metaprotein

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various organic compounds that result from a reaction between an acid or alkali and a protein and are soluble in weak acids or alkalis and insoluble in neutral solutions.

from The Century Dictionary.

• noun A protein derivative which results from the action of acids or alkalies upon albumins. The group includes the acid albumins and alkaline albuminates.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry Any protein derived from another by the use of acids or bases