The entire molecule has a net neutral charge and is a zwitterion, with the exception of amino acids with basic or acidic side chains.
ðɪ ɛntˈaɪɚ mˈɑːlɪkjˌuːl hɐz ɐ nˈɛt nˈuːtɹəl tʃˈɑːɹdʒ ænd ɪz ɐ zwɪtˈɪɹiən, wɪððɪ ɛksˈɛpʃən ʌv ɐmˈiːnoʊ ˈæsɪdz wɪð bˈeɪsɪk ɔːɹ ɐsˈɪdɪk sˈaɪd tʃˈeɪnz.