it was recently found ( tsai , s.-c. , noda , m. , adamik , r. , moss , j. , and vaughan , m. ( 1987 ) proc . natl . acad . sci . u. s. a . 84 , 5139-5142 ) that a bovine brain membrane protein known as adp-ribosylation factor or arf , which enhances adp-ribosylation of gs alpha , also increases the gtp-dependent nad : arginine and nad : protein adp-ribosyltransferase , nad glycohydrolase , and auto-adp-ribosylation activities of choleragen .
C0025252
membrane protein
C0033684
protein