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NMR processing:
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PINE
Side-chains:
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NOEs:
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UNIO Candid
ASDP
Structure from NMR restraints:
Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
UNIO ATNOS-Candid
UNIO Candid
Fragment-based:
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Template-based:
GeNMR
I-TASSER
Refinement:
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Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
CS23D
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Torsion angles from chemical shifts:
Preditor
TALOS
Promega- Proline
Secondary structure from chemical shifts:
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MICS caps, β-turns
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Flexibility from chemical shifts:
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Chemical shifts re-referencing:
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SAVES2 or SAVES4
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Methyl S2
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Molecular dynamics:
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From structure:
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ArShift- Aromatic
ShiftS
Proshift
PPM
CheShift-2- Cα
From sequence:
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Camcoil
Poulsen_rc_CS
Disordered proteins:
MAXOCC
Format conversion & validation:
CCPN
From NMR-STAR 3.1
Validate NMR-STAR 3.1
NMR sample preparation:
Protein disorder:
DisMeta
Protein solubility:
camLILA
ccSOL
Camfold
camGroEL
Zyggregator
Isotope labeling:
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Solid-state NMR:
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Default Solution structure of Pisum sativum defensin 1 by high resolution NMR: plant defensin

Solution structure of Pisum sativum defensin 1 by high resolution NMR: plant defensins, identical backbone with different mechanisms of action.

Related Articles Solution structure of Pisum sativum defensin 1 by high resolution NMR: plant defensins, identical backbone with different mechanisms of action.

J Mol Biol. 2002 Jan 25;315(4):749-57

Authors: Almeida MS, Cabral KM, Kurtenbach E, Almeida FC, Valente AP

Pisum sativum defensin 1 (Psd1) is a 46 amino acid residue plant defensin isolated from seeds of pea. The three-dimensional structure in solution of Psd1 was determined by two-dimensional NMR data recorded at 600 MHz. Experimental restraints were used for structure calculation using CNS and torsion-angle molecular dynamics. The 20 lowest energy structures were selected and further subjected to minimization, giving a root-mean-square deviation of 0.78(+/- 0.22) A in the backbone and 1.91(+/-0.60) A for over all atoms of the molecule. The protein has a globular fold with a triple-stranded antiparalell beta-sheet and an alpha-helix (from residue Asn17 to Leu27). Psd1 presents the so called "cysteine stabilized alpha/beta motif" and presents identical three-dimensional topology in the backbone with other defensins and neurotoxins. Comparison of the electrostatic surface potential among proteins with high three-dimensional (selected using the softwares TOP and DALI) topology gave insights into the mode of action of Psd1. The surface topologies between proteins that present antifungal activity or sodium channel inhibiting activity are different. On the other hand the surface topology presents several common features with potassium channel inhibitors, suggesting that Psd1 presents this activity. Other common features with potassium channel inhibitors were found including the presence of a lysine residue essential for inhibitory activity. The identity of Psd1 in primary sequence is not enough to infer a mechanism of action, in contrast with the strategy proposed here.

PMID: 11812144 [PubMed - indexed for MEDLINE]



Source: PubMed
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