Found this:
https://meatsci.osu.edu/node/130
"A 7 percent brine solution is ideal for solubilization of myosin. Using meat which contains 65 percent moisture, one would want 4.5 percent salt in contact with the meat for maximum extraction of proteins. This can be accomplished during chopping by adding the salt initially with the meat but with no additional water. This extraction is also enhanced by using ice instead of water to reduce the emulsion temperature to 28 to 30F. Once these proteins are extracted, they remain soluble with the addition of water."
https://meatsci.osu.edu/node/130
"A 7 percent brine solution is ideal for solubilization of myosin. Using meat which contains 65 percent moisture, one would want 4.5 percent salt in contact with the meat for maximum extraction of proteins. This can be accomplished during chopping by adding the salt initially with the meat but with no additional water. This extraction is also enhanced by using ice instead of water to reduce the emulsion temperature to 28 to 30F. Once these proteins are extracted, they remain soluble with the addition of water."