1p8b: Difference between revisions
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==SOLUTION STRUCTURE OF PA1B, A 37-AMINO ACID INSECTICIDAL PROTEIN EXTRACTED FROM PEA SEEDS (PISUM SATIVUM)== | |||
<StructureSection load='1p8b' size='340' side='right'caption='[[1p8b]]' scene=''> | |||
| | == Structural highlights == | ||
<table><tr><td colspan='2'>Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P8B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1P8B FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 15 models</td></tr> | |||
| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1p8b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1p8b OCA], [https://pdbe.org/1p8b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1p8b RCSB], [https://www.ebi.ac.uk/pdbsum/1p8b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1p8b ProSAT]</span></td></tr> | ||
</table> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
== | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/p8/1p8b_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1p8b ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
PA1b (pea albumin 1, subunit b) is a 37-amino acid cysteine-rich plant defense protein isolated from pea seeds (Pisum sativum). It induces short-term mortality in several pests, among which the cereal weevils Sitophilus sp. (Sitophilus oryzae, Sitophilus granarius, and Sitophilus zeamais) that are a major nuisance for stored cereals, all over the world. As such, PA1b is the first genuine protein phytotoxin specifically toxic to insects, which makes it a promising tool for seed weevil damage control. We have determined the 3-D solution structure of PA1b, using 2-D homonuclear proton NMR methods and molecular modeling. The primary sequence of the protein does not share similarities with other known toxins. It includes six cysteines forming three disulfide bridges. However, because of PA1b resistance to protease cleavage, conventional methods failed to establish the connectivity pattern. Our first attempts to assign the disulfide network from NOE data alone remained unsuccessful due to the tight packing of the cysteine residues within the core of the molecule. Yet, the use of ambiguous disulfide restraints within ARIA allowed us to establish that PA1b belongs to the inhibitor cystine-knot family. It exhibits the structural features that are characteristic of the knottin fold, namely, a triple-stranded antiparallel beta-sheet with a long flexible loop connecting the first to the second strand and a series of turns. A comparison of the structural properties of PA1b with that of structurally related proteins adopting a knottin fold and exhibiting a diverse range of biological activities shows that the electrostatic and lipophilic potentials at the surface of PA1b are very close to those found for the spider toxin ACTX-Hi:OB4219, thereby suggesting activity on ion channels. | PA1b (pea albumin 1, subunit b) is a 37-amino acid cysteine-rich plant defense protein isolated from pea seeds (Pisum sativum). It induces short-term mortality in several pests, among which the cereal weevils Sitophilus sp. (Sitophilus oryzae, Sitophilus granarius, and Sitophilus zeamais) that are a major nuisance for stored cereals, all over the world. As such, PA1b is the first genuine protein phytotoxin specifically toxic to insects, which makes it a promising tool for seed weevil damage control. We have determined the 3-D solution structure of PA1b, using 2-D homonuclear proton NMR methods and molecular modeling. The primary sequence of the protein does not share similarities with other known toxins. It includes six cysteines forming three disulfide bridges. However, because of PA1b resistance to protease cleavage, conventional methods failed to establish the connectivity pattern. Our first attempts to assign the disulfide network from NOE data alone remained unsuccessful due to the tight packing of the cysteine residues within the core of the molecule. Yet, the use of ambiguous disulfide restraints within ARIA allowed us to establish that PA1b belongs to the inhibitor cystine-knot family. It exhibits the structural features that are characteristic of the knottin fold, namely, a triple-stranded antiparallel beta-sheet with a long flexible loop connecting the first to the second strand and a series of turns. A comparison of the structural properties of PA1b with that of structurally related proteins adopting a knottin fold and exhibiting a diverse range of biological activities shows that the electrostatic and lipophilic potentials at the surface of PA1b are very close to those found for the spider toxin ACTX-Hi:OB4219, thereby suggesting activity on ion channels. | ||
PA1b, an insecticidal protein extracted from pea seeds (Pisum sativum): 1H-2-D NMR study and molecular modeling.,Jouvensal L, Quillien L, Ferrasson E, Rahbe Y, Gueguen J, Vovelle F Biochemistry. 2003 Oct 21;42(41):11915-23. PMID:14556622<ref>PMID:14556622</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1p8b" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Albumin 3D structures|Albumin 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Ferrasson E]] | |||
[[Category: Gueguen J]] | |||
[[Category: Jouvensal L]] | |||
[[Category: Quillien L]] | |||
[[Category: Rahbe Y]] | |||
[[Category: Vovelle F]] | |||
Latest revision as of 10:11, 30 October 2024
SOLUTION STRUCTURE OF PA1B, A 37-AMINO ACID INSECTICIDAL PROTEIN EXTRACTED FROM PEA SEEDS (PISUM SATIVUM)SOLUTION STRUCTURE OF PA1B, A 37-AMINO ACID INSECTICIDAL PROTEIN EXTRACTED FROM PEA SEEDS (PISUM SATIVUM)
Structural highlights
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 PubMedPA1b (pea albumin 1, subunit b) is a 37-amino acid cysteine-rich plant defense protein isolated from pea seeds (Pisum sativum). It induces short-term mortality in several pests, among which the cereal weevils Sitophilus sp. (Sitophilus oryzae, Sitophilus granarius, and Sitophilus zeamais) that are a major nuisance for stored cereals, all over the world. As such, PA1b is the first genuine protein phytotoxin specifically toxic to insects, which makes it a promising tool for seed weevil damage control. We have determined the 3-D solution structure of PA1b, using 2-D homonuclear proton NMR methods and molecular modeling. The primary sequence of the protein does not share similarities with other known toxins. It includes six cysteines forming three disulfide bridges. However, because of PA1b resistance to protease cleavage, conventional methods failed to establish the connectivity pattern. Our first attempts to assign the disulfide network from NOE data alone remained unsuccessful due to the tight packing of the cysteine residues within the core of the molecule. Yet, the use of ambiguous disulfide restraints within ARIA allowed us to establish that PA1b belongs to the inhibitor cystine-knot family. It exhibits the structural features that are characteristic of the knottin fold, namely, a triple-stranded antiparallel beta-sheet with a long flexible loop connecting the first to the second strand and a series of turns. A comparison of the structural properties of PA1b with that of structurally related proteins adopting a knottin fold and exhibiting a diverse range of biological activities shows that the electrostatic and lipophilic potentials at the surface of PA1b are very close to those found for the spider toxin ACTX-Hi:OB4219, thereby suggesting activity on ion channels. PA1b, an insecticidal protein extracted from pea seeds (Pisum sativum): 1H-2-D NMR study and molecular modeling.,Jouvensal L, Quillien L, Ferrasson E, Rahbe Y, Gueguen J, Vovelle F Biochemistry. 2003 Oct 21;42(41):11915-23. PMID:14556622[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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