They do not belong to glycosyl hydrolases anymore. They have been reclassified within the AA families in CAZy (AA9). It has been shown that they are copper monooxygenases that cleave polysaccharides through an oxidative mechanism.
Hi Sushil. There are quite a few publications on LPMOs that can be found by google search. I would recommend Levasser et al paper from 2013 (in open access journal):