6 nm x 3 nm (on membrane surface) oval shaped nanometer
||Bacteria Escherichia coli
||Abramson J, Smirnova I, Kasho V, Verner G, Kaback HR, Iwata S. Structure and mechanism of the lactose permease of Escherichia coli. Science. 2003 Aug 1 301(5633):610-5. p.611 left column top paragraphPubMed ID12893935
||crystal structure at 3.5 angstroms of the Escherichia coli lactose permease
||"Viewed parallel to the membrane, the monomer is heart-shaped with an internal cavity open on the cytoplasmic side and largest dimensions of 60 Å (along the membrane) by 60 Å (along the membrane normal). Normal to the membrane, the molecule is oval-shaped with dimensions of 30 Å by 60 Å. According to biochemical evidence (refs 10, 11), the membrane is estimated to be ~27 Å (fig.1A)"
||Ron Milo - Admin