Table II. Masses of the phage TP901–1 baseplate and subcomponents. All the masses reported in this table are expressed in Da. N.D., not determined. Numbers underlined indicate masses determined using the method reported in McKay et al., J. Am. Chem. Soc. 2006, 128, 11433–11442.

TP901–1
Tripod
Protein	BppU	BppL	BppL Trimer	BppU Trimer	BppU Trimer + BppL Trimer	BppU Trimer + 2xBppL Trimer	Tripod
Observed Mass/Da	33,972	17,934 (17,840)	53,802 (53,522)	101,918	155,470	209,764	264,088
Calculated Mass/Da	33,969	17,970a (17,839)	53,910a (53,517)	101,907	155,817a (155,424)	209,727a (208,941)	263,637b (262,458)
TP1
Protein	Dit	BppU	BppL	BppL Trimer	2× BppL Trimer	3× BppL Trimer	Tripod	Baseplate
Observed Mass/Da	29,053b	33,843	18,216	54,646	109,290	164,001	265,995	1,769,204
Calculated Mass/Da	29,051	33,841	18,214	54,643	109,286	163,929	265,449	1,767,016
Dit-BppU
Protein	Dit	BppU	BppU Trimer	Dit x 6	Dit x 12	6xDit + 6xBppU-Trimers	12xDit + 6xBppU-Trimers
Observed Mass/Da	29,197	33,855	101,584	175,173	350,348	784,979	959,852
Calculated Mass/Da	29,051	33,841	101,524	175,184	350,369	784,571	959,755
Tal-N (ORF47 residues 1 to 386)	Tal-N monomer	Tal-N dimer	Tal-N trimer
Observed Mass/Da	47,425	94,852	142,623
Calculated Mass/Da	47,523	95,046	142,569

^a With (without) ORF48 N-terminal Met.

^b Observed in native experiment.