A Meat-Derived Lactic Acid Bacteria, Lactobacillus plantarum IIA, Expresses a Functional Parvulin-Like Protein with Unique Structural Property

• Main Authors: Cahyo Budiman, Irma Isnafia Arief, Fernandes Opook, Muhammad Yusuf
• Format: Article
• Language: English; English
• Published: Science Publications 2021
• Subjects: QP501-801 Animal biochemistry
• Online Access: https://eprints.ums.edu.my/id/eprint/32951/1/A%20Meat-Derived%20Lactic%20Acid%20Bacteria%2C%20Lactobacillus%20plantarum%20IIA%2C%20Expresses%20a%20Functional%20Parvulin-Like%20Protein%20with%20Unique%20Structural%20Property.pdf; https://eprints.ums.edu.my/id/eprint/32951/2/A%20Meat-Derived%20Lactic%20Acid%20Bacteria%2C%20Lactobacillus%20plantarum%20IIA%2C%20Expresses%20a%20Functional%20Parvulin-Like%20Protein%20with%20Unique%20Structural%20Property1.pdf; https://eprints.ums.edu.my/id/eprint/32951/; https://thescipub.com/abstract/ojbsci.2021.120.135; https://doi.org/10.3844/ojbsci.2021.120.135
• Institution: Universiti Malaysia Sabah

The genome sequence of a Lactic Acid Bacterium (LAB) Lactobacillus plantarum IIA contains a single gene encoding a parvulin-like protein (Par-LpIIA). This protein belongs to Peptidyl Prolyl cis-trans Isomerase (PPIase) family proteins that catalyze a slow cis-trans isomerization of cis prolyl bond during protein folding. This study aims to provide molecular and biochemical evidences of the existence of Par-LpIIA in L. plantarum IIA and have an insight into its structural properties. The result showed that the gene encoding Par-LpIIA was successfully amplified using specific primers yielding a ~900 bp amplicon indicating that the gene indeed exists in its genomic DNA. BLAST analysis confirmed that the protein is a rotamase of parvulin-like protein. Further biochemical analysis demonstrated that cell lysate of L. plantarum IIA-1A5 exhibited remarkable PPIase activity towards peptide substrate and ability to accelerate the refolding of RNase T1, with the catalytic efficiency (kcat/KM) of 1.9 and 0.02 µM ˗¹ s ˗¹, respectively. A specific inhibitor clearly inhibited the PPIase activity for parvulin-like protein with IC50 of 230 nM confirming that the protein encoded by Par-LpIIA gene is a parvulin-like protein and expressed in an active form. Further, the three-dimensional model of Par-LpIIA showed that this protein consists of two domains of a homolog WW domain and PPIase domain with a unique active site configuration compared to human Pin1. Altogether, we then proposed the possible roles of this protein for L. plantarum IIA.