Variants of native growth hormones having non naturally occurring amino acid sequences or covalent modifications

摘要

Growth hormones contain two receptor binding sites termed site 1 and site 2 with which they form ternary complexes with their receptors. In this scheme, site 1 on the hormone binds to one molecule of receptor and then site 2 binds to another molecule of receptor, thereby producing a 1:2 complex. Disclosed herein are growth hormone variants consisting of modifications to the native sequence in the region of site 1 or site 2, or alternatively a combination of modifications at both site 1 and site 2.