In human pyruvate can not converted into phosphoenolpyruvate i.e, it's a irreversible step But in c4 plants how pyruvate is converted into phosphoenolpyruvate?
This is likely an overly simplistic answer, but plants have a gene encoding pyruvate-phosphate dikinase, which converts pyruvate to phosphoenolpyruvate. Since there is no gene in humans encoding pyruvate-phosphate dikinase we cannot convert pyruvate to phosphoenolpyruvate. In addition, the whole C4 pathway relies on a specialized compartmentalization, which never developed in human (or C3 plants for that matter).
Thank u sir ur answer very useful to me