Characterization of CDNA for Nodulin-75 of Soybean: A Gene Product Involved in Early Stages of Root Nodule Development

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1987 Jul 1

PMID 16593857

Citations 64

Authors

H J Franssen

J P Nap

T Gloudemans

W Stiekema

H Van Dam

F Govers

J Louwerse

A van Kammen

T Bisseling

Affiliations

Soon will be listed here.

Abstract

Establishment of a nitrogen-fixing root nodule is accompanied by a developmentally regulated expression of nodulin genes, only some of which, the so-called early nodulin genes, are expressed in stages preceding actual nitrogen fixation. We have isolated soybean cDNA clones representing early nodulin genes and have studied clone pENOD2 in detail. The cDNA insert of this clone hybridizes to nodule-specific RNA of 1200 nucleotides in length. The RNA that was hybrid-selected by the cloned ENOD2 DNA was in vitro translated to produce two nodulins with an apparent M(r) of 75,000, the N-75 nodulins. These two nodulins differ slightly in charge and one does not contain methionine. The amino acid sequence deduced from the DNA sequence shows that proline accounts for 45% of the 240 residues in these nodulins and the sequence contains at least 20 repeating heptapeptide units. The amino acid composition of none of the (hydroxy)proline-rich (glyco)proteins described in plants resembles the composition of the N-75 nodulins, especially with respect to the high glutamic acid and the low serine content. This suggests that the N-75 nodulins belong to a hitherto unidentified class of presumably structural proteins. The genes encoding the N-75 nodulins were found to be expressed in nodule-like structures devoid of intracellular bacteria and infection threads, indicating that these nodulins do not function in the infection process but more likely function in nodule morphogenesis.

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