6xdk is a 4 chain structure with sequence from Stenotrophomonas maltophilia K279a. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
SERC_STRMK Catalyzes the reversible conversion of 3-phosphohydroxypyruvate to phosphoserine and of 3-hydroxy-2-oxo-4-phosphonooxybutanoate to phosphohydroxythreonine.[HAMAP-Rule:MF_00160]