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Oceanic photosynthesis is directly affected by cyanophage NblA proteins - whole cell proteome changes

ABSTRACT: Marine picocyanobacteria are abundant and globally significant photosynthetic organisms that coexist in the ocean with cyanophages, viruses that infect cyanobacteria. Cyanophages carry auxiliary metabolic genes acquired from their hosts, which are thought to reprogram host metabolism to benefit the phage. One such gene is nblA, found across multiple cyanophage families. In cyanobacteria, nblA is responsible for triggering the proteolytic degradation of the phycobilisome—the large light-harvesting complex essential for photosynthesis—under nutrient deprivation. In this study, we characterized the proteomic changes in Synechococcus sp. strain WH8109 following infection with wild-type cyanophage S-TIP37, a T7-like phage isolated from the Red Sea, and compared these changes to those observed with an S-TIP37 mutant lacking the nblA gene.

INSTRUMENT(S):

ORGANISM(S): Synechococcus Sp. Wh 8109

SUBMITTER: Oded Kleifeld

LAB HEAD: Oded Kleifeld

PROVIDER: PXD057452 | Pride | 2025-10-06

REPOSITORIES: Pride

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Dataset's files

Source:

			Action	DRS
	2025-02-23-decoys-contam-WH8109_UP000002780_S-TIP37_UP00255828_mod.fasta.fas	Fasta
	File_Descriptions.txt	Txt
	MF6_ModDb_LFQ-MBR-Plus_Infection.zip	Other
	MF8-LFQ-ModDB_MBR_plus_OverExpression.zip	Other
	Seq84740_88min_480Ex1.raw	Raw

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Project description:Cyanobacteria are highly abundant in the oceans where they are constantly exposed to lytic viruses. Some viruses are restricted to a narrow host range while others infect a broad range of hosts. It is currently unknown whether broad-host range phages employ the same infection program, or regulate their program in a host-specific manner to accommodate for the different genetic makeup and defense systems of each host. Here we used a combination of microarray and RNA-seq analyses to investigate the interaction of three phylogentically distinct Synechococcus strains, WH7803, WH8102, and WH8109, with the broad-host range T4-like myovirus, Syn9, during infection. Strikingly, we found that the phage led a nearly identical expression program in the three hosts despite considerable differences in host gene content. On the other hand, host responses to infection involved mainly host-specific genes, suggesting variable attempts at defense against infection. A large number of responsive host genes were located in hypervariable genomic islands, substantiating genomic islands as a major axis of phage-bacteria interactions in cyanobacteria. Furthermore, transcriptome analyses and experimental determination of the complete phage promoter map revealed three temporally regulated modules and not two as previously thought for cyanophages. In contrast to T4, an extensive, previously unknown regulatory motif drives expression of early genes and host-like promoters drive middle-gene expression. These promoters are highly conserved among cyanophages and host-like middle promoters extend to other T4-like phages, indicating that the well-known mode of regulation in T4 is not the rule among the broad family of T4-like phages. We investigated the infection process and transcriptional program of the P-TIM40 cyanophage during infection of a Prochlorococcus NATL2A host. The results are discussed in conjunction with results obtained from the infection process for the Syn9 cyanophage in three different Synechococcus hosts: WH7803 (Dufresne et al. 2008), WH8102 (Palenik et al. 2003) and WH8109 (sequenced as part of this study).

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Oceanic photosynthesis is directly affected by cyanophage NblA proteins - whole cell proteome changes

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