Identification and Comparison of Hyaluronic Acid Biosynthetic Genes from Different Capsular Types of Pasteurella Multocida

Abstract

BackgroundPasteurella multocida produces a capsule composed of different polysaccharides according to the capsular serotype (A, B, D, E, and F). Hyaluronic acid (HA) is a component of certain capsular types of this bacterium, especially capsular type A. Previously, two HA biosynthetic genes from a capsular type A strain were studied for the industrial-scale improvement of HA production. Molecular comparison of these genes across different capsular serotypes of P. multocida has not been reported. This study aimed to compare nine HA biosynthetic genes (glck, pgi, pgm, galU, hyaC, glmS, glmM, glmU, and hyaD) of eleven P. multocida strains (A:B:D:F = 8:1:1:1) with those of other organisms using sequence and structural bioinformatics analyses.ResultsThese nine genes showed a high level of within-species similarity (98–99%) compared to other organisms. Only the last gene of two strains with capsular type A:3 (PM70 and CRIMBP-0884) and one capsular type F strain (HN07) significantly differed from those of other strains (82%). Analysis of amino acid patterns together with phylogenetic results showed that the HA biosynthetic genes of the type A and D strains were closely related compared to those of the type B and F strains. However, the genes in the capsular type F strain were notably similar to those of the capsular type A:3 strain. Protein structural analysis supported structural similarities of the encoded enzymes between the strains of capsular types A, B, D, and F, except for the Glck, Pgm, GlmU and HyaD proteins.ConclusionOur bioinformatics analyses proposed that variations observed within these genes could be useful for genetic engineering-based improvement of hyaluronic acid production.