Phage T3 overcomes the BREX defense through SAM cleavage and inhibition of SAM synthesis by SAM lyase.

Andriianov A, Trigüis S, Drobiazko A, Sierro N, Ivanov NV, Selmer M, Severinov K, Isaev A, Cell Rep 42(8):112972 (2023) Europe PMC

SASDQ95 – The complex formed between E. coli S-adenosylmethionine synthase and wild-type S-adenosyl-L-methionine lyase from bacteriophage T3

S-adenosylmethionine synthase
S-adenosyl-L-methionine lyase
MWexperimental 239 kDa
MWexpected 239 kDa
VPorod 325 nm3
log I(s) 1.58×10-1 1.58×10-2 1.58×10-3 1.58×10-4
S-adenosylmethionine synthase S-adenosyl-L-methionine lyase small angle scattering data  s, nm-1
ln I(s)
S-adenosylmethionine synthase S-adenosyl-L-methionine lyase Guinier plot ln 1.59×10-1 Rg: 4.8 nm 0 (4.8 nm)-2 s2
(sRg)2I(s)/I(0)
S-adenosylmethionine synthase S-adenosyl-L-methionine lyase Kratky plot 1.104 0 3 sRg
Dmax: 17.5 nm

Data validation


Fits and models


log I(s)
 s, nm-1
S-adenosylmethionine synthase S-adenosyl-L-methionine lyase OTHER model

Synchrotron SAXS data from solutions of the complex formed between E. coli S-adenosylmethionine synthase and wild-type S-adenosyl-L-methionine lyase from bacteriophage T3 in 50 mM Tris-HCl, 300 mM NaCl, 5 mM β-mercaptoethanol, 2 % glycerol, pH 7.5 were collected on the B21 beam line at the Diamond Light Source (Didcot, UK) using a Eiger 4M detector at a sample-detector distance of 4.0 m and at a wavelength of λ = 0.09998 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). In-line size-exclusion chromatography (SEC) SAS was employed. The SEC parameters were as follows: A 50.00 μl sample at 4.9 mg/ml was injected at a 0.16 ml/min flow rate onto a Shodex KW403 column at 25°C. Nine successive 3 second frames were collected. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted.

Rg and MW calculated using SAXSMoW: http://saxs.ifsc.usp.br

S-adenosylmethionine synthase (MetK)
Mol. type   Protein
Organism   Escherichia coli (strain K12)
Olig. state   Tetramer
Mon. MW   42.0 kDa
 
UniProt   P0A817 (1-384)
Sequence   FASTA
 
S-adenosyl-L-methionine lyase (T3 SAMase)
Mol. type   Protein
Organism   Enterobacteria phage T3
Olig. state   Tetramer
Mon. MW   17.8 kDa
 
UniProt   P07693 (1-152)
Sequence   FASTA