title: The telomere system of the Streptomyces linear plasmid SCP1 represents a novel class.
abstract: Linear plasmids and chromosomes of Streptomyces carry terminal proteins (TPs) covalently attached to the 5' ends of the DNA. Most known telomeres are conserved in primary sequence and in the potential secondary structures formed during replication. The TP that caps these telomeres is also highly conserved and its coding gene, tpg, is present in all Streptomyces chromosomes and some linear plasmids. Linear plasmid SCP1 contains atypical telomere sequences and no tpg homologue, and can replicate in the absence of tpg, suggesting that it carries a novel TP gene. To isolate the TP on the SCP1 telomeres, we constructed a multicopy mini-SCP1 plasmid. The TP capping the plasmid was isolated and subjected to tryptic digestion and mass spectrometric analysis, and the results indicated that the TP was encoded by an open reading frame (ORF), SCP1.127 (tpc), on SCP1. Of the two ORFs upstream of tpc, SCP1.125 (tac) but not SCP1.126 was essential for replication of mini-SCP1. The Tac-Tpc system of SCP1 represents a convergently evolved novel telomere-capping system of Streptomyces linear replicons.
authors: Institute of Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan.
authors: Chih-Hung
authors: CH
authors: Huang
authors: Hsiu-Hui
authors: HH
authors: Tsai
authors: Yeou-Guang
authors: YG
authors: Tsay
authors: Yu-Nien
authors: YN
authors: Chien
authors: Shan-Li
authors: SL
authors: Wang
authors: Ming-Yuan
authors: MY
authors: Cheng
authors: Chia-Hui
authors: CH
authors: Ke
authors: Carton W
authors: CW
authors: Chen
mesh_terms: D004269:DNA, Bacterial / Q000032:analysis; D005798:Genes, Bacterial; D010957:Plasmids / Q000235:genetics*; D013302:Streptomyces / Q000235:genetics*; D016615:Telomere / Q000235:genetics*; D034501:Telomere-Binding Proteins / Q000096:biosynthesis* / Q000378:metabolism; D020798:Two-Hybrid System Techniques
chemical_list: D004269:DNA, Bacterial; D034501:Telomere-Binding Proteins