acetyl-CoA + D-glucosamine 6-phosphate = CoA + H(+) + N-acetyl-D-glucosamine 6-phosphate Nucleotide-sugar biosynthesis; UDP-N-acetyl-alpha-D-glucosamine biosynthesis; N-acetyl-alpha-D-glucosamine 1-phosphate from alpha-D-glucosamine 6-phosphate (route I): step 1/2. Belongs to the acetyltransferase family. GNA1 subfamily.