THE STRUCTURE OF CRYSTALLINE PROFILIN-BETA-ACTIN

RESIDUE ACE A IS THE N-ACETYL MOIETY OF ACTIN.

RESIDUE ACE P IS THE N-ACETYL MOIETY OF PROFILIN.

RESIDUE P 73 IS A BETA-BULGE, REDIRECTING STRAND 6.

Structural Aspects of Actin Binding Proteins Current Opinion in Cell Biology

Mutagenesis of Human Profilin Locates its Poly(L-Proline)-Binding Site to a Hydrophobic Patch of Aromatic Amino Acids

Molecular Packing in Profilin-Actin Crystals and its Implications

(ACE)DDDIAALVVDNGSGMCKAGFAGDDAPRAVFPSIVGRPRHQGVMVGMGQKDSYVGDEAQSKRGILTLKYPIE
(HIC)GIVTNWDDMEKIWHHTFYNELRVAPEEHPVLLTEAPLNPKANREKMTQIMFETFNTPAMYVAIQAVLSLYASGRT
TGIVMDSGDGVTHTVPIYEGYALPHAILRLDLAGRDLTDYLMKILTERGYSFTTTAEREIVRDIKEKLCYVALDFEQEMA
TAASSSSLEKSYELPDGQVITIGNERFRCPEALFQPSFLGMESCGIHETTFNSIMKCDVDIRKDLYANTVLSGGTTMYPG
IADRMQKEITALAPSTMKIKIIAPPERKYSVWIGGSILASLSTFQQMWISKQEYDESGPSIVHRKCF

XDDDIAALVVDNGSGMCKAGFAGDDAPRAVFPSIVGRPRHQGVMVGMGQKDSYVGDEAQSKRGILTLKYPIEHGIVTNWD
DMEKIWHHTFYNELRVAPEEHPVLLTEAPLNPKANREKMTQIMFETFNTPAMYVAIQAVLSLYASGRTTGIVMDSGDGVT
HTVPIYEGYALPHAILRLDLAGRDLTDYLMKILTERGYSFTTTAEREIVRDIKEKLCYVALDFEQEMATAASSSSLEKSY
ELPDGQVITIGNERFRCPEALFQPSFLGMESCGIHETTFNSIMKCDVDIRKDLYANTVLSGGTTMYPGIADRMQKEITAL
APSTMKIKIIAPPERKYSVWIGGSILASLSTFQQMWISKQEYDESGPSIVHRKCF

(ACE)AGWNAYIDNLMADGTCQDAAIVGYKDSPSVWAAVPGKTFVNITPAEVGILVGKDRSSFFVNGLTLGGQKCSVIRD
SLLQDGEFTMDLRTKSTGGAPTFNITVTMTAKTLVLLMGKEGVHGGMINKKCYEMASHLRRSQY

XAGWNAYIDNLMADGTCQDAAIVGYKDSPSVWAAVPGKTFVNITPAEVGILVGKDRSSFFVNGLTLGGQKCSVIRDSLLQ
DGEFTMDLRTKSTGGAPTFNITVTMTAKTLVLLMGKEGVHGGMINKKCYEMASHLRRSQY

HELIX
RESIDUES ARE INCLUDED AT THE BEGINNING OF HELICES IF THEY
PARTICIPATE IN HYDROGEN BONDING AND ARE "PARTIALLY"
HELICAL, EVEN IF THE ENTIRE RESIDUE DOES NOT FIT HELICAL
CRITERIA.

SHEET
PROFILIN IS DESCRIBED IN JRNL REFERENCE AS HAVING A
SIX-MEMBERED BETA-SHEET WHICH SHARES A STRAND WITH A SECOND
TWO-MEMBERED SHEET. TO CONFORM WITH PROTEIN DATA BANK
GUIDELINES, THESE SHEETS ARE COMBINED INTO A SINGLE
SEVEN-MEMBERED SHEET (SP1) IN THIS ENTRY. STRAND NUMBERING
ALSO DIFFERS FROM THE JRNL REFERENCE.
SECONDARY STRUCTURE ASSIGNMENTS FOR BETA-ACTIN ARE SIMILAR
TO THOSE USED FOR ALPHA-ACTIN (PROTEIN DATA BANK ENTRY
1ATN) WITH MINOR CHANGES. HOWEVER, THE NOMENCLATURE USED
HEREIN DIFFERS FROM THAT USED IN THE ABOVE ENTRY. ALSO,
STRAND A4B DESCRIBED IN THAT ENTRY IS NOT INCLUDED HERE
BECAUSE THE "ALTERNATIVE" STRAND TO ONE IN STRAND A4A
(CORRESPONDING TO SA4 IN THIS ENTRY) IS ONLY TWO RESIDUES
IN LENGTH.
IN CONTRAST, SHEET SA3 IS INCLUDED BECAUSE IT CONTAINS TWO
STRANDS AND A WELL-DEFINED TYPE II TURN, EVEN THOUGH THE
TWO STRANDS CONTAIN ONLY TWO RESIDUES EACH.
RESIDUE P 31 IS A BETA-BULGE.
RESIDUE P 73 IS A BETA-BULGE, REDIRECTING STRAND 6.