RESISTANCE TO NODULATION OF CV AFGHANISTAN PEAS IS OVERCOME BY NODX, WHICH MEDIATES AN O-ACETYLATION OF THE RHIZOBIUM-LEGUMINOSARUM LIPO-OLIGOSACCHARIDE NODULATION FACTOR

被引:126
作者
FIRMIN, JL
WILSON, KE
CARLSON, RW
DAVIES, AE
DOWNIE, JA
机构
[1] JOHN INNES CTR,JOHN INNES INST,COLNEY LANE,NORWICH NR4 7UH,ENGLAND
[2] UNIV GEORGIA,COMPLEX CARBOHYDRATE RES CTR,ATHENS,GA 30602
关键词
D O I
10.1111/j.1365-2958.1993.tb01961.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
Only some strains of Rhizobium leguminosarum biovar viciae can efficiently nodulate varieties of peas such as cv. Afghanistan, which carry a recessive allele that blocks efficient nodulation by most western isolates of R. I. viciae. One strain (TOM) which can nodulate cv. Afghanistan peas has a gene (nodX) that is required to overcome the nodulation resistance. Strain TOM makes significantly lower amounts of lipo-oligosaccharide nodulation factors than other strains of R. L viciae and this effect appears to be due to lower levels of nod gene induction. These nodulation factors are similar to those from other R. L viciae strains in that they consist of an oligomer of four or five beta1-4-linked N-acetylglucosamine residues in which the terminal non-reducing glucosamine carries an O-acetyl group and a C18:4 or C18:1 N-acyl group. However, one of the nodulation factors made by strain TOM differs from the factors made by other strains of R. I. viciae in that it carries an O-acetyl group on the C-6 of the reducing N-acetylglucosamine residue. This acetylation is NodX-dependent and the pentameric nodulation factor is acetylated on the reducing N-acetylglucosamine residue whereas the tetrameric nodulation factor is not. Although the nodL gene product is also an O-acetyl transferase (it O-acetylates the C-6 of the terminal non-reducing glucosamine), there is very little similarity between the amino acid sequences of these two acetyl transferases.
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页码:351 / 360
页数:10
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