Cloning of a pectate lyase gene from Xanthomonas campestris pv. malvacearum and comparison of its sequence relationship with pel genes of soft-rot Erwinia and Pseudomonas. 1996

C H Liao, and T D Gaffney, and S P Bradley, and L C Wong
Eastern Regional Research Center, USDA-ARS, Philadelphia, PA 19118, USA.

The cotton blight pathogen, Xanthomonas campestris pv. malvacearum strain B414, produces an extracellular pectate lyase (Pel) with an estimated M(r) of 41,000 and pI of 9.7. The gene coding for this enzyme initially identified in a 1.8-kb PstI genomic DNA fragment was cloned. The nucleotide sequences of this 1.8-kb fragment and two pel genes previously cloned from Pseudomonas fluorescens and P. viridiflava were determined. These pel genes encoded pre-Pel proteins consisting of 377 to 380 amino acids (a.a.). A signal peptide consisting of 26 to 29 a.a. was present at the amino-terminus of each pre-Pel. Multiple sequence analysis revealed that Pel proteins of non-Erwinia phytopathogens including Xanthomonas, Pseudomonas, and Bacillus constituted a distinct cluster, which showed 20 to 43% a.a. identity to the four established Pel families of Erwinia. Homologous pel sequences were detected in various pathovars or strains of X. campestris. All of these xanthomonads produced an alkaline Pel and were capable of causing soft-rot in potato tuber slices and green pepper fruits.

UI MeSH Term Description Entries
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D010935 Plant Diseases Diseases of plants. Disease, Plant,Diseases, Plant,Plant Disease
D011133 Polysaccharide-Lyases A group of carbon-oxygen lyases. These enzymes catalyze the breakage of a carbon-oxygen bond in polysaccharides leading to an unsaturated product and the elimination of an alcohol. EC 4.2.2. Polysaccharide Lyase,Polysaccharide-Lyase,Lyase, Polysaccharide,Polysaccharide Lyases
D011549 Pseudomonas A genus of gram-negative, aerobic, rod-shaped bacteria widely distributed in nature. Some species are pathogenic for humans, animals, and plants. Chryseomonas,Pseudomona,Flavimonas
D004885 Erwinia A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria whose organisms are associated with plants as pathogens, saprophytes, or as constituents of the epiphytic flora.
D004926 Escherichia coli A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc. Alkalescens-Dispar Group,Bacillus coli,Bacterium coli,Bacterium coli commune,Diffusely Adherent Escherichia coli,E coli,EAggEC,Enteroaggregative Escherichia coli,Enterococcus coli,Diffusely Adherent E. coli,Enteroaggregative E. coli,Enteroinvasive E. coli,Enteroinvasive Escherichia coli
D005798 Genes, Bacterial The functional hereditary units of BACTERIA. Bacterial Gene,Bacterial Genes,Gene, Bacterial
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D001483 Base Sequence The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence. DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D013045 Species Specificity The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species. Species Specificities,Specificities, Species,Specificity, Species

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