I'm a master student in USM , Malaysia. I'm doing on project about molecule quercetin bind with macromolecule of enzyme cancer. I check on the binding affinity of molecule flavonoids to enzyme cancer. I find HETATM in my Protein Data Bank file. But, I don't know what is the meaning of HETATM file. May I know the answer of below question ?

1. What are HETATM ? What are they mean ?

2. What are the meaning of the fourth and fifth row value in Protein Data Bank file? Please refer to attached file. Thanks.

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Attachment: HETATM Que.doc
Description: HETATM Que.doc