Mutation of an alternative sigma factor in the cyanobacterium Nostoc punctiforme results in increased infection of its symbiotic plant partner, Anthoceros punctatus

• Published in: Journal of Bacteriology Vol. 180; no. 18; pp. 4938 - 4941
• Main Authors: Campbell, E.L. (University of California, Davis.), Brahamsha, B, Meeks, J.C
• Format: Journal Article
• Language: English
• Published: United States American Society for Microbiology 01-09-1998
• Series: Note
• Subjects: Amino Acid Sequence; AMINO ACID SEQUENCES; Anthoceros punctatus; ARN MENSAJERO; ARN MESSAGER; Bacteria; Bacteriology; BINDING PROTEINS; BRYOPHYTA; CHEMICAL COMPOSITION; COMPOSICION QUIMICA; COMPOSITION CHIMIQUE; CTPH GENE; Cyanobacteria - physiology; EXPRESION GENICA; EXPRESSION DES GENES; Flowers & plants; Freshwater; GENBANK/AF022822; GENBANK/AF022823; GENE; GENE EXPRESSION; GENES; GENETICA; GENETICS; GENETIQUE; Infections; MESSENGER RNA; Microbiology; MOLECULAR SEQUENCE DATA; MUTACION; MUTATION; NOSTOC; Nostoc punctiforme; NUCLEOTIDE SEQUENCE; Open Reading Frames; PATHOGENESE; PATHOGENESIS; PATOGENESIS; Phenotype; Plant Microbiology; Plants - microbiology; PROTEINAS AGLUTINANTES; PROTEINE DE LIAISON; RESTRICTION MAPPING; RNA POLYMERASE; SECUENCIA NUCLEOTIDICA; SEQUENCE NUCLEOTIDIQUE; SIGH GENE; Sigma Factor - chemistry; Sigma Factor - physiology; SIMBIOSIS; STRUCTURAL GENES; SYMBIOSE; SYMBIOSIS; TRANSCRIPCION; TRANSCRIPTION; Transcription, Genetic; TRANSFERASAS; TRANSFERASE; TRANSFERASES
• ISSN: 0021-9193; 1098-5530; 1067-8832
• DOI: 10.1128/jb.180.18.4938-4941.1998

An alternative group 2 sigma factor was identified in the nitrogen-fixing, symbiotically competent cyanobacterium Nostoc punctiforme and designated sigH. Transcription of sigH was specifically induced within 1.5 h following exposure of N. punctiforme to its symbiotic plant partner, Anthoceros punctatus. A mutation in sigH resulted in a sixfold-higher initial infection of A. punctatus tissue without a parallel increase in nitrogen-fixing activity