
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| , resolution 1.60Å | |||||||
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| Activity: | rRNA N-glycosylase, with EC number 3.2.2.22 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
1.6A CRYSTAL STRUCTURE OF POKEWEED ANTIVIRAL PROTEIN-III (PAP-III) WITH METHYLATED LYSINES
OverviewOverview
Pokeweed antiviral protein III (PAP-III), a naturally occurring protein isolated from late summer leaves of the pokeweed plant (Phytolacca americana), has potent anti-HIV activity by an as yet undetermined molecular mechanism. PAP-III belongs to a family of ribosome-inactivating proteins that catalytically deadenylate ribosomal and viral RNA. The chemical modification of PAP-III by reductive methylation of its lysine residues significantly improved the crystal quality for X-ray diffraction studies. Trigonal crystals of the modified PAP-III, with unit cell parameters a=b=80.47A, c=76.21A, were obtained using 30% PEG400 as the precipitant. These crystals contained one enzyme molecule per asymmetric unit and diffracted up to 1.5A, when exposed to a synchrotron source. Here we report the X-ray crystal structure of PAP-III at 1.6A resolution, which was solved by molecular replacement using the homology model of PAP-III as a search model. The fold typical of other ribosome-inactivating proteins is conserved, despite several differences on the surface and in the loop regions. Residues Tyr(69), Tyr(117), Glu(172), and Arg(175) are expected to define the active site of PAP-III. Molecular modeling studies of the interactions of PAP-III and PAP-I with a single-stranded RNA heptamer predicted a more potent anti-HIV activity for PAP-III due to its unique surface topology and more favorable charge distribution in its 20A-long RNA binding active center cleft. In accordance with the predictions of the modeling studies, PAP-III was more potent than PAP-I in depurinating HIV-1 RNA.
About this StructureAbout this Structure
1LLN is a Single protein structure of sequence from Phytolacca americana. Full crystallographic information is available from OCA.
ReferenceReference
High resolution X-ray structure of potent anti-HIV pokeweed antiviral protein-III., Kurinov IV, Uckun FM, Biochem Pharmacol. 2003 May 15;65(10):1709-17. PMID:12754107
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