Dear colleagues,

I am refining one structure at 1.94 A with phenix.refine with individual b, TLS, and xyz. The Rwork and Rfree are now at 16.1 and 19.8%. But when inspecting the maps, I noticed that the sidechain tip of some residues showed positive density and the b-factor for those atoms were very high while those for the other atoms of the same residues were normal; The b-factors for newly added ligands were also not refined well showing high b-value and positive density at the same time; the disulfide bonds also show positive density and high B. The occupancy were all set to 1.

Please give suggestions. Thanks!

Best regards,

Tongqing

Tongqing Zhou, Ph.D.

Staff Scientist

Structural Biology Section

Vaccine Research Center, NIAID/NIH

Building 40, Room 4609B

40 Convent Drive, MSC3027

Bethesda, MD 20892

(301) 594-8710 (Tel)

(301) 793-0794 (Cell)

(301) 480-2658 (Fax)

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