GDP-alpha-D-glucose + phosphate = alpha-D-glucose 1-phosphate + GDP + H(+)
gdp-alpha-d-glucose + phosphate = alpha-d-glucose 1-phosphate + gdp + h(+)
GDP-alpha-D-glucose + phosphate = alpha-D-glucose 1-phosphate + GDP + H(+)
gdp-alpha-d-glucose + phosphate = alpha-d-glucose 1-phosphate + gdp + h(+)