Protein has dextransucrase activity and applications

The invention relates to a protein to dextransucrase activity whose amino acid sequence SEQ ID NO: 1, a protein to dextransucrase activity whose amino acid sequence SEQ ID NO: 2, a complex comprising a carrier and a protein to dextransucrase activity, dextrans synthesis method, and dextrans. The invention also relates to a gluco-oligosaccharides synthesis process and gluco-conjugates, and the products obtained.