4FNN | pdb_00004fnn

Structural basis of the binding of fatty acids to peptidoglycan recognition protein, PGRP-S through second binding site.

Sharma, P.,&nbspYamini, S.,&nbspDube, D.,&nbspSingh, A.,&nbspMal, G.,&nbspPandey, N.,&nbspSinha, M.,&nbspSingh, A.K.,&nbspDey, S.,&nbspKaur, P.,&nbspMitra, D.K.,&nbspSharma, S.,&nbspSingh, T.P.

(2013) Arch Biochem Biophys&nbsp529: 1-10

• PubMed:&nbsp23149273&nbspSearch on PubMed
• DOI:&nbsphttps://doi.org/10.1016/j.abb.2012.11.001
• Primary Citation of Related Structures: &nbsp
  3T2V, 3UIL, 3UMQ, 3USX, 4FNN


• PubMed Abstract:&nbsp
  

  Short peptidoglycan recognition protein (PGRP-S) is a member of the mammalian innate immune system. PGRP-S from Camelus dromedarius (CPGRP-S) has been shown to bind to lipopolysaccharide (LPS), lipoteichoic acid (LTA) and peptidoglycan (PGN). Its structure consists of four molecules A, B, C and D with ligand binding clefts situated at A-B and C-D contacts. It has been shown that LPS, LTA and PGN bind to CPGRP-S at C-D contact. The cleft at the A-B contact indicated features that suggested a possible binding of fatty acids including mycolic acid of Mycobacterium tuberculosis. Therefore, binding studies of CPGRP-S were carried out with fatty acids, butyric acid, lauric acid, myristic acid, stearic acid and mycolic acid which showed affinities in the range of 10(-5) to 10(-8) M. Structure determinations of the complexes of CPGRP-S with above fatty acids showed that they bound to CPGRP-S in the cleft at the A-B contact. The flow cytometric studies showed that mycolic acid induced the production of pro-inflammatory cytokines, TNF-α and IFN-γ by CD3+ T cells. The concentrations of cytokines increased considerably with increasing concentrations of mycolic acid. However, their levels decreased substantially on adding CPGRP-S.

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Organizational Affiliation:&nbsp

Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India.