Latif, SaraGottschamel, JohannaSyed, TahiraSameeullah, MuhammadYounus, IqraGull, Kehkshan2023-07-202023-07-202022Latif, S., Gottschamel, J., Syed, T., Younus, I., Gull, K., Sameeullah, M., ... & Waheed, M. T. (2022). Inducible expression of human papillomavirus‐16 L1 capsomeres in the plastomes of Nicotiana tabacum: Transplastomic plants develop normal flowers and pollen. Biotechnology and applied biochemistry, 69(2), 596-611.0885-45131470-8744http://dx.doi.org/10.1002/bab.2136https://hdl.handle.net/20.500.12491/11318Human papillomavirus type-16 (HPV-16) is the major HPV type involved in causing cervical cancer among women. The disease burden is high in developing and underdeveloped countries. Previously, the constitutive expression of HPV-16 L1 protein led to male sterility in transplastomic tobacco plants. Here, the HPV-16 L1 gene was expressed in chloroplasts of Nicotiana tabacum under the control of an ethanol-inducible promoter, trans-activated by nucleus-derived signal peptide. Plants containing nuclear component were transformed with transformation vector pEXP-T7-L1 by biolistic gun. The transformation and homoplasmic status of transformed plants was verified by polymerase chain reaction and Southern blotting, respectively. Protein was induced by spraying 5% ethanol for 7 consecutive days. The correct folding of L1 protein was confirmed by antigen-capture ELISA using a conformation-specific antibody. The L1 protein accumulated up to 3 mu g/g of fresh plant material. The L1 protein was further purified using affinity chromatography. All transplastomic plants developed normal flowers and produced viable seeds upon self-pollination. Pollens also showed completely normal structure under light microscope and scanning electron microscopy. These data confirm the use of the inducible expression as plant-safe approach for expressing transgenes in plants, especially those genes that cause detrimental effects on plant growth and morphology.eninfo:eu-repo/semantics/closedAccessBiopharmaceuticalsCapsomeresCervical CancerPlastid TransgenesCancer IncidenceTobaccoArticle10.1002/bab.2136692596611336507092-s2.0-85102751449Q3WOS:000630599400001Q3