2006 Fiscal Year Final Research Report Summary
Diversity of the structures and functions of Streptomyces linear genomes
| Project/Area Number |
16208010
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied microbiology
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| Research Institution | Hiroshima University |
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Principal Investigator |
KINASHI Haruyasu Hiroshima University, Graduate School of Advanced Sciences of Matter, Professor, 大学院先端物質科学研究科, 教授 (80224997)
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| Co-Investigator(Kenkyū-buntansha) |
ARAKAWA Kenji Hiroshima University, Graduate School of Advanced Sciences of Matter, Assistant, 大学院先端物質科学研究科, 助手 (80346527)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Streptomyces / linear plasmid / transposon / chromosome inversion / y-butyrolactone / P450 / regulatory cascade / polyketide biosynthesis |
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| Research Abstract |
(1) We revealed that the chromosomal inversion found in Streptomycesgriseus 402-2 occurred by transposition of a transposonfollowedbyhomologousrecombinationbetweenthe old and new transposons.Consequently, we identified chimeric direct repeat sequences at both ends of the two transposons in strain 402-2.
(2) We revealed that a series of linear plasmids in S. violaceoruber JCM4979 were formed by amplification of a 36-kb DNA unit comprising of SCP1 and SCP2 fragments in SCP1. It is quite interesting that these linear plasmids are compatible in spite of their identical oriC sequence.
(3) The structure of LC-KA05 produced by an amine oxidasemutantof S. rochefindicated that oxidation of an amide intermediate to an imide followed by nucleophilic attack by C2 formed the unique 17-membered ring of lankacidin. Heterologous expression of the Ikc cluster in S. lividans and the lkcFG gene fusion experiment supported our modular-iterative polyketide biosynthesis hypothesis for lankacidin.
(4) Feeding and gene targeting experiments revealed that isoleucine was oxidized to 2-methylbutyrate and incorporated into the 8,15-didexylankanolide skeleton, and then hydroxylated at the 15 and 8 positions by LkmK and LkmF, respectively.
(5) We revealed that srrX-srrA make a y-butyrolactone-receptor system in S. rochei. The srrX gene showed a positive effect on antibiotic production and a negative effect on spore formation, while, srrA reversed both effects of srrX. Extensive transcriptional analysis confirmed the signaling pathway from srrX through srrA to srrY. We also identified two SrrA binding sites upstream of the srrY gene, which contained a palindromic sequence for GB-receptors and repeat sequences for SARP proteins, respectively.
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Research Products
(19 results)
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[Journal Article] Streptomyces linear plasmids : their discovery, functions, interactions with other replicons, and evolutionary significance.2007
Author(s)
Chater K.F., Kinashi H.
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Journal Title
Microbiology Monographs, Microbial Linear Plasmids, ed. by Meinhardt, F., and Klassen, R., Springer, Berlin/Heidelberg (in press)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] SCP1, a 356,023 bp linear plasmid adapted to the ecology and developmental biology of its host, Streptomyces coelicolor A3(2).2004
Author(s)
S.D.Bentley, S.Brown, L.D.Murphy, D.E.Harris, M.A.Quail, J.Parkhill, B.G.Barrell, J.R.McCormick, R.I.Santamaria, R.Losick, M.Yamasaki, H.Kinashi, C.W.Chen, G.Chandra, D.Jakimowicz, H.M.Kieser, T.Kieser, K.F.Chater
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Journal Title
Mol. Microbiol. 51
Pages: 1615-1628
Description
「研究成果報告書概要(欧文)」より
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