TABLE 1.

Size, charge, and working concentration of the thiol-reactive reagents used in this study

Reagents are listed in order of net charge, increasing size.

Chemical name	Abbreviation	Net charge	Molecular weight	Working concentration	Stock concentration
			g/mol	mm
2-Aminoethyl methanethiosulfonate hydrobromide	MTSEA	+	236	2.5	100×
[2-(Trimethylammonium)ethyl] methanethiosulfonate bromide	MTSET	+	278	1	100×
3-(Triethylammonium)propyl Methanethiosulfonate bromide	MTS-PTrEA	+	334	1	100×
2-((Biotinoyl)amino)ethyl methanethiosulfonate	MTSEA-biotin	Neutral	382	1	5×
2-Sulfonatoethyl methanethiosulfonate	MTSES	−	219	5	100×