8FA3

Structure of N-terminal of Schistosoma japonicum asparaginyl-tRNA synthetase

Summary for 8FA3

• Entry DOI: 10.2210/pdb8fa3/pdb
• NMR Information: BMRB: 31060
• Descriptor: Asparagine--tRNA ligase (1 entity in total)
• Functional Keywords: beta-hairpin, n-terminal extension, intrinsically disordered region, ligase
• Biological source: Schistosoma japonicum
• Total number of polymer chains: 1
• Total formula weight: 13576.25

Authors

Peck, Y.,Daly, N.L.,Mobli, M. (deposition date: 2022-11-25, release date: 2023-09-06, Last modification date: 2024-09-25)

Primary citation

Peck, Y.,Pickering, D.,Mobli, M.,Liddell, M.J.,Wilson, D.T.,Ruscher, R.,Ryan, S.,Buitrago, G.,McHugh, C.,Love, N.C.,Pinlac, T.,Haertlein, M.,Kron, M.A.,Loukas, A.,Daly, N.L.
Solution structure of the N-terminal extension domain of a Schistosoma japonicum asparaginyl-tRNA synthetase.
J.Biomol.Struct.Dyn., 42:7934-7944, 2024

PubMed Abstract: Several secreted proteins from helminths (parasitic worms) have been shown to have immunomodulatory activities. Asparaginyl-tRNA synthetases are abundantly secreted in the filarial nematode (AsnRS) and the parasitic flatworm (AsnRS), indicating a possible immune function. The suggestion is supported by AsnRS alleviating disease symptoms in a T-cell transfer mouse model of colitis. This immunomodulatory function is potentially related to an N-terminal extension domain present in eukaryotic AsnRS proteins but few structure/function studies have been done on this domain. Here we have determined the three-dimensional solution structure of the N-terminal extension domain of AsnRS. A protein containing the 114 N-terminal amino acids of AsnRS was recombinantly expressed with isotopic labelling to allow structure determination using 3D NMR spectroscopy, and analysis of dynamics using NMR relaxation experiments. Structural comparisons of the N-terminal extension domain of AsnRS with filarial and human homologues highlight a high degree of variability in the β-hairpin region of these eukaryotic N-AsnRS proteins, but similarities in the disorder of the C-terminal regions. Limitations in PrDOS-based intrinsically disordered region (IDR) model predictions were also evident in this comparison. Empirical structural data such as that presented in our study for N-AsnRS will enhance the prediction of sequence-homology based structure modelling and prediction of IDRs in the future.Communicated by Ramaswamy H. Sarma.

PubMed: 37572327
DOI: 10.1080/07391102.2023.2241918

Experimental method

SOLUTION NMR