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5itp

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Structure of the periplasmic binding protein NocT from A.tumefaciens in complex with octopine

Structural highlights

5itp is a 2 chain structure with sequence from Agrobacterium tumefaciens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.85Å
Ligands:	, ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NOCT_AGRFC Component of the nopaline active transport system probably consisting of four subunits: Q, M, P and T. This system is also capable of transporting octopine provided that catabolic functions are induced with nopaline.

Publication Abstract from PubMed

We investigated the molecular and ecological mechanisms involved in niche expansion, or generalism, versus specialization in sympatric plant pathogens. Nopaline-type and octopine-type Agrobacterium tumefaciens engineer distinct niches in their plant hosts that provide different nutrients: nopaline or octopine, respectively. Previous studies revealed that nopaline-type pathogens may expand their niche to also assimilate octopine in the presence of nopaline, but consequences of this phenomenon on pathogen dynamics in planta were not known. Here, we provided molecular insight into how the transport protein NocT can bind octopine as well as nopaline, contributing to niche expansion. We further showed that despite the ability for niche expansion, nopaline-type pathogens had no competitive advantage over octopine-type pathogens in co-infected plants. We also demonstrated that a single nucleotide polymorphism in the nocR gene was sufficient to allow octopine assimilation by nopaline-type strains even in absence of nopaline. The evolved nocR bacteria had higher fitness than their ancestor in octopine-rich transgenic plants but lower fitness in tumors induced by octopine-type pathogens. Overall, this work elucidates the specialization of A. tumefaciens to particular opine niches and explains why generalists do not always spread despite the advantage associated with broader nutritional niches.The ISME Journal advance online publication, 1 November 2016; doi:10.1038/ismej.2016.137.

Fitness costs restrict niche expansion by generalist niche-constructing pathogens.,Lang J, Vigouroux A, El Sahili A, Kwasiborski A, Aumont-Nicaise M, Dessaux Y, Shykoff JA, Morera S, Faure D ISME J. 2016 Nov 1. doi: 10.1038/ismej.2016.137. PMID:27801902^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Lang J, Vigouroux A, El Sahili A, Kwasiborski A, Aumont-Nicaise M, Dessaux Y, Shykoff JA, Morera S, Faure D. Fitness costs restrict niche expansion by generalist niche-constructing pathogens. ISME J. 2016 Nov 1. doi: 10.1038/ismej.2016.137. PMID:27801902 doi:http://dx.doi.org/10.1038/ismej.2016.137