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Article

Specific role of the cyanobacterial PipX factor in the heterocysts of Anabaena sp. strain PCC 7120.

Journal of bacteriology - 1 Mar 2011

Valladares Ana, Rodríguez Virginia, Camargo Sergio, Martínez-Noël Giselle M A, Herrero Antonia, Luque Ignacio

Abstract excerpt

The PipX factor is a regulatory protein that seems to occur only in cyanobacteria. In the filamentous, heterocyst-forming Anabaena sp. strain PCC 7120, open reading frame (ORF) asr0485, identified as the pipX gene, is expressed mainly under conditions of combined-nitrogen deprivation dependent on the global N regulator NtcA and the heterocyst-specific regulator HetR. Primer extension and 5' rapid amplification of...

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Identifiers

PMID: 21193608
DOI: 10.1128/JB.01202-10
PMCID: PMC3067599

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PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-07.1.

Source receipt: pubmed, retrieved 7 Sept 2026.

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Specific role of the cyanobacterial PipX factor in the heterocysts of Anabaena sp. strain PCC 7120.PMID 21193608Read ↗

PipX, the coactivator of NtcA, is a global regulator in cyanobacteria.Semantic proximity Read ↗

Functional Overlap of hetP and hetZ in Regulation of Heterocyst Differentiation in Anabaena sp. Strain PCC 7120.Semantic proximity Read ↗

Heterocyst-specific expression of patB, a gene required for nitrogen fixation in Anabaena sp. strain PCC 7120.Semantic proximity Read ↗

ppGpp metabolism is involved in heterocyst development in the cyanobacterium Anabaena sp. strain PCC 7120.Semantic proximity Read ↗

Mutual regulation of ntcA and hetR during heterocyst differentiation requires two similar PP2C-type protein phosphatases, PrpJ1 and PrpJ2, in Anabaena sp. strain PCC 7120.Semantic proximity Read ↗

Interaction network in cyanobacterial nitrogen regulation: PipX, a protein that interacts in a 2-oxoglutarate dependent manner with PII and NtcA.Semantic proximity Read ↗

Role of two NtcA-binding sites in the complex ntcA gene promoter of the heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120.Semantic proximity Read ↗

NtcA-regulated heterocyst differentiation genes hetC and devB from Anabaena sp. strain PCC 7120 exhibit a similar tandem promoter arrangement.Semantic proximity Read ↗

Requirement of the regulatory protein NtcA for the expression of nitrogen assimilation and heterocyst development genes in the cyanobacterium Anabaena sp. PCC 7120.Semantic proximity Read ↗

PatS and products of nitrogen fixation control heterocyst pattern.Semantic proximity Read ↗

Activation of the Anabaena nir operon promoter requires both NtcA (CAP family) and NtcB (LysR family) transcription factors.Semantic proximity Read ↗

A gene cluster that regulates both heterocyst differentiation and pattern formation in Anabaena sp. strain PCC 7120.Semantic proximity Read ↗

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