|
|
| Line 1: |
Line 1: |
| | | | |
| | ==Solution structure of the Moebius cyclotide kalata B2== | | ==Solution structure of the Moebius cyclotide kalata B2== |
| - | <StructureSection load='1pt4' size='340' side='right'caption='[[1pt4]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> | + | <StructureSection load='1pt4' size='340' side='right'caption='[[1pt4]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| | <table><tr><td colspan='2'>[[1pt4]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oldenlandia_affinis Oldenlandia affinis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PT4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PT4 FirstGlance]. <br> | | <table><tr><td colspan='2'>[[1pt4]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oldenlandia_affinis Oldenlandia affinis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PT4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PT4 FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1nb1|1nb1]], [[1nbj|1nbj]]</div></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1pt4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pt4 OCA], [https://pdbe.org/1pt4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pt4 RCSB], [https://www.ebi.ac.uk/pdbsum/1pt4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pt4 ProSAT]</span></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=1pt4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pt4 OCA], [https://pdbe.org/1pt4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pt4 RCSB], [https://www.ebi.ac.uk/pdbsum/1pt4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pt4 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/KAB2_OLDAF KAB2_OLDAF]] Probably participates in a plant defense mechanism. Inhibitory effect on the growth and development of larvae from Helicoverpa punctigera. Has hemolytic activity.<ref>PMID:15654741</ref>
| + | [https://www.uniprot.org/uniprot/KAB2_OLDAF KAB2_OLDAF] Probably participates in a plant defense mechanism. Inhibitory effect on the growth and development of larvae from Helicoverpa punctigera. Has hemolytic activity.<ref>PMID:15654741</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
| Line 24: |
Line 24: |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| | [[Category: Oldenlandia affinis]] | | [[Category: Oldenlandia affinis]] |
| - | [[Category: Anderson, M A]] | + | [[Category: Anderson MA]] |
| - | [[Category: Craik, D J]] | + | [[Category: Craik DJ]] |
| - | [[Category: Daly, N L]] | + | [[Category: Daly NL]] |
| - | [[Category: Jennings, C V]] | + | [[Category: Jennings CV]] |
| - | [[Category: Rosengren, K J]] | + | [[Category: Rosengren KJ]] |
| - | [[Category: Antibiotic]]
| + | |
| - | [[Category: Cck]]
| + | |
| - | [[Category: Circular protein]]
| + | |
| - | [[Category: Cyclic cystine knot]]
| + | |
| - | [[Category: Cyclotide]]
| + | |
| - | [[Category: Kalata]]
| + | |
| Structural highlights
Function
KAB2_OLDAF Probably participates in a plant defense mechanism. Inhibitory effect on the growth and development of larvae from Helicoverpa punctigera. Has hemolytic activity.[1]
Publication Abstract from PubMed
A large number of macrocyclic miniproteins with diverse biological activities have been isolated from the Rubiaceae, Violaceae, and Cucurbitaceae plant families in recent years. Here we report the three-dimensional structure determined using (1)H NMR spectroscopy and demonstrate potent insecticidal activity for one of these peptides, kalata B2. This peptide is one of the major components of an extract from the leaves of the plant Oldenlandia affinis. The structure consists of a distorted triple-stranded beta-sheet and a cystine knot arrangement of the disulfide bonds and is similar to those described for other members of the cyclotide family. The unique cyclic and knotted nature of these molecules makes them a fascinating example of topologically complex proteins. Examination of the sequences reveals that they can be separated into two subfamilies, one of which contains a larger number of positively charged residues and has a bracelet-like circularization of the backbone. The second subfamily contains a backbone twist due to a cis-peptidyl-proline bond and may conceptually be regarded as a molecular Mobius strip. Kalata B2 is the second putative member of the Mobius cyclotide family to be structurally characterized and has a cis-peptidyl-proline bond, thus validating the suggested name for this subfamily of cyclotides. The observation that kalata B2 inhibits the growth and development of Helicoverpa armigera larvae suggests a role for the cyclotides in plant defense. A comparison of the sequences and structures of kalata B1 and B2 provides insight into the biological activity of these peptides.
Isolation, solution structure, and insecticidal activity of kalata B2, a circular protein with a twist: do Mobius strips exist in nature?,Jennings CV, Rosengren KJ, Daly NL, Plan M, Stevens J, Scanlon MJ, Waine C, Norman DG, Anderson MA, Craik DJ Biochemistry. 2005 Jan 25;44(3):851-60. PMID:15654741[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Jennings CV, Rosengren KJ, Daly NL, Plan M, Stevens J, Scanlon MJ, Waine C, Norman DG, Anderson MA, Craik DJ. Isolation, solution structure, and insecticidal activity of kalata B2, a circular protein with a twist: do Mobius strips exist in nature? Biochemistry. 2005 Jan 25;44(3):851-60. PMID:15654741 doi:10.1021/bi047837h
- ↑ Jennings CV, Rosengren KJ, Daly NL, Plan M, Stevens J, Scanlon MJ, Waine C, Norman DG, Anderson MA, Craik DJ. Isolation, solution structure, and insecticidal activity of kalata B2, a circular protein with a twist: do Mobius strips exist in nature? Biochemistry. 2005 Jan 25;44(3):851-60. PMID:15654741 doi:10.1021/bi047837h
|
