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2q3n

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Revision as of 06:59, 3 June 2020

Agglutinin from Abrus Precatorius (APA-I)

Structural highlights

2q3n is a 2 chain structure with sequence from Abrus precatorius. This structure supersedes the now removed PDB entry 2amz. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Activity:	rRNA N-glycosylase, with EC number 3.2.2.22
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[AGGL_ABRPR] The A chain is responsible for inhibiting protein synthesis through the catalytic inactivation of 60S ribosomal subunits by removing adenine from position 4,324 of 28S rRNA (By similarity). Less toxic than abrin-a.^[1] [UniProtKB:P28590] The B chain is a galactose-specific lectin that facilitates the binding to the cell membrane that precedes endocytosis (By similarity).^[2] [UniProtKB:P28590]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Abrin and agglutinin-I from the seeds of Abrus precatorius are type II ribosome-inactivating proteins that inhibit protein synthesis in eukaryotic cells. The two toxins share a high degree of sequence similarity; however, agglutinin-I is weaker in its activity. We compared the kinetics of protein synthesis inhibition by abrin and agglutinin-I in two different cell lines and found that approximately 200-2000-fold higher concentration of agglutinin-I is needed for the same degree of inhibition. Like abrin, agglutinin-I also induced apoptosis in the cells by triggering the intrinsic mitochondrial pathway, although at higher concentrations as compared with abrin. The reason for the decreased toxicity of agglutinin-I became apparent on the analysis of the crystal structure of agglutinin-I obtained by us in comparison with that of the reported structure of abrin. The overall protein folding of agglutinin-I is similar to that of abrin-a with a single disulfide bond holding the toxic A subunit and the lectin-like B-subunit together, constituting a heterodimer. However, there are significant differences in the secondary structural elements, mostly in the A chain. The substitution of Asn-200 in abrin-a with Pro-199 in agglutinin-I seems to be a major cause for the decreased toxicity of agglutinin-I. This perhaps is not a consequence of any kink formation by a proline residue in the helical segment, as reported by others earlier, but due to fewer interactions that proline can possibly have with the bound substrate.

Structure-function analysis and insights into the reduced toxicity of Abrus precatorius agglutinin I in relation to abrin.,Bagaria A, Surendranath K, Ramagopal UA, Ramakumar S, Karande AA J Biol Chem. 2006 Nov 10;281(45):34465-74. Epub 2006 Jun 13. PMID:16772301^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Liu CL, Tsai CC, Lin SC, Wang LI, Hsu CI, Hwang MJ, Lin JY. Primary structure and function analysis of the Abrus precatorius agglutinin A chain by site-directed mutagenesis. Pro(199) Of amphiphilic alpha-helix H impairs protein synthesis inhibitory activity. J Biol Chem. 2000 Jan 21;275(3):1897-901. PMID:10636890
↑ Liu CL, Tsai CC, Lin SC, Wang LI, Hsu CI, Hwang MJ, Lin JY. Primary structure and function analysis of the Abrus precatorius agglutinin A chain by site-directed mutagenesis. Pro(199) Of amphiphilic alpha-helix H impairs protein synthesis inhibitory activity. J Biol Chem. 2000 Jan 21;275(3):1897-901. PMID:10636890
↑ Bagaria A, Surendranath K, Ramagopal UA, Ramakumar S, Karande AA. Structure-function analysis and insights into the reduced toxicity of Abrus precatorius agglutinin I in relation to abrin. J Biol Chem. 2006 Nov 10;281(45):34465-74. Epub 2006 Jun 13. PMID:16772301 doi:http://dx.doi.org/10.1074/jbc.M601777200

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2q3n"

@@ Line 1: / Line 1: @@
 ==Agglutinin from Abrus Precatorius (APA-I)==
-<StructureSection load='2q3n' size='340' side='right' caption='[[2q3n]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
+<StructureSection load='2q3n' size='340' side='right'caption='[[2q3n]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[2q3n]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Abrus_precatorius Abrus precatorius]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=2amz 2amz]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Q3N OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2Q3N FirstGlance]. <br>
+<table><tr><td colspan='2'>[[2q3n]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Abrus_precatorius Abrus precatorius]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=2amz 2amz]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Q3N OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=2Q3N FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[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] </span></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2q3n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2q3n OCA], [http://pdbe.org/2q3n PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2q3n RCSB], [http://www.ebi.ac.uk/pdbsum/2q3n PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2q3n ProSAT]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=2q3n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2q3n OCA], [http://pdbe.org/2q3n PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2q3n RCSB], [http://www.ebi.ac.uk/pdbsum/2q3n PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2q3n ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 31: / Line 31: @@
 ==See Also==
-*[[Agglutinin|Agglutinin]]
+*[[Agglutinin 3D structures|Agglutinin 3D structures]]
 == References ==
 <references/>
@@ Line 37: / Line 37: @@
 </StructureSection>
 [[Category: Abrus precatorius]]
+[[Category: Large Structures]]
 [[Category: RRNA N-glycosylase]]
 [[Category: Bagaria, A]]

2q3n

From Proteopedia

Revision as of 06:59, 3 June 2020

Agglutinin from Abrus Precatorius (APA-I)

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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