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NMR processing:
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NOEs:
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UNIO Candid
ASDP
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Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
UNIO ATNOS-Candid
UNIO Candid
Fragment-based:
BMRB CS-Rosetta
Rosetta-NMR (Robetta)
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GeNMR
I-TASSER
Refinement:
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Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
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Torsion angles from chemical shifts:
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Promega- Proline
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d2D
PECAN
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From structure:
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ArShift- Aromatic
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Proshift
PPM
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From sequence:
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Disordered proteins:
MAXOCC
Format conversion & validation:
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From NMR-STAR 3.1
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NMR sample preparation:
Protein disorder:
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Protein solubility:
camLILA
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camGroEL
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Old 08-22-2010, 05:08 PM
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Default Solution secondary structure of a bacterially expressed peptide from the receptor bin

Solution secondary structure of a bacterially expressed peptide from the receptor binding domain of Pseudomonas aeruginosa pili strain PAK: A heteronuclear multidimensional NMR study.

Related Articles Solution secondary structure of a bacterially expressed peptide from the receptor binding domain of Pseudomonas aeruginosa pili strain PAK: A heteronuclear multidimensional NMR study.

Biochemistry. 1997 Oct 21;36(42):12791-801

Authors: Campbell AP, Bautista DL, Tripet B, Wong WY, Irvin RT, Hodges RS, Sykes BD

The C-terminal receptor binding region of Pseudomonas aeruginosa pilin protein strain PAK (residues 128-144) has recently been the target for the design of a synthetic peptide vaccine effective against multiple strains of P. aeruginosa infection. We have successfully cloned and bacterially expressed a 15N-labeled PAK pilin peptide spanning residues 128-144 of the intact PAK pilin protein, PAK 128-144(Hs145), and have determined the solution secondary structure of this peptide using heteronuclear multidimensional NMR spectroscopy. The oxidized recombinant peptide exists as a major (trans) and minor (cis) species in solution, arising from isomerization around the Ile138-Pro139 peptide bond. The pattern of NOEs, temperature coefficients, and coupling constants observed for the trans isomer demonstrate the presence of a type I beta-turn and a type II beta-turn spanning Asp134-Glu-Gln-Phe137 and Pro139-Lys-Gly-Cys142, respectively. This is in agreement with the NMR solution structure of the trans isomer of a synthetic PAK 128-144 peptide which showed a type I and a type II beta-turn in these same regions of the sequence [McInnes, C., Sönnichsen, F. D., Kay, C. M., Hodges, R. S., and Sykes, B. D. (1993) Biochemistry 32, 13432-13440; Campbell, A. P., McInnes, C., Hodges, R. S., and Sykes, B. D. (1995) Biochemistry 34, 16255-16268]. The pattern of NOEs, temperature coefficients, and coupling constants observed for the cis isomer also demonstrate a type II beta-turn spanning Pro139-Lys-Gly-Cys142, but suggest a second beta-turn spanning Asp132-Gln-Asp-Glu135. Thus, the cis isomer may also possess a double-turn motif (like the trans isomer), but with different spacing between the turns and a different placement of the first turn in the sequence. The discovery of a double-turn motif in the trans (and cis) recombinant PAK pilin peptide is an extremely important result since the double turn has been implicated as a structural requirement for the recognition of both receptor and antibody. These results pave the way for future isotope-edited NMR studies of the labeled recombinant PAK pilin peptide bound to antibody and receptor, studies integral to the design of an effective synthetic peptide vaccine.

PMID: 9335536 [PubMed - indexed for MEDLINE]



Source: PubMed
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