A novel actinobacterium NJES-13^T was isolated from the gut of Antarctic emperor penguin Aptenodytes forsteri. The new isolate produces bioactive gephyromycin metabolites and exopolysaccharides (EPS). Cells were Gram-negative, motile with the peritrichous flagella, and with a faint layer of extracellular slime. Colonies were yellow when grown on marine agar, ISP1, 2, 4 and TSA media. The strain developed clusters of coccoid, and divided by binary fission in the early phase of growth. The cell clusters were gradually disrupted during the stationary phase and formed short rod-shape cells which were interconnected by viscous EPS showing a three-dimensional net-like morphology, and contained polyhydroxyalkanoates (PHA) granules inside the cells. Growth of strain NJES-13^T was observed at 15–45 °C, at pH 6.0–9.0 with 0.5–9.0% (w/v) NaCl. The complete genomic size of strain NJES-13^T was 3.45 Mb with a DNA G + C content of 67.0 mol%. The combined polyphasic taxonomic characterizations presented in this study unequivocally separated strain NJES-13^T from all known genera in the family Dermatophilaceae. Thus, strain NJES-13^T represents a novel species of a new genus, for which the name Gephyromycinifex aptenodytis gen. nov., and sp. nov. is proposed. The type strain is NJES-13^T (= CCTCC 2019007^T = KCTC 49281^T). Genetic prediction of secondary metabolite biosynthesis revealed a 44.5 kb-long biosynthetic gene cluster (BGC) of type III polyketide synthase (PKS) as well as four other BGCs, indicating its great potential to produce novel bioactive metabolites derived from the gut microbiota of animals living in the extreme habitats in the Antarctica.

一种新颖的actinobacterium NJES-13 ^Ť从南极帝企鹅的肠中分离学名：Aptenodytes forsteri。新的分离物产生具有生物活性的 gephyromycin 代谢物和胞外多糖 (EPS)。细胞是革兰氏阴性的，具有周毛鞭毛和微弱的细胞外粘液层。当在海洋琼脂、ISP1、2、4 和 TSA 培养基上生长时，菌落呈黄色。该菌株发育成球状簇，并在生长早期通过二元裂变分裂。细胞团在静止期逐渐被破坏，形成短棒状细胞，由粘性EPS相互连接，呈三维网状形态，细胞内含有聚羟基链烷酸酯（PHA）颗粒。菌株 NJES-13 ^{T 的}生长在 15–45 °C、pH 6.0–9.0 和 0.5–9.0% (w/v) NaCl 下观察到。菌株 NJES-13 ^T的完整基因组大小为 3.45 Mb，DNA G + C 含量为 67.0 mol%。本研究中提出的组合多相分类学特征明确地将 NJES-13 ^T菌株与嗜皮菌科的所有已知属分开。因此，菌株 NJES-13 ^T代表了一个新属的新物种，其名称为Gephyromycinifex aptenodytis gen。十一月，和 sp。十一月 被提议。类型菌株是 NJES-13 ^T (= CCTCC 2019007 ^T  = KCTC 49281 ^T）。次级代谢物生物合成的遗传预测揭示了一个 44.5 kb 长的 III 型聚酮化合物合酶 (PKS) 生物合成基因簇 (BGC) 以及其他四种 BGC，表明其在产生源自动物肠道微生物群的新型生物活性代谢物方面具有巨大潜力在南极洲的极端栖息地。