
CASP Target n1008  (with lower case n)

This directory contains files derived from real NMR data for CASP COMMONS target UW_eng, with extensive sidechain assignments.  

The Dihedral and Ambiguous Contact files use the CASP residue numbering.

Specifically, the purification tag is indexed from -17 to -1 before residue 1.

The assessment will only be done for the CASP Target sequence, and it is not necessary to submit coordinates for the N-terminal 17 residue purification tag.

The protein sequence was provided by Brian Koepnick and David Baker at University of Washington.

The 13C,15N enriched protein sample was produced in the laboratories of Gaetano Montelione and Masayori Inouye at Rutgers.  The CASP COMMONS sample production project involved contributions by undergraduate students Briana, and Carlie Hanlon, and staff scientists Natalia Denissova, Keiko Inouye, and Project Leader Yojiro Ishida.

NMR data was collected by G.V.T Swapna, and analyzed by Gaohua Liu.  Data collection included standard triple-resonance NMR experiments for backbone and sidechain amide and methyl resonance assignments, as well as 3D N-NOESY and C-NOESY.  

The NMR analysis included extensive backbone and sidechain H, N, and C resonance assignments. 

This class of resonance assignments is difficult to obtain for larger (15 - 60 kDa) proteins.  However, this small protein (~ 10 kDa) was not perdeuterated, and the NOESY peaks potentially arise from all H-atoms. These contacts have much fewer false positives than were present in related targets N1008 (only backbone and methyl protons assigned).

Ambiguous contact lists were generated from these resonance assignments and real NOESY peak lists using Cycle0 of the program ASDP (formally AutoStructure) [Y.J. Huang, R. Tejero, R. Powers, and G.T. Montelione, G.T. Proteins 62, 587-603 (2006)]

Dihedral Restraints were determined from these backbone resonance assignments using Talo_N [Y. Shen, and A. Bax, J. Biomol. NMR, 56, 227-241(2013)].

There are no RDCs or ECs available for this target.

The high-accuracy reference structure, based on extensive sidechain resonance assignments and additional NMR data, will be provided after this second target Expiration Date.

G. T. Montelione
A. Rosato
H. Valafar
CASP NMR Assessors