Abstract: The invention relates to an isolated non-naturally occurring protein comprising the amino acid sequence as set forth in SEQ ID NO: 1, and wherein the amino acid in position 8, 47, 209 and/or 354 is substituted by any amino acid different from the amino acid indicated at that position in said sequence SEQ ID NO: 1.

Abstract: The present invention relates to a mutant polypeptide comprising the amino acid sequence of the ectodomain of glycoprotein G of a vesicular stomatitis vims (VSV) strain, wherein said ectodomain comprises the amino acid sequence as set forth in SEQ ID NO: 2 or a sequence having at least 50% of identity with the amino acid sequence as set forth in SEQ ID NO: 2, with at least one substitution of an amino acid residue selected from the group consisting of: a) any amino acid residue located from position 421 to position 429 and any amino acid residue located from position 17 to position 25 of SEQ ID NO:2; or b) any amino acid residue located from a position equivalent to position 421 to a position equivalent to position 429 of SEQ ID NO: 2 and any amino acid residue located from a position equivalent to position 17 to a position equivalent to position 25 of SEQ ID NO: 2, after optimal global alignment with SEQ ID NO:2.

Abstract: The invention relates to an isolated non-naturally occurring protein comprising the amino acid sequence as set forth in SEQ ID NO: 1, and wherein the amino acid in position 8, 47, 209 and/or 354 is substituted by any amino acid different from the amino acid indicated at that position in said sequence SEQ ID NO: 1.