2i0w
From Proteopedia
Crystal structure analysis of NP24-I, a thaumatin-like protein
Structural highlights
FunctionNP24_SOLLC Has antifungal activity against P.betae and F.dahliae. May be involved in disease resistance in tomatoes and/or have a possible role in fruit development and ripening.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe crystal structure of NP24-I, an isoform of the thaumatin-like protein (TLP) NP24 from tomato, has been reported. A prominent acidic cleft is observed between domains I and II of the three-domain structure of this antifungal protein, a feature common to other antifungal TLPs. The defensive role of the TLPs has also been attributed to their beta-1,3-glucanase activity and here too the acidic cleft is reported to play a vital role. NP24 is known to bind beta-glucans and so a linear beta-1,3-glucan molecule has been docked in the interdomain cleft of NP24-I. From the docked complex it is observed that the beta-glucan chain is so positioned in the cleft that a Glu and Asp residue on either side of it may form a catalytic pair to cause the cleavage of a glycosidic bond. NP24 has been reported to be an allergenic protein and an allergenic motif could be identified on the surface of the helical domain II of NP24-I. In addition, some allergenic motifs bearing high similarity/identity with some predicted Ig-E binding motifs of closely related allergenic TLPs like Jun a 3 (Juniperus ashei, from mountain cedar pollen) and banana-TLP have been identified on the molecular surface of NP24-I. Crystal structure analysis of NP24-I: a thaumatin-like protein.,Ghosh R, Chakrabarti C Planta. 2008 Oct;228(5):883-90. Epub 2008 Jul 24. PMID:18651170[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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