This invention relates generally to nucleic acid sequences encoding proteins that are related to the presence of seed storage compounds in plants. More specifically, the present invention relates to KCS-like nucleic acid sequences encoding lipid metabolism proteins (LMP) and the use of these sequences in transgenic plants. In particular, the invention is directed to methods for manipulating fatty acid-related compounds and for increasing oil level and altering the fatty acid composition in plants and seeds. The invention further relates to methods of using these novel plant polypeptides to stimulate plant growth and/or to increase yield and/or composition of seed storage compounds.