Dataset Information

Mycoplasma pneumoniae processes functionally diverse proteins (N-Terminiome & Surfaceome)

ABSTRACT: Mycoplasma pneumoniae is a significant cause of pneumonia, particularly in children, the elderly and the immunocompromised, and post infection sequelae affecting organ sites distant to the respiratory tract are common. It is also a model pathogen where extensive ‘omics’ studies have been conducted to gain insight into how minimal genome self-replicating organisms function. Here we conducted an N-terminome study to determine which proteins are targets of processing events in M. pneumoniae. We identified 6,973 unique N-terminal peptides that mapped to 391 (56%) predicted M. pneumoniae proteins. True N-terminal sequences beginning with the initiating methionine (iMet) residue from the predicted Open Reading Frame (ORF) were identified for 163 proteins. Nearly half (317; 46%) of the ORFS derived from M. pneumoniae strain M129 are post-translationally modified, presumably by proteolytic processing, because dimethyl labelled neo-N-termini were characterised that mapped beyond the predicted N-terminus. An analysis of the N-terminome describes endoproteolytic processing events which predominately target negatively charged residues in P1′ (D and E) with lysine or serine/alanine in P2′ and P3′ positions. Surfaceome studies identified 160 proteins (23% of the proteome) to be exposed on the extracellular surface of M. pneumoniae. The two orthogonal methodologies used to characterise the surfaceome each identified the same 116 proteins, a 72% (116/160) overlap. Apart from lipoproteins, transporters, and adhesins, 93/160 (58%) of the surface proteins lack signal peptides and have well characterised, canonical functions in the cell. Mycoplasma pneumoniae culture conditions The M. pneumoniae (strain M129) cells were cultured in modified Hayflick’s medium at 37 °C in tissue culture flasks using established culture conditions63. Modified Hayflick’s medium contained 21 g PPLO broth base without crystal violet, 5 g of D-glucose, 4 mL of 0.5% phenol red, 100 mL of liquid yeast extract (150 g/L), 200 mL heat-inactivated horse serum (56 °C, 30 min) supplemented with 1 g ampicillin (Sigma, A5354, St. Louis, MO, USA) per litre. M. pneumoniae cells were harvested at mid-log phase by washing adherant cells 3 times with PBS and collected using cell scaping.

INSTRUMENT(S): TripleTOF 5600, Q Exactive Plus, QSTAR

ORGANISM(S): Mycoplasma Pneumoniae (strain Atcc 29342 / M129) Mycoplasma Pneumoniae

SUBMITTER: Joel Steele

LAB HEAD: Professor Steven Djordjevic

PROVIDER: PXD022356 | Pride | 2021-05-01

REPOSITORIES: Pride

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Protein cleavage influences surface protein presentation in Mycoplasma pneumoniae.

Berry Iain J IJ Widjaja Michael M Jarocki Veronica M VM Steele Joel R JR Padula Matthew P MP Djordjevic Steven P SP

Scientific reports 20210324 1

Mycoplasma pneumoniae is a significant cause of pneumonia and post infection sequelae affecting organ sites distant to the respiratory tract are common. It is also a model organism where extensive 'omics' studies have been conducted to gain insight into how minimal genome self-replicating organisms function. An N-terminome study undertaken here identified 4898 unique N-terminal peptides that mapped to 391 (56%) predicted M. pneumoniae proteins. True N-terminal sequences beginning with the initia ...[more]

PMID: 33762641

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			Action	DRS
	100.mgf	Mgf
	100.wiff	Wiff
	100.wiff.scan	Wiff
	101.mgf	Mgf
	101.wiff	Wiff