The CAZyome of Phytophthora spp.: A comprehensive analysis of the gene complement coding for carbohydrate-active enzymes in species of the genus Phytophthora

DSpace/Manakin Repository

The CAZyome of Phytophthora spp.: A comprehensive analysis of the gene complement coding for carbohydrate-active enzymes in species of the genus Phytophthora

Show simple item record


dc.contributor.author Ospina-Giraldo, Manuel D.
dc.contributor.author Griffith, John G.
dc.contributor.author Laird, Emma W.
dc.contributor.author Mingora, Christina
dc.date.accessioned 2011-06-06T13:53:35Z
dc.date.available 2011-06-06T13:53:35Z
dc.date.issued 2010
dc.identifier.citation Ospina-Giraldo, M. D., et al. (2010) "The CAZyome of Phytophthora spp.: A comprehensive analysis of the gene complement coding for carbohydrate-active enzymes in species of the genus Phytophthora." 11:525. en_US
dc.identifier.uri http://hdl.handle.net/10385/836
dc.description.abstract Background. Enzymes involved in carbohydrate metabolism include Carbohydrate esterases (CE), Glycoside hydrolases (GH), Glycosyl transferases (GT), and Polysaccharide lyases (PL), commonly referred to as carbohydrate-active enzymes (CAZymes). The CE, GH, and PL superfamilies are also known as cell wall degrading enzymes (CWDE) due to their role in the disintegration of the plant cell wall by bacterial and fungal pathogens. In Phytophthora infestans, penetration of the plant cells occurs through a specialized hyphal structure called appressorium; however, it is likely that members of the genus Phytophthora also use CWDE for invasive growth because hyphal forces are below the level of tensile strength exhibited by the plant cell wall. Because information regarding the frequency and distribution of CAZyme coding genes in Phytophthora is currently unknown, we have scanned the genomes of P. infestans, P. sojae, and P. ramorum for the presence of CAZyme-coding genes using a homology-based approach and compared the gene collinearity in the three genomes. In addition, we have tested the expression of several genes coding for CE in cultures grown in vitro. Results. We have found that P. infestans, P. sojae and P. ramorum contain a total of 435, 379, and 310 CAZy homologs; in each genome, most homologs belong to the GH superfamily. Most GH and PL homologs code for enzymes that hydrolyze substances present in the pectin layer forming the middle lamella of the plant cells. In addition, a significant number of CE homologs catalyzing the deacetylation of compounds characteristic of the plant cell cuticle were found. In general, a high degree of gene location conservation was observed, as indicated by the presence of sequential orthologous pairs in the three genomes. Such collinearity was frequently observed among members of the GH superfamily. On the other hand, the CE and PL superfamilies showed less collinearity for some of their putative members. Quantitative PCR experiments revealed that all genes are expressed in P. infestans when this pathogen grown in vitro. However, the levels of expression vary considerably and are lower than the expression levels observed for the constitutive control. Conclusions. In conclusion, we have identified a highly complex set of CAZy homologs in the genomes of P. infestans, P. sojae, and P. ramorum, a significant number of which could play roles critical for pathogenicity, by participating in the degradation of the plant cell wall. en_US
dc.publisher BMC Genomics en_US
dc.title The CAZyome of Phytophthora spp.: A comprehensive analysis of the gene complement coding for carbohydrate-active enzymes in species of the genus Phytophthora en_US
dc.type Article en_US
dc.identifier.doi http://www.biomedcentral.com/1471-2164/11/525

Files in this item

Files Size Format View
Ospina-Giraldo-BMCGenomics-2010.pdf 1.231Mb PDF View/Open

This item appears in the following Collection(s)

Show simple item record

Search LDR


Advanced Search

Browse

My Account