MOLECULAR ANALYSIS OF THE AMS OPERON REQUIRED FOR EXOPOLYSACCHARIDE SYNTHESIS OF ERWINIA-AMYLOVORA

被引:216
作者
BUGERT, P [1 ]
GEIDER, K [1 ]
机构
[1] MAX PLANCK INST MED RES,D-69120 HEIDELBERG,GERMANY
关键词
D O I
10.1111/j.1365-2958.1995.tb02361.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A 16 kb transcript of the ams region, which is essential for biosynthesis of amylovoran, the acidic exopolysaccharide of Erwinia amylovora, was detected by Northern hybridization analysis. The positive regulator RcsA enhanced transcription of the large mRNA from the ams operon, The nucleotide sequence of this area revealed 12 open reading frames (ORFs), which are all transcribed in the same direction. Five ORFs corresponded to the previously mapped genes amsA to amsE. Sequence analysis of the insertion sites of several Tn5 mutations confirmed these data. Tn5 or site-directed mutagenesis of the ORFs 477, 377, 144, and 743 revealed an amylovoran-deficient phenotype, and the newly identified genes were named amsG, amsH, amsI and amsF, respectively. The predicted amino acid sequence of AmsG is highly homologous to galactosyl-1-phosphate undecaprenyl-phosphate transferases. AmsB and AmsD are similar to other glycosyl transferases, and AmsH may be related to BexD, A significant homology to mammalian phosphatases was observed for Amsl, AmsA shows characteristic motifs for membrane association and ATP binding, AmsF carries a secretory signal sequence in the N-terminus and could be involved in periplasmic processing of the repeating units. Complementation experiments located a promoter region required for gene expression as far as 500 bp upstream of amsG, It is preceded by a typical transcriptional termination sequence. A mutation upstream of the terminator did not affect amylovoran synthesis. Partial nucleotide sequences further upstream of the ams region showed homology to genes mapped at 45 min on the Escherichia coli chromosome. A termination sequence was also found downstream of the ams operon at a distance of 18 kb from the promoter. Between amsF and this terminator, three additional ORFs were detected.
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页码:917 / 933
页数:17
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共 79 条
  • [1] IDENTIFICATION OF THE EXO LOCI REQUIRED FOR EXOPOLYSACCHARIDE SYNTHESIS IN AGROBACTERIUM-RADIOBACTER NCIB 11883
    AIRD, ELH
    BRIGHTWELL, G
    JONES, MA
    JOHNSTON, AWB
    [J]. JOURNAL OF GENERAL MICROBIOLOGY, 1991, 137 : 2287 - 2297
  • [2] ALLEN P, 1987, J GEN MICROBIOL, V133, P331
  • [3] BIOSYNTHESIS OF KLEBSIELLA K2 CAPSULAR POLYSACCHARIDE IN ESCHERICHIA-COLI HB101 REQUIRES THE FUNCTIONS OF RMPA AND THE CHROMOSOMAL CPS GENE-CLUSTER OF THE VIRULENT-STRAIN KLEBSIELLA-PNEUMONIAE CHEDID (O1 K2)
    ARAKAWA, Y
    OHTA, M
    WACHAROTAYANKUN, R
    MORI, M
    KIDO, N
    ITO, H
    KOMATSU, T
    SUGIYAMA, T
    KATO, N
    [J]. INFECTION AND IMMUNITY, 1991, 59 (06) : 2043 - 2050
  • [4] EXTRACELLULAR POLYSACCHARIDE OF ERWINIA-AMYLOVORA - CORRELATION WITH VIRULENCE
    AYERS, AR
    AYERS, SB
    GOODMAN, RN
    [J]. APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1979, 38 (04) : 659 - 666
  • [5] CLONING OF A LARGE GENE-CLUSTER INVOLVED IN ERWINIA-AMYLOVORA CFBP1430 VIRULENCE
    BARNY, MA
    GUINEBRETIERE, MH
    MARCAIS, B
    COISSAC, E
    PAULIN, JP
    LAURENT, J
    [J]. MOLECULAR MICROBIOLOGY, 1990, 4 (05) : 777 - 786
  • [6] REPEAT UNIT POLYSACCHARIDES OF BACTERIA - A MODEL FOR POLYMERIZATION RESEMBLING THAT OF RIBOSOMES AND FATTY-ACID SYNTHETASE, WITH A NOVEL MECHANISM FOR DETERMINING CHAIN-LENGTH
    BASTIN, DA
    STEVENSON, G
    BROWN, PK
    HAASE, A
    REEVES, PR
    [J]. MOLECULAR MICROBIOLOGY, 1993, 7 (05) : 725 - 734
  • [7] FURTHER CHARACTERIZATION OF AN HRP GENE-CLUSTER OF ERWINIA-AMYLOVORA
    BAUER, DW
    BEER, SV
    [J]. MOLECULAR PLANT-MICROBE INTERACTIONS, 1991, 4 (05) : 493 - 499
  • [8] IDENTIFICATION AND ANALYSIS OF THE RHIZOBIUM-MELILOTI EXOAMONP GENES INVOLVED IN EXOPOLYSACCHARIDE BIOSYNTHESIS AND MAPPING OF PROMOTERS LOCATED ON THE EXOHKLAMONP FRAGMENT
    BECKER, A
    KLEICKMANN, A
    KELLER, M
    ARNOLD, W
    PUHLER, A
    [J]. MOLECULAR & GENERAL GENETICS, 1993, 241 (3-4): : 367 - 379
  • [9] VISUALIZATION OF CAPSULE FORMATION BY ERWINIA-AMYLOVORA AND ASSAYS TO DETERMINE AMYLOVORAN SYNTHESIS
    BELLEMANN, P
    BERESWILL, S
    BERGER, S
    GEIDER, K
    [J]. INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, 1994, 16 (06) : 290 - 296
  • [10] LOCALIZATION OF TRANSPOSON INSERTIONS IN PATHOGENICITY MUTANTS OF ERWINIA-AMYLOVORA AND THEIR BIOCHEMICAL-CHARACTERIZATION
    BELLEMANN, P
    GEIDER, K
    [J]. JOURNAL OF GENERAL MICROBIOLOGY, 1992, 138 : 931 - 940