# Complete genome sequence of Paenibacillus polymyxa 19197, an endophytic bacterium isolated from the morel mushroom Morchella importuna

**Authors:** Changmeng Wu, Linsong He, Yingli Cai, Zhilan Xia, Fuqiang Yu, Xunyan He, Wei Liu

PMC · DOI: 10.1128/mra.01171-25 · 2026-02-24

## TL;DR

This paper presents the full genome sequence of Paenibacillus polymyxa 19197, a bacterium found in morel mushrooms, highlighting its potential roles in breaking down polysaccharides and fixing nitrogen.

## Contribution

The novelty lies in sequencing the complete genome of this endophytic bacterium and identifying its CAZymes and nitrogenase operon.

## Key findings

- The genome contains 220 glycoside hydrolases, indicating a strong capacity for polysaccharide degradation.
- A complete nitrogenase operon was identified, suggesting the bacterium's role in nitrogen fixation.

## Abstract

We report the complete genome sequence of Paenibacillus polymyxa 19197, an endophyte isolated from Morchella importuna. The 6.93 Mb circular chromosome encodes a diverse array of carbohydrate-active enzymes (CAZymes), including 220 glycoside hydrolases, and a complete nitrogenase operon, suggesting roles in polysaccharide degradation and nitrogen fixation within the morel ecosystem

## Linked entities

- **Species:** Morchella importuna (taxon 1174673)

## Full-text entities

- **Chemicals:** carbohydrate (MESH:D002241), polysaccharide (MESH:D011134), nitrogen (MESH:D009584)
- **Species:** Morchella importuna (species) [taxon 1174673]

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Source: https://tomesphere.com/paper/PMC12981129